Calculator Tools
Reliable calculators for math, finance, health, and engineering. Get instant, accurate results with clean UI and zero distractions.
Blockchain Tools 2
Bitcoin Unit Converter
Convert Bitcoin units instantly: BTC, satoshi, mBTC, bits and more. Free online converter with fiat currency support and precise calculations.
Ethereum Unit Converter
Convert Ethereum units instantly: Wei, Gwei, Ether and more. Free online converter for EVM units with precise calculations for gas prices.
Calculators 116
Engineering Calculators 32
Area calculator
Free online area calculator for rectangle, triangle, circle, trapezoid, ellipse, sector, and parallelogram. Calculate surface area with step-by-step formulas for geometry and construction.
Asphalt calculator
Free online asphalt calculator to estimate the amount of asphalt needed for driveways, roads, and parking lots. Calculate cubic yards, tons, and cost based on area and thickness.
BTU calculator
Free online BTU calculator for air conditioning and heating. Calculate BTU requirements based on room size, insulation, climate, and occupancy. Determine the right AC or heater capacity in BTU, tons, and kW.
Beam load calculator
Free online beam load calculator for structural engineering. Calculate maximum deflection, bending moment, and shear force for simply supported and cantilever beams with point loads and distributed loads. Essential tool for engineers and designers.
Brick calculator
Free online brick calculator for construction. Calculate number of bricks and mortar needed for walls. Supports standard, modular, queen, and king brick sizes with mortar joints and waste percentage.
CFM calculator
Free online CFM (Cubic Feet per Minute) calculator for HVAC, ventilation, and air flow calculations. Calculate required air flow based on room size, air changes, or cooling/heating load.
Concrete calculator
Free online concrete calculator for slabs, columns, footings, and tubes. Calculate concrete volume in cubic meters, cubic yards, and cubic feet. Estimate weight and material needed for construction projects.
Drywall calculator
Free online drywall calculator to estimate the number of drywall sheets, screws, joint compound, and tape needed for walls and ceilings. Calculate based on room dimensions with waste factor included.
Duct pressure calculator
Free online duct pressure calculator for HVAC systems. Calculate static pressure drop, friction loss, and velocity pressure in air ducts based on CFM, duct size, and length.
Duct size calculator
Free online duct size calculator for HVAC systems. Calculate rectangular or round duct dimensions based on CFM and velocity. Essential for air conditioning and ventilation design.
Flow rate calculator
Free online flow rate calculator to calculate volumetric flow rate, velocity, and pipe area. Convert between m³/h, L/min, GPM, and CFM. Essential for plumbing, HVAC, and fluid systems.
Gear ratio calculator
Free online gear ratio calculator to calculate speed ratios, RPM, torque multiplication, and gear teeth for mechanical design. Essential tool for automotive, robotics, and mechanical engineering.
Grade calculator
Free online grade calculator for land grading, site work, and elevation changes. Calculate grade percentage, slope, and elevation differences for drainage, roads, and landscaping projects.
Gravel calculator
Free online gravel calculator to estimate the amount of gravel, stone, or aggregate needed for driveways, paths, and landscaping. Calculate cubic yards, tons, and bags based on area and depth.
Insulation calculator
Free online insulation calculator to estimate the amount of insulation material needed for walls, attics, and ceilings. Calculate based on area, R-value, and insulation type including fiberglass, foam, and cellulose.
Material weight calculator
Free online material weight calculator for steel, aluminum, copper, and other metals. Calculate weight based on dimensions and density for plates, bars, tubes, and sheets.
Mulch calculator
Free online mulch calculator for landscaping projects. Calculate mulch volume needed for rectangular, circular, and triangular garden beds. Determine bags needed and coverage area in cubic yards, cubic feet, and cubic meters.
Paint calculator
Free online paint calculator to estimate the amount of paint needed for walls, rooms, and surfaces. Calculate paint quantity in liters and gallons based on room dimensions, coats, and coverage rate. Perfect for home painting projects.
Pipe volume calculator
Free online pipe volume calculator to calculate internal volume, capacity, and water weight for circular pipes. Calculate based on diameter and length for plumbing and engineering.
