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Unit Converters

Browse all 16 unit converters tools

What is unit converters?

Unit converters transform measurements from one system or unit to another using exact conversion factors — such as 1 mile = 1.60934 km or 1 pound = 453.592 grams — making it easy to work across metric, imperial, and US customary measurement systems.

Area Converter

Convert between square feet, square meters, acres, hectares, and more with quick reference tables.

square feet to square metersacres to hectaresarea converter
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Bra Size Calculator

Convert bra sizes between US, UK, EU, AU, and FR/IT systems. Enter band and cup size to see all equivalents.

bra size converterbra size chartus to eu bra size
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Energy Converter

Convert between joules, calories, kWh, BTU, and more. Includes food calorie conversions.

joules to calorieskwh to joulesenergy converter
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Imperial Volume Converter

Convert UK gallons, pints, and fluid ounces to liters and milliliters. Compare US vs UK sizes.

uk gallon to litersimperial pintuk fluid ounce
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Length/Distance Converter

Convert between miles, kilometers, meters, feet, yards, and inches with quick reference tables.

miles to kmkm to milesdistance converter
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Material Volume↔Weight Calculator

Convert volume to weight (or weight to volume) for 24 common materials using density lookup.

volume to weightweight to volumematerial density
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Power Converter

Convert between watts, horsepower, BTU/hr, and more. Includes mechanical and metric hp.

watts to horsepowerkw to hppower converter
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Pressure Converter

Convert between PSI, bar, atm, kPa, and more with quick reference tables.

psi to barbar to psipressure converter
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Ring Size Converter

Convert ring sizes between US, UK, EU, Japanese, and Swiss sizing systems instantly.

ring size converterring size chartus to uk ring size
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Shoe Size Converter

Convert shoe sizes between US, UK, EU, and CM systems for men, women, and kids.

shoe size converterus to eu shoe sizeshoe size chart
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Speed Converter

Convert between mph, km/h, m/s, knots, and ft/s with quick reference tables.

mph to kmhkmh to mphspeed converter
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Temperature Converter

Convert between Fahrenheit, Celsius, and Kelvin with quick reference tables and formulas.

fahrenheit to celsiuscelsius to fahrenheitkelvin converter
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Time Converter

Convert between hours, minutes, seconds, days, weeks, and milliseconds with quick reference tables.

hours to minutesminutes to secondstime converter
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Tire Size Converter

Decode metric tire sizes (225/55R17) and calculate overall diameter, sidewall height, and revolutions per mile.

tire size convertertire size calculator225/55r17 diameter
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Volume Converter

Convert between gallons, liters, cups, milliliters, and more with quick reference tables.

gallons to literscups to mlvolume converter
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Weight/Mass Converter

Convert between pounds, kilograms, grams, ounces, stones, and milligrams with live updates.

pounds to kgkilograms to poundsgrams to ounces
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Formula & Methodology

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Did you know? The United States is one of only three countries (along with Myanmar and Liberia) that has not officially adopted the metric system. A 1999 NASA Mars orbiter was lost because one team used metric units and another used US customary units — a $327 million mistake.

Sources

  • National Institute of Standards and Technology (NIST) — Unit conversion factors and measurement standards
  • International Bureau of Weights and Measures (BIPM) — SI system and international conversion standards

Frequently Asked Questions