Calculator Tools
Reliable calculators for math, finance, health, and engineering. Get instant, accurate results with clean UI and zero distractions.
AI Tools 1
Prompt Token Budget Planner
Estimate token usage for Claude, GPT, Gemini, Llama and split long prompts into model-safe chunks with overlap. Free, offline, no API key needed.
Audio Tools 1
Note Frequency
Instrument tuner reference: convert notes to Hz with cents deviation, MIDI numbers, overtone/harmonic series, interactive piano. A=432/440/415 presets.
Blockchain Tools 6
DCA Calculator
Simulate Dollar Cost Averaging for crypto investments. Compare DCA vs lump sum strategy with charts, average cost, ROI, and detailed schedule.
Crypto Profit/Loss Calculator
Calculate crypto trading profit, loss, and ROI instantly. Include buy/sell fees, break-even price, and net returns for any cryptocurrency trade.
Impermanent Loss Calculator
Calculate impermanent loss for Uniswap V2 V3 and Balancer liquidity pools. Compare HODL vs LP returns, weighted pools 80/20 supported. Free, instant.
Bitcoin Unit Converter
Convert Bitcoin units instantly: BTC, satoshi, mBTC, bits and more. Free online converter with fiat currency support and precise calculations.
Staking Rewards Calculator
Calculate ETH staking rewards with live APY from Lido, Rocket Pool, Ether.fi, Aave V3. Daily, weekly, monthly, yearly returns + compounding.
Ethereum Unit Converter
Convert between Wei, Gwei, Ether, Szabo, Finney and all EVM units precisely. Calculate gas costs from transaction parameters. Free dev tool, instant.
Calculators 132
Engineering Calculators 39
Resistor Color Code
Decode 4, 5, 6 band resistor colors to ohm value and tolerance, reverse-lookup E12/E24/E48/E96 parts, and check power rating, max current and voltage.
ADA ramp calculator
Wheelchair ramp calculator for 2010 ADA Standards & IBC/A117.1: slope percent, length, landings, handrail length, and 1:8/1:10 alteration compliance.
Area calculator
Area & square footage calculator for rectangle, circle, triangle and more. Add a waste factor and unit price to estimate material quantity and total cost.
Asphalt calculator
Asphalt calculator for driveways, roads and parking lots: estimate hot mix tonnage, cubic yards, metric tonnes, aggregate base and total cost by area and thickness.
BTU calculator
Free air conditioner size calculator: find how many BTU you need by room size, then convert BTU to tons & kW with cooling/heating modes.
Beam load calculator
Compute maximum deflection, bending moment and shear force for simply supported and cantilever beams under point or distributed loads. Free for engineers.
Blueprint measurer
Blueprint measurement tool — upload architectural drawings, calibrate with a known dimension, then measure any distance on floor plans and elevations.
Brick calculator
Free brick calculator: bricks per m2, mortar bags and waste for any wall. Deducts door and window openings for an accurate brickwork estimate.
CFM calculator
ASHRAE 62.1 CFM calculator for HVAC fan & duct sizing. Compute air flow from room size, air changes, or BTU load with altitude density correction & L/s output.
Concrete calculator
Concrete calculator for slabs, columns, footings, curb and stairs. Get cubic yards, m3, 60/80 lb bag counts and the M20 mix ratio take-off.
Drywall calculator
Drywall calculator: estimate 4x8/4x10/4x12 sheets, sheet weight, screws, tape and compound for walls and ceilings, with 5/8" Type X fire-rated guidance.
Duct & pipe pressure calculator
ASHRAE Darcy-Weisbach pressure drop calculator for HVAC ducts and water pipes. Friction and fitting K-factor losses, equivalent diameter, velocity check.
Duct size calculator
Duct size calculator for HVAC: get round or rectangular dimensions, equivalent round diameter, friction loss per 100 ft, and an ASHRAE velocity check.
FAR & lot coverage calculator
Calculate Floor Area Ratio (FAR/FSI/FSR), chargeable buildable area, lot coverage and minimum open space for zoning compliance. For architects and planners.
Flow rate calculator
Flow rate and pipe sizing calculator for volumetric flow, velocity and pipe area. Convert m³/h, L/min, GPM, CFM and check velocity against code limits.
Gear ratio calculator
Free gear ratio calculator: output RPM, torque multiplication, compound trains, plus AGMA service factor and gearbox sizing for motor reduction drives.
