Unit Converters

Beyond the everyday length, weight and temperature converters there are tools for specific jobs: the area converter includes acres, hectares, marla and kanal for property listings; the volume converter covers cups, tablespoons and both US and UK gallons; the time converter, pressure converter (psi, bar, kPa, mmHg) and energy converter (kcal, kJ, kWh, BTU) cover the rest of the common units.

Every converter uses the internationally agreed definitions: an inch is exactly 2.54 centimetres, a pound is exactly 0.45359237 kilograms, a mile is exactly 1,609.344 metres and a knot is one nautical mile (1,852 metres) per hour. Temperature uses the standard formulas between Celsius, Fahrenheit, Kelvin and Rankine. Data sizes show both decimal units (1 KB = 1,000 bytes, as drive makers count) and binary units (1 KiB = 1,024 bytes, as operating systems count), which is why a 1 TB drive appears as about 931 GiB.

• Swap the two units with one click.
• Results use sensible precision: whole numbers for large values, more decimals for small ones.
• The full table lets you copy the figure in any unit without changing the selection.
• Every converter except currency runs entirely in your browser, so it keeps working offline once the page has loaded.

Each pair below opens the converter already set to the right units, with the formula, a reference table and worked examples.

Length: centimeters to inches, inches to centimeters, millimeters to inches, inches to millimeters, inches to feet, feet to inches, feet to centimeters, centimeters to feet, feet to meters, meters to feet, miles to kilometers, kilometers to miles, yards to meters, meters to yards, centimeters to millimeters, millimeters to centimeters, kilometers to meters, meters to centimeters, inches to meters, meters to inches, miles to feet, feet to miles, yards to feet.

Weight: kilograms to pounds, pounds to kilograms, ounces to grams, grams to ounces, stone to pounds, pounds to stone, kilograms to stone, stone to kilograms, pounds to ounces, ounces to pounds, kilograms to grams, grams to kilograms.

Temperature: degrees Celsius to degrees Fahrenheit, degrees Fahrenheit to degrees Celsius, degrees Celsius to kelvin, kelvin to degrees Celsius.

Volume and cooking: milliliters to fluid ounces, fluid ounces to milliliters, liters to gallons, gallons to liters, cups to milliliters, milliliters to cups, tablespoons to milliliters, teaspoons to milliliters, liters to milliliters, milliliters to liters.

Speed: miles per hour to kilometers per hour, kilometers per hour to miles per hour, meters per second to kilometers per hour, knots to miles per hour.

Area: square feet to square meters, square meters to square feet, acres to square feet, hectares to acres.

Time: hours to minutes, minutes to hours, days to hours, minutes to seconds, seconds to minutes, weeks to days, days to weeks.

Data size: megabytes to gigabytes, gigabytes to megabytes, kilobytes to megabytes, gigabytes to terabytes, terabytes to gigabytes.