Calculator Tools
Reliable calculators for math, finance, health, and engineering. Get instant, accurate results with clean UI and zero distractions.
Calculators 81
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
Discount calculator
Free online discount calculator. Calculate final price, discount amount, and savings percentage. Perfect for shopping, sales, promotions, and finding the best deals.
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 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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
Hex calculator
Free online hex calculator to convert between hexadecimal and decimal numbers. Perform hex arithmetic operations with step-by-step calculation and explanation.
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.
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.
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.
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.
Ln calculator
Free online natural logarithm calculator. Calculate ln(x) with step-by-step explanation and common logarithm values.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
Tangent calculator
Free online tangent calculator. Calculate tan(x) in degrees or radians and inverse tangent (arctan) with common tangent values table.
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.
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.
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.
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.
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.
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.
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.
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.
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.