Grade calculator
Grade calculator with slope ratio (V:H) and code-compliance pass/fail. Compute grade percent, angle and ratio against ADA, AASHTO and drainage limits.
Gravel calculator
Free gravel calculator: find how much gravel you need for a driveway or path in cubic yards, tons and bags, plus the total cost with a waste/compaction margin.
Insulation calculator
Estimate insulation needed for walls, attics and ceilings. Calculate area, R-value, thickness and ballpark material cost for fiberglass, foam or cellulose.
Material weight calculator
Material weight calculator for steel, aluminum, copper and metal. Get total weight plus weight per meter and per foot for plates, bars, tubes and pipe.
Mulch calculator
Mulch calculator for landscaping: volume for rectangular, circular and triangular beds in yd³, ft³, m³, plus bags-vs-bulk cost and waste overage.
Occupant load calculator
Calculate occupant load and IBC 2021 egress: occupancy load factor, exits, stairway width, travel distance. Verify your design and Certificate of Occupancy.
Paint calculator
Paint calculator with spread rate, two coats and textured-surface presets. Estimate liters & gallons and the real quantity to order, not just sq ft per gallon.
Parking calculator
Parking ratio calculator: required spaces by building type, editable ITE/zoning ratio, ADA & van accessible spaces, and parking lot area estimator.
Pipe volume calculator
Pipe volume calculator: internal volume from inner diameter and length in liters/gallons, plus pipe weight per meter (empty + water-filled) for steel, PVC, copper.
Pressure drop calculator
Pressure drop calculator for pipes and ducts. Compute pressure loss for water, air and gas with Darcy-Weisbach — for HVAC, plumbing and fluid mechanics.
Psychrometric calculator
Compute dew point, wet bulb, humidity ratio, enthalpy and specific volume of moist air with altitude correction, plus an ASHRAE 55 comfort check.
Pulley & belt calculator
Calculate pulley speed ratio, output RPM, belt length, wrap angle and belt speed for V-belt and flat-belt drives, with a 120-degree wrap check.
Rebar calculator
Calculate rebar quantity, length and weight for concrete slabs, then verify the steel-to-concrete ratio (kg/m³) against ACI/EC2 benchmark ranges. Free.
Refrigerant charge calculator
Estimate HVAC/AC refrigerant charge by capacity, line set length and pipe diameter, with A2L charge-limit check. R-410A, R-32, R-454B, R-22, R-134a, R-404A.
Refrigeration capacity calculator
Size walk-in cold rooms and freezers fast: get the heat load in BTU/hr, tons and kW with full transmission, product, latent and infiltration breakdown.
Roofing calculator
Roofing calculator: estimate roof area by pitch or angle, shingle bundles, metal panels, underlayment, ridge cap and drip edge for a pro takeoff.
Scale converter
Free scale converter for drawings, models and maps. Convert metric, imperial (1:48) and ISO 5455 engineering scales, plus check A1/A3 paper fit.
Slope calculator
Slope calculator for rise over run: percent grade, angle in degrees, ratio and length. Checks ADA ramp, roof pitch X:12, driveway and pipe-fall code limits.
Square footage calculator
Square footage calculator for flooring, tile, paint and drywall. Get area in m², ft², yd², in², cm², plus waste factor, units needed and total cost.
Stair calculator
Stair calculator with IRC/IBC code pass-fail checks. Get riser count, rise, run, stringer length, pitch angle and headroom compliance for safe stair design.
Tile calculator
Tile calculator for floors and walls: estimate tiles, full boxes, thinset adhesive bags, grout bags and cost by square footage or room size, with waste.
Torque calculator
Torque calculator with bolt torque mode: reverse-solve force or lever arm, and get bolt clamp load (preload) from T = K × D × F. N·m, lb·ft, kN.
Volume calculator
Volume calculator for sphere, cone, cube, cylinder, tank, capsule, pyramid and ellipsoid. Converts m³/L/gal/ft³ and shows fill weight by density.
Financial Calculators 22
GPA Calculator
Calculate your GPA in 4.0 (US), 10.0 (Vietnam/EU) or 100-point (China/Korea) scales. Credit-weighted, Latin honors, plus true cumulative GPA carry-over.
Break-even calculator
Free break-even calculator: break-even point in units and sales, contribution margin, target profit, margin of safety and operating leverage with a chart.
