Unit Converter

Measurement type

Value

Use a decimal point (1.5), optional thousands commas (1,234.5), or scientific notation (1.5e3). Swap keeps your value and reverses the units.

From unit

To unit

Result: 3.280839895 ft

Significant digits

Rounding affects the display only. Very small or large results use scientific notation. Calculations use standard double precision.

Feet, yards and miles use international definitions. Computer points are 1/72 inch; picas are 1/6 inch.

All equivalent units
Unit	Result
Kilometer (km)	0.001
Meter (m)	1
Decimeter (dm)	10
Centimeter (cm)	100
Millimeter (mm)	1,000
Micrometer (µm)	1,000,000
Nanometer (nm)	1,000,000,000
Ångström (Å)	10,000,000,000
Picometer (pm)	1E12
Femtometer (fm)	1E15
Inch (in)	39.37007874
Foot (ft)	3.280839895
Yard (yd)	1.093613298
Mile (mi)	0.0006213711922
Nautical mile (nmi)	0.0005399568035
Mil / thousandth of an inch (mil)	39,370.07874
Computer point (pt)	2,834.645669
Computer pica (pc)	236.2204724

How it works

Select a measurement type, enter a value and choose the source and target units. Results and the reference table update as you type. Swap reverses the units while retaining the input. Copy saves the displayed result with its unit; reset returns to 1 meter in feet.

Example

One mile is 1.609344 kilometers. One pound is 0.45359237 kilograms. Water freezes at 0 °C, 32 °F or 273.15 K. One US liquid gallon is 3.785411784 liters; one imperial gallon is 4.54609 liters.

Frequently asked questions

Why are there different gallons, ounces and tons?

US and imperial volume units have different definitions. Fluid ounces measure volume; avoirdupois and troy ounces measure mass. Metric tonnes, US short tons and imperial long tons are also different. Choose the explicitly labeled unit. Converting volume to mass requires a material’s density and is not part of this tool.

How accurate are the results?

Conversions use defining constants where available, with standard double-precision arithmetic. Select 6, 10 or 15 significant digits for display. Results are rounded, not arbitrary-precision measurements. Temperature conversions include scale offsets and apply to readings, not temperature differences.