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Calculators & Converters

Percentages, BMI, unit conversions, and everyday calculations.

56 free tools · browser-local

Popular workflows

Common tasks

  • Convert metric and imperial units.
  • Calculate percentages and percent changes.
  • Check BMI from height and weight.
  • Prepare quick measurement estimates locally.

All tools in this category

BMK Performance Benchmark Builder Calculate mean and variance from benchmark sample numbers ToolPerformanceBenchmark KG Mass Converter Convert kg, g, lb, and oz values locally ToolMassConverter FLOW Volume Flow Rate Converter Convert m3/s, L/s, L/min, and gal/min values ToolVolumeFlow TIME Time Unit Converter Convert seconds, minutes, hours, and days ToolTimeUnit MBPS Data Transfer Rate Converter Convert MB/s, Mbps, KB/s, and GB/s estimates ToolDataTransfer MPG Fuel Economy Converter Convert mpg to L/100km and km/L estimates ToolFuelEconomy PACE Pace Converter Convert running pace between min/km and min/mile ToolPaceConverter 16:9 Aspect Ratio Calculator Calculate missing width or height from an aspect ratio ToolAspectRatio SALE Discount Calculator Calculate sale price and savings from a discount percent ToolDiscountCalculator TIP Tip Calculator Calculate tip, total, and split amount ToolTipCalculator BYTE Bytes Converter Convert bytes, KB, MB, GB, and GiB estimates ToolBytesConverter AVG Average Calculator Calculate average, min, max, and count from pasted numbers ToolAverageCalculator RTO Ratio Simplifier Simplify two-number ratios with a greatest common divisor ToolRatioSimplifier PPM PPM Converter Convert ppm to percent and decimal estimates ToolPPMConverter UNIT Unit Converter Convert common metric and imperial units in one browser-local calculator ToolUnitConverter KG Weight Converter Convert kilograms, pounds, ounces, grams, and stones instantly ToolWeightConverter C/F Temperature Converter Convert Celsius, Fahrenheit, and Kelvin with exact formulas ToolTemperatureConverter AREA Area Converter Convert square meters, feet, acres, hectares, and more ToolAreaConverter VOL Volume Converter Convert liters, gallons, cups, milliliters, and cubic units ToolVolumeConverter SPD Speed Converter Convert mph, km/h, m/s, knots, and feet per second ToolSpeedConverter % Percentage Calculator Calculate percentages, percent change, and what percent one number is of another ToolPercentageCalculator BMI BMI Calculator Calculate body mass index from metric or US height and weight inputs ToolBMICalculator KM Geographic Distance Calculator Calculate great-circle distance between two latitude and longitude pairs ToolGeographicDistance HDD HDD Capacity Calculator Convert advertised disk capacity to usable GiB and TiB estimates ToolHDDCapacity SI SI Prefixes Converter Convert SI-prefixed values locally for quick, non-certified estimates ToolPrefixesConverter DEG Angle Converter Convert degrees, radians, turns, and grads for quick, non-certified estimates ToolAngleConverter PA Pressure Converter Convert pascal, bar, atmosphere, psi, and torr values for quick, non-certified estimates ToolPressureConverter N Force Converter Convert newtons, kilonewtons, dyne, kilogram-force, and pound-force for quick, non-certified estimates ToolForceConverter J Energy Converter Convert joules, watt-hours, kilowatt-hours, calories, and BTU for quick, non-certified estimates ToolEnergyConverter W Power Converter Convert watts, kilowatts, horsepower, and BTU per hour for quick, non-certified estimates ToolPowerConverter NM Torque Converter Convert newton-meters, pound-feet, pound-inches, and kilogram-force meters for quick, non-certified estimates ToolTorqueConverter ρ Density Calculator Calculate density, mass, or volume from two known values for quick, non-certified estimates ToolDensityCalculator HZ Frequency Wavelength Calculator Convert frequency and wavelength using the speed of light for quick, non-certified estimates ToolFrequencyWavelength Ω Ohm's Law Calculator Solve voltage, current, resistance, and power for quick, non-certified estimates ToolOhmLaw RΩ Resistor Color Code Calculator Decode 4-band resistor colors for quick, non-certified estimates ToolResistorColor V/T Kinematics Calculator Solve constant-acceleration values for quick, non-certified estimates ToolKinematicsCalculator ACC Acceleration Converter Convert m/s2, ft/s2, and g acceleration values locally ToolAccelerationConverter PPM Concentration Converter Convert percent, ppm, and decimal concentration values ToolConcentrationConverter CUP Cooking Measure Converter Convert cups, tablespoons, teaspoons, and milliliters locally ToolCookingMeasure RND Number Rounder Round pasted numbers to useful decimal places locally ToolNumberRounder 1/2 Fraction Decimal Converter Convert simple fractions and decimals locally ToolFractionDecimal LTV Loan To Value Calculator Calculate LTV percentage from loan and asset values ToolLoanValue BE Break Even Calculator Calculate break-even units from fixed cost, price, and variable cost ToolBreakEven M% Margin Markup Calculator Calculate margin and markup from cost and price locally ToolMarginMarkup ROI ROI Calculator Calculate return on investment from gain and cost values ToolROICalculator CAGR CAGR Calculator Calculate compound annual growth rate locally ToolCAGRCalculator AGE Age Calculator Calculate age in years and days from dates ToolAgeCalculator DAYS Date Difference Calculator Calculate days between two dates locally ToolDateDifference WORK Working Days Calculator Estimate weekdays between two dates in the browser ToolWorkingDays GPA GPA Calculator Calculate simple grade point averages locally ToolGPACalculator GRD Grade Percentage Calculator Calculate grade percentages from score and total values ToolGradePercentage TAX Sales Tax Calculator Calculate sales tax and total price locally ToolSalesTax FEE Payment Fee Calculator Estimate payment processing fees from amount and rate ToolPaymentFee FIT Aspect Fit Calculator Fit one rectangle inside another while keeping aspect ratio ToolAspectFit PPI Pixel Density Calculator Calculate PPI from resolution and diagonal size ToolPixelDensity REM REM PX Calculator Convert rem and px values with a browser-local base size ToolREMCalculator

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