Unit converters

Interactive converters and reference tables for length, weight, temperature, area, volume, speed, pressure, energy and fuel economy.

• Area unit conversion Convert square meters, hectares, acres, square feet, and square miles instantly, with formulas, worked examples, and a free converter & printable chart.
• Clothing size conversion (approx) Rough mapping of letter sizes (XS–XXL) across US, UK, EU, and CN clothing labels, including men’s shirt neck and pant waist measurements, too.
• Cooking measurement conversion Convert teaspoons, tablespoons, cups, butter sticks, and oven temperatures between US recipe units and metric — with flour and sugar cup weights.
• Data storage units (KB MB GB TB) Bits, bytes, and decimal vs binary prefixes used by disks and OS displays, from kilobytes up to petabytes — quickly see which unit fits your case.
• Energy and power units Convert between joule, calorie, kWh, BTU, watt, and horsepower — handy for home appliances, fitness, and science. Check and compare values fast.
• Fuel economy conversion (MPG ↔ L/100 km) Convert US MPG and UK MPG to L/100 km and back — exact 235.215 / 282.481 constants, a 10–50 MPG chart, and an instant converter for any value.
• Length unit conversion Length conversions: meter, kilometer, mile, foot, inch, yard, nautical mile with exact factors, examples and a free converter & printable chart.
• Paper sizes (ISO A series & Letter) ISO A0–A6 paper sizes in millimeters and inches, plus US Letter, Legal, and Tabloid — with the history behind A versus Letter and printer margins.
• Pressure unit conversion Convert between pascals, bars, psi, atmospheres and mmHg: tire pressures in bar vs psi, weather-map hectopascals around 1013, and lab vacuum readings.
• Shoe size conversion (US UK EU JP) Approximate men’s and women’s shoe size conversion across US, UK, EU, and JP systems — measure your foot in cm and match it to the right size.
• SI unit prefixes (nano to tera) Metric prefixes from nano to tera with symbols and powers of ten — a quick reference table for every SI multiplier. Find the right one in seconds.
• Speed unit conversion Convert km/h, mph, knots and Mach instantly — exact factors, a full reference table, and mental-math tricks for drivers, pilots and runners.
• Temperature conversion (°C °F K) Convert temperatures between Celsius, Fahrenheit, and Kelvin — exact formulas, key reference points, and a free converter & printable chart.
• Volume unit conversion Convert liters, milliliters, US/UK gallons, quarts, pints, cups, fluid ounces and cubic meters instantly — free online converter & printable chart.
• Weight and mass unit conversion Convert kilograms, pounds, ounces and stone instantly — exact 2.20462 factor, a clear reference chart, and practical notes on luggage and baking.