Compound interest calculator
Calculate compound interest with daily to annual compounding, regular contributions, annual escalation, APY and inflation-adjusted real value.
Discount calculator
See sale price, the amount and percent you save, tax applied after the discount, and a margin guard that flags if a promo drops below cost. Free and fast.
EMI calculator
Free EMI calculator for home, car & personal loans: monthly installment, total interest, reducing-balance amortization plus extra-payment prepayment savings.
EV Charging Cost
Calculate the cost to charge an electric car at home vs public DC fast charging. Cost per kWh and per mile, EV vs gas savings, plus annual and monthly cost.
Effective interest rate calculator
Convert nominal rate (APR) to effective annual rate (EAR/APY) for any compounding, or convert APY back to the required nominal rate. Compare loans and savings.
FIRE Number Calculator
FIRE number calculator: find how much you need to retire early, your years to FIRE from your savings rate, Coast FIRE, 25x rule and SWR bands.
Fuel cost calculator
Calculate trip fuel cost in km or miles with L/100km, MPG or km/L. Get cost per mile/km plus daily, weekly, monthly and yearly commute or fleet budgets.
GST calculator
Add or remove GST from inclusive or exclusive prices: Australia 10%, Canada 5%, India, NZ 15%, Singapore 9%. Totals reconcile to the cent for BAS and invoices.
Import Duty Calculator
Estimate import duty, VAT and landed cost by HS code, Incoterm (CIF/FOB) and destination. Free Section 321 de minimis checker with broker checklist.
Inflation calculator
Project how inflation erodes purchasing power over time, then check if a return beats inflation with a real rate of return calculator. Multi-currency.
Loan calculator
Calculate loan payments, total interest and a full amortization schedule with extra payments and APR/APY. Export the dated schedule to CSV.
Mortgage calculator
Calculate monthly mortgage payment with full PITI breakdown, amortization, auto PMI, property tax, insurance, HOA, and refinance break-even. Free and fast.
Profit margin calculator
Profit margin calculator for gross, operating, EBIT and true net margin with interest and tax inputs. Find price from target margin and markup vs margin.
ROI calculator
Free ROI calculator for return on investment, annualized return, payback period, real inflation-adjusted ROI, and a hurdle-rate accept/reject check.
Salary tax calculator
Free salary tax calculator: convert gross to net pay (or net to gross), with income tax, capped insurance, bonus, and effective-rate breakdown.
Savings goal calculator
Find how much to save monthly to hit your goal, with compound interest, future value, and inflation-adjusted (today's dollars) targets.
Simple interest calculator
Compute simple interest with I=P×R×T, or solve backward for the rate, principal, or time. Get interest and total amount instantly. Free online calculator.
Stablecoin Yield Comparator
Compare stablecoin APY from Aave, Compound, Sky, Ethena, Pendle and Coinbase side by side. Risk-adjusted ranking, fees, inflation and basis-point gaps.
Tip calculator
Calculate tip and split the bill per person in any currency. Round each share to clean cash, see the effective tip %, and tipping by country.
VAT calculator
Add or remove VAT, extract VAT from inclusive prices, and total Net, VAT and Gross across multiple lines. Preset 2026 rates for the UK, EU and 37 countries.
Health & Fitness 27
Child feeding calculator
Calculate infant formula and breast milk intake by age and weight, with ml per kg per day and calorie intake (kcal/kg/day) for clinical adequacy checks.
Coffee Brew
Calculate coffee-to-water ratio for V60, AeroPress, Chemex, French press, espresso, Moka pot, cold brew. Pour schedule, grind, temp, plus SCA Golden Cup TDS.
Feels Like Temperature
Calculate feels-like temperature with wind chill, heat index, dew point, WBGT wet bulb globe temperature and OSHA/ACGIH heat-stress work-rest guidance.
Running Pace
Calculate running pace, time or distance for 5K, 10K, half, marathon. Negative-split pacing plan, splits table, Riegel predictor, min/km to mph converter.
1RM calculator
Estimate your one rep max (1RM) with Epley, Brzycki and 5 more formulas, plus RPE correction and training weights for strength and hypertrophy.
BMI calculator
Find your BMI and the target healthy weight range for your height, with WHO & Asian (2004) cutoffs and waist-to-height ratio for visceral fat risk.
