↔ 91 tools with visible formulas
Convert any unit.Calculate with confidence.
Conversions and calculators for everyday life, engineering, data, dates and mathematics. Follow the formula and check each step.
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Length and distance
8Area
7Weight and mass
6Temperature
4Capacity and volume
7Speed, pace and fuel
6Pressure, energy and power
939Pound per square inch ↔ Barpsi ↔ bar↗40Kilopascal ↔ Pound per square inchkPa ↔ psi↗41Pascal ↔ Kilopascal ↔ MegapascalPa ↔ kPa ↔ MPa↗42Joule ↔ Thermochemical calorieJ ↔ cal↗43Kilocalorie ↔ Kilojoulekcal ↔ kJ↗44Watt ↔ Mechanical horsepowerW ↔ hp↗45Kilowatt ↔ BTU per hourkW ↔ BTU/h↗46Kilowatt-hour ↔ JoulekWh ↔ J↗47Newton-meter ↔ Pound-footN·m ↔ lb-ft↗
Data and networks
648Byte ↔ Kilobyte ↔ Megabyte ↔ Gigabyte ↔ TerabyteB ↔ KB ↔ MB ↔ GB ↔ TB↗49Megabyte ↔ Mebibyte ↔ Gigabyte ↔ GibibyteMB ↔ MiB ↔ GB ↔ GiB↗50Megabit per second ↔ Megabyte per secondMbps ↔ MB/s↗51Download timeData and networks↗52Image pixels and file sizeData and networks↗53Video bitrate and file sizeData and networks↗
Time and dates
854Second ↔ Minute ↔ Hour ↔ Days ↔ min ↔ h ↔ d↗55Week ↔ Average month ↔ Average Gregorian yearwk ↔ mo ↔ yr↗56Time-zone converterTime and dates↗57UTC and local timeTime and dates↗5812-hour and 24-hour timeTime and dates↗59Days between datesTime and dates↗60Business daysTime and dates↗61Add or subtract daysTime and dates↗
Currencies and international sizes
1062Currency converterCurrencies and international sizes↗63Historical currency converterCurrencies and international sizes↗64Multi-currency price comparisonCurrencies and international sizes↗65Currency conversion with feesCurrencies and international sizes↗66Cross-border exchange costCurrencies and international sizes↗67International shoe sizesCurrencies and international sizes↗68International clothing sizesCurrencies and international sizes↗69Ring sizesCurrencies and international sizes↗70Paper sizesCurrencies and international sizes↗71Screen dimensionsCurrencies and international sizes↗
Mathematics and engineering
2072PercentageMathematics and engineering↗73Percentage changeMathematics and engineering↗74RatioMathematics and engineering↗75Mean, median and modeMathematics and engineering↗76Standard deviationMathematics and engineering↗77Fraction calculatorMathematics and engineering↗78Scientific calculatorMathematics and engineering↗79Quadratic equationMathematics and engineering↗80Permutations and combinationsMathematics and engineering↗81ProbabilityMathematics and engineering↗82Circle, triangle and rectangle areasMathematics and engineering↗83Cylinder, sphere and cone volumesMathematics and engineering↗84Slope and distanceMathematics and engineering↗85Ohm’s lawMathematics and engineering↗86Electrical powerMathematics and engineering↗87Resistor color bandsMathematics and engineering↗88LED series resistorMathematics and engineering↗89Screen pixel densityMathematics and engineering↗90Aspect ratioMathematics and engineering↗91CSS clamp() font sizeMathematics and engineering↗
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Field notes
Field notes ↗A little context. A better answer.
01
A 100 Mbps connection, a 12 MB/s download: what is actually slow?
Check the units before blaming your connection. Then estimate the remaining time from the transfer you are actually getting.
Read the guide ↗02Why cups-to-grams charts disagree — and how to measure flour
A cup of flour is not a cup of water by weight. Choose the right reference before changing your recipe.
Read the guide ↗03Will that screen actually fit? Measure more than the diagonal
Before buying a television or monitor, turn inches into useful dimensions—and keep the stand, frame and cables in the calculation.
Read the guide ↗