Pressure drop calculator
Free online pressure drop calculator for pipes and ducts. Calculate pressure loss for water, air, and gas flow using Darcy-Weisbach equation. Essential for HVAC, plumbing, and fluid mechanics.
Psychrometric calculator
Free online psychrometric calculator for HVAC calculations. Calculate relative humidity, dew point, wet bulb temperature, enthalpy, and other air properties based on dry bulb temperature and humidity.
Pulley & belt calculator
Free online pulley and belt calculator to calculate speed ratio, RPM, belt length, and pulley sizes. Essential tool for mechanical engineering, conveyor systems, and motor drive calculations.
Rebar calculator
Free online rebar calculator to estimate the number of reinforcement bars needed for concrete slabs, beams, and columns. Calculate rebar quantity, length, and weight based on dimensions and spacing.
Refrigerant charge calculator
Free online refrigerant charge calculator for HVAC and air conditioning systems. Estimate the correct amount of refrigerant needed based on system capacity, line set length, and pipe diameter. Supports R-410A, R-32, R-22, and more.
Refrigeration capacity calculator
Free online refrigeration capacity calculator for cold storage, freezers, and cooling systems. Calculate required cooling capacity in BTU/hr, tons, and kW based on heat load and temperature.
Roofing calculator
Free online roofing calculator to estimate roof area and materials needed. Calculate by roof pitch or angle, including eaves overhang. Get estimates for shingles, felt, and roofing materials.
Slope calculator
Free online slope calculator to calculate slope percentage, angle, rise over run for roofs, ramps, stairs, drainage, and roads. Convert between degrees, percent, and ratio formats.
Square footage calculator
Free online square footage calculator for rectangles, circles, triangles, trapezoids, parallelograms, rings, and sectors. Calculate area in square meters, square feet, square inches, and square centimeters.
Stair calculator
Free online stair calculator for construction and renovation. Calculate number of steps, rise, run, total length, and angle. Verify against building codes for safe and comfortable staircase design.
Tile calculator
Free online tile calculator to estimate the number of tiles needed for floor and wall projects. Calculate by area or room dimensions, includes grout spacing and waste percentage. Get accurate tile estimates.
Torque calculator
Free online torque calculator to calculate torque from force and distance. Convert between N·m, lb·ft, and lb·in. Essential tool for mechanical engineering, automotive, and physics calculations.
Volume calculator
Free online volume calculator for sphere, cone, cube, cylinder, rectangular tank, capsule, pyramid, ellipsoid, and more. Calculate volume with step-by-step formulas for geometry and engineering.
Financial Calculators 18
GPA Calculator
Free online GPA calculator for students. Calculate your Grade Point Average using 4.0 or 10.0 scale. Track your academic performance with weighted credit hours.
Break-even calculator
Free online break-even calculator to determine break-even point in units and sales for your business. Calculate contribution margin, target profit units, and visualize break-even analysis with detailed charts.
Compound interest calculator
Free online compound interest calculator. Calculate compound interest with different compounding frequencies (daily, monthly, quarterly, annually). Perfect for investments, savings, and long-term financial planning.
Discount calculator
Free online discount calculator. Calculate final price, discount amount, and savings percentage. Perfect for shopping, sales, promotions, and finding the best deals.
EMI calculator
Free online EMI calculator to calculate equated monthly installment for home loans, car loans, personal loans, and business loans. Calculate monthly payment, total interest, and loan amortization schedule with detailed breakdown.
Effective interest rate calculator
Free online effective interest rate calculator. Calculate effective annual interest rate (EAR) and effective period interest rate from nominal rate and compounding frequency. Perfect for comparing loans and investments.
Fuel cost calculator
Calculate fuel costs for your trip based on distance, fuel consumption (L/100km), and fuel price. Free online fuel cost calculator for accurate travel expense planning.
GST calculator
Free online GST (Goods and Services Tax) calculator. Add or remove GST from any amount. Calculate GST for Australia, Canada, India, Malaysia, New Zealand, Singapore and other countries.
Inflation calculator
Free online inflation calculator to determine the future or past value of money adjusted for inflation. Calculate purchasing power changes, real value of money, and compare values across different time periods with historical inflation rates.