BMR calculator
Free BMR & TDEE calculator with Mifflin-St Jeor, Katch-McArdle and more. Get goal-based calorie targets and a protein floor in calories or kJ, metric/imperial.
BSA calculator
Compare 7 body surface area formulas (Du Bois, Mosteller, Haycock, Gehan & George, Boyd) and convert a mg/m² dose to a total dose for chemotherapy and pediatric dosing.
Baby percentile
WHO baby percentile calculator with real z-scores and SD screening. Get length, weight and head circumference percentiles for infants 0-36 months, corrected age ready.
Body fat calculator
Free body fat calculator using the U.S. Navy method. Get body fat percentage, fat mass, lean mass, ideal target by age and waist-to-height ratio risk.
Body type calculator
Free body shape calculator for women. Find your shape (hourglass, pear, rectangle, inverted triangle, triangle), with waist-hip ratio and styling tips.
Calorie calculator
Free calorie calculator: get your BMR, TDEE, daily macro split, and goal-based deficit or surplus for weight loss, gain, or maintenance.
Child BMI percentile
Free child BMI percentile and BMI z-score calculator using the CDC LMS BMI-for-age method. Get BMI, percentile, SD score, weight category and healthy range for ages 2-20.
Child calorie calculator
Child calorie calculator with Schofield BMR, TDEE and an IOM/DRI EER cross-check. Get recommended calories and macros for kids 1-18 in kg or lbs.
Cut & Bulk Macro Planner
Plan cut, maintenance and bulk phases. Mifflin-St Jeor TDEE, protein-first macros, 3-6 meal splits and training-day carb cycling. Free, metric and imperial.
Fasting Timer
Free intermittent fasting timer for 16:8, 18:6, 20:4, OMAD and custom protocols. Live countdown, eating window calculator (when can I eat next), autophagy stages.
Healthy weight calculator
Find your healthy weight range from height, weight and BMI, plus an optional waist-to-height ratio (WHtR) for central-fat risk. Free, instant, no signup.
Ideal weight calculator
Ideal body weight calculator with Robinson, Miller, Devine and Hamwi formulas, BMI category and adjusted body weight (ABW) for medication dosing, metric and imperial.
Lean body mass calculator
Lean body mass calculator with Boer, James & Hume formulas plus FFMI classification. Estimate LBM for clinical drug dosing, BMR and protein targets.
Macro calculator
Free IIFYM macro calculator: set protein by grams per kg or % of calories, then get carb and fat targets from your BMR and TDEE for cutting, bulking or keto.
Ovulation calculator
Find your ovulation date and most fertile days, including irregular cycles, plus an estimated due date. Free fertility calendar with luteal phase tracking.
Pregnancy due date calculator
Calculate your pregnancy due date from LMP, conception, or ultrasound. Free EDD calculator with trimester tracking and ACOG term-window dates.
Sleep cycle calculator
Calculate the best time to wake up or go to sleep based on sleep cycles. Free sleep calculator to help you wake up refreshed during light sleep phases.
TDEE calculator
Calculate TDEE and BMR with the Mifflin-St Jeor formula, then get protein, carb, and fat macros for cutting, bulking, or maintenance calorie targets.
Target heart rate calculator
Karvonen heart rate zone calculator using HRR. Find Zone 2, fat-burn, cardio and threshold targets with Standard, Tanaka and Gulati max-HR formulas.
WHO growth chart
Free WHO growth chart calculator for children 0-19. Get length/height-for-age, weight-for-age and BMI-for-age percentiles, Z-scores and WHO classifications.
Water intake calculator
Calculate daily water intake by weight (kg/lb), activity and climate. Get liters, fl oz and cups, with pregnancy and breastfeeding adjustments.
HVAC Calculators 6
HDD & CDD Calculator
HDD & CDD calculator with base 65F/18C, 1991-2020 climate normals, IECC zone, plus building energy & fuel-cost estimate for ASHRAE 90.1 work.
U-value & R-value Converter
Convert U-value (thermal transmittance) and R-value, build multi-layer wall assemblies, add air films, and check IECC climate-zone code compliance.
Ventilation Calculator
Calculate ASHRAE 62.1 outdoor air from Rp and Ra in CFM and L/s, then run a pass/fail check on your design or measured airflow versus the minimum OA.
ACH Calculator
ACH calculator with ASHRAE 62.2 minimum, CFM to ACH conversion, clearance time and annual energy cost for HVAC, cleanroom and isolation design.
