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Unit Converters

Browse all 32 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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Centimeters to Inches Converter

Convert centimeters (cm) to inches (in) instantly. Full chart from 1–250 cm with formula and reverse direction.

cm to inchescentimeter to inchescentimeters to inches
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Cups to Quarts Converter

Convert cups to US quarts. Chart, formula, and reverse direction.

cups to quartscups to a gallonhow many cups in a quart
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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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Feet to Meters Converter

Convert feet (ft) to meters (m) instantly. Chart, height conversions, and reverse direction.

feet to metersft to mconvert feet to meters
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Fluid Ounces to Gallons Converter

Convert fluid ounces to US gallons. Chart, formula, and reverse direction.

oz to gallonsfl oz to gallonsounces in gal
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Fluid Ounces to Milliliters Converter

Convert fluid ounces (fl oz) to milliliters (mL). Includes cup, can, pint references.

oz to mlfl oz to mlfluid ounces to milliliters
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Gallons to Fluid Ounces Converter

Convert US gallons to fluid ounces. Chart, formula, and reverse direction.

gallons to ozgallons to fluid ounceshow many oz in a gallon
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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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Inches to Centimeters Converter

Convert inches (in) to centimeters (cm) instantly. Full chart with formula and reverse direction.

inches to cmin to cminches to centimeters
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Inches to Millimeters Converter

Convert inches (in) to millimeters (mm) instantly. Includes fractional-inch reference and chart.

inches to mmin to mminches to millimeters
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Kilograms to Pounds Converter

Convert kilograms (kg) to pounds (lb) instantly. Full chart from 1–150 kg with formula, reverse direction, and quick estimation tips.

kg to poundskg to lbskilograms to pounds
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Kilometers to Miles Converter

Convert kilometers (km) to miles (mi) instantly. Chart, running races, formula, and reverse direction.

km to mileskilometers to mileskm in miles
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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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Miles to Kilometers Converter

Convert miles (mi) to kilometers (km) instantly. Chart with running distances, formula, and reverse direction.

miles to kmmi to kmmiles to kilometers
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Millimeters to Inches Converter

Convert millimeters (mm) to inches (in) instantly. Full chart with formula and reverse direction.

mm to inchesmillimeters to inchesconvert mm to inches
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Ounces to Pounds Converter

Convert ounces (oz) to pounds (lb) instantly. Full chart, formula, and reverse direction.

oz to lbsoz to lbounces to pounds
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Pounds to Kilograms Converter

Convert pounds (lb) to kilograms (kg) instantly. Full chart from 1–250 lb with formula, reverse direction, and quick estimation tips.

pounds to kglbs to kglb to kg
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Pounds to Ounces Converter

Convert pounds (lb) to ounces (oz) instantly. Full chart, formula, and reverse direction.

lbs to ozlb to ozpounds to ounces
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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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Quarts to Gallons Converter

Convert quarts to US gallons. Chart, formula, and reverse direction.

quarts to gallonshow many quarts in a gallonhow many oz to a quart
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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

💡

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