Loan calculator
Free online loan calculator for amortized loans, deferred payment loans, and bonds. Calculate monthly payments, total interest, loan maturity amounts with detailed amortization schedules and charts.
Mortgage calculator
Free online mortgage calculator. Calculate monthly payments, total interest, and total payment for your home loan. Perfect for home buyers, refinancing, and mortgage planning with amortization details.
Profit margin calculator
Free online profit margin calculator to calculate gross profit margin, net profit margin, and markup percentage. Calculate profitability for products, services, and businesses with detailed formulas and examples.
ROI calculator
Free online ROI calculator to calculate return on investment for business projects, marketing campaigns, real estate, stocks, and crypto investments. Calculate ROI percentage, annualized return, and payback period with detailed analysis.
Salary tax calculator
Free online salary tax calculator to compute net salary from gross, income tax, social security, health insurance, and other deductions. Calculate take-home pay with detailed breakdowns and annual summaries.
Savings goal calculator
Free online savings goal calculator to determine how much to save monthly to reach your financial goals. Calculate future value of savings with compound interest. Plan for emergency fund, house down payment, retirement, vacation, and more.
Simple interest calculator
Free online simple interest calculator. Calculate simple interest, principal, rate, time, or total amount. Perfect for loans, savings, and financial planning with step-by-step calculations and formulas.
Tip calculator
Free online tip calculator to calculate tips, tax, and split bills. Calculate tip amounts, total costs, and amount per person for restaurants, services, and more.
VAT calculator
Free online VAT (Value Added Tax) calculator. Add or remove VAT from any amount. Calculate VAT for UK, EU countries, and other nations. Perfect for invoicing, pricing, and tax calculations.
Health & Fitness 22
Child feeding calculator
Calculate recommended infant feeding amounts based on age and weight. Get personalized formula and milk intake guidelines for babies 0-24 months.
Child calorie calculator
Calculate daily calorie needs for children and teens. Determine recommended calories, macros, and nutrition requirements based on age, activity level, and goals.
Baby percentile
Calculate baby growth percentiles for length, weight, and head circumference using WHO standards. Track infant development from 0-36 months.
Child BMI percentile
Calculate BMI percentile for children and teens aged 2-20 years. Determine weight category using CDC growth charts and BMI-for-age standards.
WHO growth chart
Calculate child growth percentiles and Z-scores using WHO growth standards. Track height and weight development for children 0-19 years old.
1RM calculator
Calculate your one rep max (1RM) using multiple formulas including Epley, Brzycki, and more. Get personalized training weights for strength, hypertrophy, and endurance. Free 1RM calculator for weightlifting.
BMI calculator
Calculate your Body Mass Index (BMI) and determine your weight category and health risks. Free online BMI calculator with detailed health risk assessment.
BMR calculator
Calculate your Basal Metabolic Rate (BMR) using multiple formulas including Mifflin-St Jeor, Harris-Benedict, and more. Get accurate TDEE calculations for weight management.
BSA calculator
Calculate Body Surface Area (BSA) using multiple medical formulas including Du Bois, Mosteller, and Haycock. Free BSA calculator for accurate medical dosing and assessment.
Body Fat calculator
Calculate your body fat percentage using the U.S. Navy Method. Get accurate body fat estimates with measurements of height, weight, neck, waist, and hip circumference.
Body type calculator
Find your body shape and type for females. Free body type calculator determines if you're hourglass, pear, rectangle, inverted triangle, or triangle shape. Get personalized styling tips and waist-hip ratio analysis.
Calorie calculator
Calculate your daily calorie needs for weight loss, weight gain, or maintenance. Free calorie calculator with BMR, TDEE, and macronutrient breakdown. Get personalized calorie goals based on your activity level and fitness goals.
Healthy weight calculator
Calculate your healthy weight range based on BMI, age, and height. Free healthy weight calculator with visual weight status indicator and personalized recommendations.
Ideal weight calculator
Calculate your ideal body weight using multiple scientific formulas including Robinson, Miller, Devine, and Hamwi. Free ideal weight calculator based on height, gender, and body frame.