Dew Point & RH Calculator
Convert temperature, RH & dew point via Magnus-Tetens. Get wet bulb, humidity ratio, absolute humidity & vapor pressure for HVAC condensation, ASHRAE comfort.
HVAC load calculator
Free HVAC load & BTU calculator: size AC tonnage with Manual J sensible/latent split, solar gain and an ACCA Manual S oversizing compliance check.
Math Calculators 32
Aspect Ratio Calculator
Free aspect ratio calculator. Resize images and videos by ratio, then fit into any frame with exact letterbox bars and an FFmpeg scale+pad command.
Binary calculator
Binary calculator with selectable 8/16/32/64-bit width and signed/unsigned two's complement. Add, subtract, AND, OR, XOR, NOT, shift in any base.
Combinatorics calculator
Combinatorics calculator: permutations & combinations with or without repetition, factorials, n^r, stars and bars, BigInt steps.
Complex number calculator
Add, multiply, divide complex numbers and combine parallel impedances. Rectangular to polar conversion, phasors, De Moivre powers and roots with R + jX steps.
Cosecant calculator
Calculate csc(x) in degrees or radians and solve arccsc(x) for every angle, showing the principal value, the second solution and the general solution.
Cosine calculator
Solve cos(x), arccos(x) and Law of Cosines triangles (SAS/SSS) in degrees or radians. Built for engineering, surveying and physics work.
Cotangent calculator
Cotangent calculator for cot(x), tan, csc and arccot in degrees or radians. Handles asymptotes, reciprocal and Pythagorean identities with worked steps.
Derivative & integral calculator
Differentiate or integrate a function symbolically, then evaluate the result at a point or compute a definite integral over [a, b]. Free, instant, no sign-up.
Exponent calculator
Exponent calculator for a^n: integer, fractional, negative powers, scientific notation. Exact BigInt integers, compound interest, doubling time.
Factor calculator
Free factor calculator: get all factors, factor pairs, prime factorization, divisor count, sum of divisors and perfect/abundant verdict instantly.
Factorial calculator
Exact BigInt factorial calculator for any n. Get the full integer, digit count, trailing zeros (Legendre) and Stirling magnitude, step by step.
Fraction calculator
Free fraction calculator with step-by-step working. Add, subtract, multiply, divide and simplify fractions or mixed numbers, with instant decimal and percent.
GCF calculator
GCF calculator with a step-by-step Euclidean algorithm trace and prime factorization. Find the GCF, GCD or HCF plus LCM for fraction reduction and aspect ratios.
Haversine calculator
Compute great-circle distance and initial bearing between two GPS coordinates with the haversine formula. Choose km, miles, or nautical miles.
Hex calculator
Programmer hex calculator: AND/OR/XOR/NOT, shifts and arithmetic with selectable 8/16/32/64-bit or BigInt width, two's-complement signed output, hex/dec/binary.
LCM calculator
Free LCM calculator with prime-factorization steps. Get the least common multiple plus the GCF — exact BigInt math for fractions, LCD and scheduling.
Ln calculator
Free ln(x) calculator: get natural log plus log10, log2, change of base log_b(x), and the inverse e^x (antilog). Graph included.
Log calculator
Free log calculator for any base — log₂, log₁₀, ln (natural log), custom bases, antilog and inverse log. Solve for base, argument or result with change-of-base.
Matrix calculator
Compute matrix determinant, inverse, eigenvalues, rank, trace, solve Ax=b and the condition number online. Step-by-step linear algebra for students, engineers.
Modular arithmetic calculator
Free modular arithmetic calculator: modulo, modular inverse, modular exponentiation, modular division and a linear congruence solver via extended Euclidean GCD.
Percentage calculator
Free percentage calculator with 6 modes: % of value, % change, increase/decrease, reverse %, discount and CAGR. For taxes, discounts and growth.
Polynomial solver
Find all real and complex roots of any-degree polynomials, plus a stability verdict, natural frequency and damping ratio for characteristic equations.
Quadratic equation solver
Solve ax² + bx + c = 0 with full working: real or complex roots, discriminant Δ, vertex (min/max), axis of symmetry, Vieta's formulas and factored form.
Random number generator
Free online random number generator. Pick a number in any min-max range, draw unique no-repeat samples or lists, with custom step size and delimiters.