Lean body mass calculator
Calculate your lean body mass (LBM) using multiple formulas including Boer, James, and Hume. Free LBM calculator to determine muscle mass and body fat percentage for fitness tracking.
Macro calculator
Calculate your daily macronutrient needs (protein, carbs, fats) based on your goals. Free macro calculator for weight loss, muscle gain, and maintenance with personalized recommendations.
Ovulation calculator
Calculate your ovulation date and fertile window to increase chances of conception. Free ovulation calculator with personalized fertility calendar and cycle tracking.
Pregnancy due date calculator
Calculate your pregnancy due date and track pregnancy milestones. Free pregnancy calculator using LMP, conception date, or ultrasound data with trimester tracking.
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 your Total Daily Energy Expenditure (TDEE) and daily calorie needs based on your activity level. Free online TDEE calculator with personalized recommendations.
Target heart rate calculator
Calculate your target heart rate zones for different fitness goals. Free heart rate calculator with multiple formulas including Karvonen method. Get personalized training zones for fat burning, cardio, and peak performance.
Water intake calculator
Calculate your daily water intake needs based on weight, activity level, and climate. Free online water consumption calculator with personalized hydration recommendations.
HVAC Calculators 6
HDD & CDD Calculator
Calculate heating degree days (HDD) and cooling degree days (CDD) from temperature data. Estimate annual energy consumption for buildings.
U-value & R-value Converter
Convert between U-value and R-value for building insulation. Calculate total thermal resistance for multi-layer assemblies. Free HVAC tool.
Ventilation Calculator
Calculate required ventilation airflow based on room area, occupancy, and ASHRAE standards. Free tool for HVAC engineers and designers.
ACH Calculator
Free ACH calculator to determine air changes per hour based on room volume and airflow rate. Essential for HVAC design, ventilation, and indoor air quality.
Dew Point & RH Calculator
Free online calculator to convert between temperature, relative humidity, and dew point. Calculate psychrometric properties for HVAC applications.
HVAC load calculator
Free online HVAC load calculator to estimate heating and cooling requirements for buildings. Calculate sensible and latent heat loads for proper HVAC system sizing.
Math Calculators 31
Binary calculator
Free online binary calculator for binary arithmetic and bitwise operations. Perform addition, subtraction, multiplication, division, AND, OR, XOR, NOT, and shift operations on binary numbers.
Combinatorics calculator
Free online combinatorics calculator. Calculate permutations (nPr), combinations (nCr), and factorials with big integer support for large numbers.
Complex number calculator
Free online complex number calculator for addition, subtraction, multiplication, division, polar/rectangular conversion, and complex functions. Perfect for math and engineering students.
Cosecant calculator
Free online cosecant calculator to compute csc(x) and arccsc(x). Calculate trigonometric cosecant function with step-by-step explanation. Supports degrees and radians.
Cosine calculator
Free online cosine calculator to calculate cosine and arccosine values. Find cosine of any angle and arccosine of any value with step-by-step calculation.
Cotangent calculator
Free online cotangent calculator to compute cot(x) and arccot(x). Calculate trigonometric cotangent function with step-by-step explanation. Supports degrees and radians.
Derivative & integral calculator
Free online derivative and integral calculator with step-by-step solutions. Calculate derivatives, integrals, and partial derivatives symbolically. Perfect for calculus students.
Exponent calculator
Free online exponent calculator to calculate powers and exponents. Compute base raised to any power with step-by-step calculation and explanation.
Factor calculator
Free online factor calculator to find all factors of a number. Calculate factors, factor pairs, and prime factors with step-by-step explanation.
Factorial calculator
Free online factorial calculator to calculate n! (n factorial). Find the factorial of any positive integer with step-by-step calculation and explanation.
Fraction calculator
Free online fraction calculator to add, subtract, multiply, divide, and simplify fractions. Perform fraction operations with step-by-step calculation and explanation.
GCF calculator
Free online GCF calculator to find the greatest common factor of two or more numbers. Calculate GCF with step-by-step explanation and examples.
Haversine calculator
Free online haversine calculator to compute great-circle distance between two coordinates. Calculate shortest distance on Earth's surface with step-by-step explanation.
Hex calculator
Free online hex calculator to convert between hexadecimal and decimal numbers. Perform hex arithmetic operations with step-by-step calculation and explanation.
LCM calculator
Free online LCM calculator to find the least common multiple of two or more numbers. Calculate LCM with step-by-step explanation and examples.
Ln calculator
Free online natural logarithm calculator. Calculate ln(x) with step-by-step explanation and common logarithm values.
Log calculator
Free online log calculator to calculate logarithms with any base. Find log base 10, natural log, and custom base logarithms with step-by-step calculation.
Matrix calculator
Free online matrix calculator with operations including determinant, inverse, transpose, eigenvalues, and matrix multiplication. Perfect for linear algebra students and professionals.
Modular arithmetic calculator
Free online modular arithmetic calculator. Calculate modulo operations, modular inverse, modular exponentiation, and solve modular equations.
Percentage calculator
Free online percentage calculator with 5 different calculation types. Calculate percentage of value, percentage change, increase/decrease, and more. Perfect for discounts, taxes, and financial calculations.
Polynomial solver
Free online polynomial equation solver. Solve polynomial equations of any degree with real and complex roots. Find solutions for linear, quadratic, cubic, and higher-degree polynomials.
Quadratic equation solver
Free online quadratic equation solver. Solve ax² + bx + c = 0 with step-by-step solution using the quadratic formula.
Random number generator
Free online random number generator. Generate random numbers within a specified range with customizable step size and quantity. Perfect for games, simulations, and statistical analysis.
Ratio calculator
Free online ratio calculator to calculate ratios, proportions, and aspect ratios. Find missing values in ratios and solve proportion problems with step-by-step calculation.
Root calculator
Free online root calculator to calculate square roots, cube roots, and nth roots. Find roots of any number with step-by-step calculation and explanation.
Scientific calculator
Free online scientific calculator with advanced mathematical functions including trigonometry, logarithms, exponentials, and more. Perfect for students and professionals.
Secant calculator
Free online secant calculator to compute sec(x) and arcsec(x). Calculate trigonometric secant function with step-by-step explanation. Supports degrees and radians.
Sine calculator
Free online sine calculator to calculate sine and arcsine values. Find sine of any angle and arcsine of any value with step-by-step calculation.
Statistics calculator
Free online statistics calculator. Calculate mean, median, mode, range, variance, standard deviation, z-scores, and quartiles for any dataset.
Tangent calculator
Free online tangent calculator. Calculate tan(x) in degrees or radians and inverse tangent (arctan) with common tangent values table.
Versine calculator
Free online versine calculator to compute versin(x) and inverse versine (aversin). Calculate trigonometric versine function with step-by-step explanation. Supports degrees and radians.
Wire Calculators 7
AWG to mm converter
Convert AWG wire gauge to millimeters instantly. Free online AWG to mm converter with diameter and cross-sectional area calculations. Professional electrical engineering tool.
SWG to mm converter
Convert SWG (Standard Wire Gauge) to millimeters instantly. Free online SWG to mm converter with diameter and cross-sectional area calculations. British wire gauge converter.
Three-phase voltage drop
Calculate three-phase voltage drop for Delta and Wye configurations with power factor. Professional electrical engineering calculator for industrial systems.
Voltage drop calculator
Calculate voltage drop in electrical circuits. Free online voltage drop calculator for DC and AC circuits with multiple wire types and materials.
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 online wire gauge calculator for AWG wires. Calculate diameter, cross-sectional area, and electrical resistance. Support for copper, aluminum, and other wire materials.
Wire resistance calculator
Calculate electrical wire resistance with temperature compensation. Supports copper, aluminum, and other materials. Free online wire resistance calculator.
Geography & Mapping Tools 6
Area & Perimeter
Free area and perimeter calculator: calculate polygon area, perimeter, and centroid from GPS coordinates. Get results in multiple units instantly.
Route Distance
Free route distance calculator: calculate total distance for multi-point routes. Get segment distances and total trip distance for GPS waypoints instantly.