Ratio calculator
Ratio calculator and proportion solver. Simplify ratios, convert to percentage and fraction, solve A:B = C:?, and find aspect ratios for mixing and screens.
Root calculator
Free root calculator for square, cube, and nth principal roots. Get exact perfect-power results, simplified surds (√50 = 5√2), and round-trip verification.
Scientific calculator
Free online scientific calculator with a DEG/RAD toggle for trig, log, ln, exp, factorial, parentheses, π and e. PEMDAS-aware and accurate.
Secant calculator
Free online secant calculator: get sec(x) and arcsec(x) in degrees or radians with exact values and steps. Handles asymptotes correctly (sec 90 = undefined).
Sine calculator
Compute sin(x) and arcsin(x) in degrees or radians. Unit-circle explanation, common-angle table, Law of Sines, and step-by-step examples for students and engineers.
Statistics calculator
Compute mean, median, mode, variance, standard deviation, quartiles, IQR and z-scores from any dataset. Toggle sample vs population and read skewness and kurtosis.
Tangent calculator
Compute tan(x) and arctan(x) in degrees, radians or π fractions. Convert slope to angle, grade percent and 1:N ratio, with ADA ramp-limit check.
Versine calculator
Versine calculator for versin(x), inverse versine and the sagitta (mid-ordinate) of a circular-arc curve radius. For survey, rail/road and optics layout.
Wire Calculators 6
AWG to mm converter
Convert AWG wire gauge to mm and mm2 cross-section, with kcmil, nearest IEC 60228 size, NEC ampacity and copper resistance for wire sizing.
Three-phase voltage drop
Three-phase voltage drop calculator with operating-temperature correction and a NEC 3%/5% or IEC pass/fail check for Delta and Wye feeders, copper or aluminum.
Voltage drop calculator
Voltage drop calculator with NEC 3%/5% and IEC pass/fail check. Get the minimum compliant AWG for DC, single- and three-phase runs in copper or aluminum.
Wire ampacity estimator
Estimate wire ampacity with derating factors for temperature and conduit fill. Reference tool based on NEC guidelines. Always consult local electrical codes.
Wire gauge calculator
Free AWG wire gauge calculator: diameter, cross-section area, resistance, plus built-in NEC ampacity and 3% voltage-drop check for copper and aluminum.
Wire resistance calculator
Wire resistance & voltage drop calculator with NEC 3%/5% check. AWG/mm/inch, °C/°F, 6 metals, temperature compensation and I²R power loss.
Color Tools 1
Clamp() Calculator
Free CSS clamp() calculator for fluid typography with rem/px output, CSS custom properties and Utopia-style type scales. Live preview plus a WCAG 1.4.4 zoom-safe check.
Developer Tools 2
Utilities 2
CSS Specificity
Compute CSS specificity for any selector with a color-coded breakdown, multi-selector comparison, and a source-order tiebreaker for specificity ties.
Subnet Calculator
Free IPv4 subnet calculator with CIDR to subnet mask, Cisco wildcard mask, VLSM splitting, binary view, and reverse host sizing (pick the prefix for N hosts).
Fun Tools 1
Pet Age Calculator
Free pet age calculator. Convert dog age, cat age, rabbit age, horse age to human years. Science-based (Wang 2019 epigenetic clock, AAHA, AAFP).
Geography & Mapping Tools 7
Area & Perimeter
Geodesic polygon area calculator: WGS84 lat/lon or planar survey X/Y. Land parcel area, perimeter, Shoelace centroid in hectares, acres, m².
Route Distance
Free route distance calculator: great-circle (Haversine) distance and initial bearing for multi-point GPS routes. Get km, miles, and nautical miles per segment.
Polygon Calculator
Free GIS polygon area calculator: geodesic area, perimeter, centroid and edge bearings from GeoJSON/WKT or map drawing on WGS84 (EPSG:4326) lat/lon.
UTM / MGRS Converter
Free WGS84 UTM MGRS converter: lat long to UTM, MGRS at 1 m precision and 6/8/10-digit NATO grid reference. Batch CSV conversion for surveyors.
Distance & Bearing
Great-circle distance, forward/back bearing, midpoint and destination point between GPS coordinates. Results in km, miles and nautical miles. WGS84 ready.
Coordinate Converter
Free WGS84 GPS coordinate converter: instantly switch DD, DMS, DDM, UTM and MGRS. Bulk paste, use my location, export CSV, KML, GPX and GeoJSON.
Carbon Footprint Calculator
Free carbon footprint calculator for your household. Track CO2 emissions per year from transport, flights, home energy, diet & shopping, plus offset cost.
Hardware Tools 1
Input Devices 1
CPS Test
Test your clicking speed with our CPS (Clicks Per Second) tester. Perfect for gamers to measure mouse click speed in Minecraft, FPS games, and more.
Social Media Tools 3
Engagement Rate Calculator
Calculate Instagram, TikTok, YouTube, X engagement rate per post and per follower. Industry benchmarks, ER formulas, micro vs mega influencer rates.
TikTok Money Calculator
Calculate TikTok earnings with 2026 Creativity Program vs legacy Creator Fund toggle. Estimate sponsorships, RPM by niche & region, brand-deal value.
YouTube Money Calculator
Calculate YouTube earnings with 10 niche CPM multipliers + revenue-stream split (Ads, Memberships, Super Thanks, Shorts). 2026 Partner Program rates.
Time Tools 17
Lunar Calendar
Convert solar to lunar dates both ways. Shows zodiac, stem-branch, leap month, 24 solar terms, Chinese New Year date. Chinese & Vietnamese, 1900-2100.
Work Shift Scheduler
Free shift scheduler and rota maker. Build rotating employee rosters, check weekly hours and rest periods for labor compliance, and export CSV or ICS.
Equinox & Solstice
Find exact UTC dates and times of equinoxes and solstices from 1800 to 2200, convert to your timezone, and export an .ics calendar file for any year range.
Daylight Duration
Calculate daylight hours, sunrise, sunset, solar noon and civil, nautical, astronomical twilight plus golden hour for any coordinates and date.
Season Calendar
Find the exact UTC date and time of every equinox and solstice for any year 1900-2100, plus season start and end dates for both hemispheres.
Sun Path
Plot the sun path diagram, golden hour, solar altitude and azimuth for any date. Get peak noon altitude, shadow ratio and panel tilt for solar and photo work.
Sunrise Sunset
Free sunrise sunset calculator with golden hour, blue hour, day length and solar noon. NOAA solar algorithm for photographers, drone pilots and solar planners.
Moon Phase Calendar
Free moon phase calendar with illumination percentage. Generate a monthly or yearly lunar calendar from 1900 to 2100, print or download as PDF.
Age calculator
Calculate exact age in years, months, days, hours, seconds. Shows zodiac, day of week born, life milestones (10k days), and life expectancy comparison.
Audiobook Speed Calculator
See remaining listening time at 1×–3×, the daily minutes and player speed you need, and the calendar date you finish an audiobook or podcast by your deadline.
Birthday calculator
Count the exact days, weeks, and months until your next birthday, see the weekday and age you turn, and export it to your calendar as a yearly reminder.
Date Difference Calculator
Days, weeks, months and years between any two dates. Business days, leap-year aware, DST safe, ISO 8601 dates. For age, contracts, project planning.
Pomodoro Timer
Free Pomodoro timer with ambient sounds, session timeline, and CSV export. 25-min focus sessions for deep work, time tracking, and ADHD focus.
Sleep Cycle Calculator
Find the best bedtime (or wake time) using 90-minute REM/NREM cycles. Adds sleep-onset latency. Shows 6, 5, 4, 3-cycle options + sleep stages breakdown.
Time Add Subtract Calculator
Add or subtract years, months, days, hours, minutes and seconds from any date. Calendar-aware with overflow rollover, a business-days mode and ISO 8601 output.
Time Interval Splitter
Split time ranges into equal intervals with buffer breaks between slots. Build appointment slots, shift schedules, and Pomodoro blocks with a visual timeline.
Working Days Calculator
Count net working days between two dates or add/subtract business days, excluding weekends and holidays. Custom workweek (Mon-Fri, Fri-Sat, 6-day) for global pros.
Video Tools 2
Bitrate Calculator
Compute video bitrate or file size from duration. Built-in recommendations for H.264, H.265, AV1 and 1080p/4K/8K. Plan YouTube, Twitch, archives without guesswork.
Video Upload Time
Estimate how long to upload a video to YouTube, Vimeo, TikTok, Drive or S3. Inputs: file size, upload speed in Mbps. Output: realistic minutes with overhead.