Polygon Calculator
Free polygon calculator: calculate area, perimeter, and centroid of any polygon. Draw on map, import GeoJSON/WKT, get results in multiple units instantly.
UTM / MGRS Converter
Free UTM MGRS converter: convert between Latitude/Longitude, UTM, and MGRS coordinates. Batch conversion from CSV/TXT files. Military grid reference system.
Distance & Bearing
Free distance and bearing calculator: calculate great-circle distance, initial/final bearing between two GPS coordinates. Accurate geodesic distance calculator.
Coordinate Converter
Free coordinate converter: convert between Decimal Degrees (DD), Degrees Minutes Seconds (DMS), and Degrees Decimal Minutes (DDM). GPS coordinate format converter.
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
Measure social media engagement instantly. Calculate engagement rates per followers and impressions with detailed interaction breakdown for Instagram, TikTok, Facebook, Twitter, and YouTube.
TikTok Money Calculator
Calculate TikTok earnings instantly. Estimate Creator Fund revenue and sponsorship income from views, followers, and engagement rates.
YouTube Money Calculator
Calculate YouTube earnings instantly. Estimate revenue from views or subscribers with CPM ranges, engagement rates, and regional adjustments.
Time Tools 15
Lunar Calendar
Convert between solar and lunar calendar dates. Free Chinese lunar calendar converter with zodiac animals and stem-branch system. Accurate date conversion tool.
Work Shift Scheduler
Free online work shift scheduler. Create rotating employee schedules, manage work shifts, and export to CSV or ICS calendar format. Perfect for shift planning and team scheduling.
Equinox & Solstice
Find exact dates and times of spring equinox, summer solstice, autumn equinox, and winter solstice for any year. Free astronomical calculator with timeline visualization.
Daylight Duration
Calculate total daylight hours for any date and GPS location. Enter coordinates or auto-detect your position to get sunrise, sunset, and day versus night duration instantly.
Season Calendar
Free season calendar calculator. Find exact start and end dates for spring, summer, autumn, and winter based on astronomical equinoxes and solstices for any hemisphere.
Sun Path
Visualize sun path and find golden hour times for photography. Interactive chart shows sun position, altitude, azimuth throughout the day. Perfect for photographers.
Sunrise Sunset
Free sunrise sunset calculator. Find sunrise, sunset, solar noon times for any location and date. Includes twilight times. Accurate astronomical calculations.
Moon Phase Calendar
Free moon phase calendar showing lunar cycles, full moons, new moons. Track moon phases by month or year. Beautiful interactive lunar calendar with illumination percentages.
Age calculator
Calculate your exact age in years, months, days, hours, minutes and seconds. Find out when you will reach a certain age. Free online age calculator with detailed breakdown.
Birthday calculator
Calculate your next birthday date, age at next birthday, and time remaining until your next birthday. Free online birthday calculator with detailed breakdown.
Date Difference Calculator
Free online date difference calculator. Calculate the exact number of days, weeks, months, and years between two dates. Perfect for age calculation, project planning, event countdown, and date duration analysis.
Pomodoro Timer
Free Pomodoro timer for productivity. 25-minute focus sessions with breaks. Track completed sessions, view statistics, and boost your work efficiency with the Pomodoro Technique.
Time Add Subtract Calculator
Free online time calculator to add or subtract hours, minutes, and seconds. Perfect for calculating work hours, time tracking, scheduling, project planning, and time duration calculations. Easy to use with instant results.
Time Interval Splitter
Split time ranges into equal intervals for scheduling, shift planning, and time management. Create hourly blocks, meeting slots, and work periods with visual timeline.
Working Days Calculator
Free online working days calculator. Calculate business days between dates, add or subtract workdays, exclude weekends and holidays. Perfect for project planning, deadline calculation, and leave management.
Video Tools 2
Bitrate Calculator
Calculate video bitrate or expected file size from duration in seconds or HH:MM:SS. Compare codecs, resolutions, and plan uploads without guesswork.
Video Upload Time
Estimate how long it takes to upload your video based on file size, bandwidth, and network overhead. Pick presets or enter custom speeds to plan deliveries confidently.
