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Length & distance unit converter

Convert between metric and imperial units instantly — centimeters to inches, kilometers to miles, meters to feet, and dozens more. No signup, no clutter.

cm → in km → mi m → ft mm → in ft → m

Metric ↔ Imperial

The most searched conversions — between the metric system used by most of the world and the imperial system used in the US and UK.

cm → in→in → cm→m → ft→ft → m→km → mi→mi → km→mm → in→cm → ft→

Within metric

Conversions between metric units — from everyday measurements to scientific and engineering scales.

km → m→m → cm→m → mm→cm → mm→mm → cm→cm → m→m → km→km → cm→

Within imperial

Converting between feet, inches, yards, and miles — useful for US construction, real estate, and everyday use.

ft → in→in → ft→yd → ft→ft → yd→mi → ft→ft → mi→in → yd→yd → in→

Precision & scientific

Micrometer, nanometer, ångström, and other units used in engineering, optics, and science.

mm → nm→in → mm→

All conversions

km → dm→km → mm→km → um→km → nm→km → nmi→km → yd→km → ft→km → in→km → ly→km → au→km → angstrom→m → dm→m → um→m → nm→m → mi→m → nmi→m → yd→m → in→m → ly→m → au→m → angstrom→dm → km→dm → m→dm → cm→dm → mm→dm → um→dm → nm→dm → mi→dm → nmi→dm → yd→dm → ft→dm → in→dm → ly→dm → au→dm → angstrom→cm → km→cm → dm→cm → um→cm → nm→cm → mi→cm → nmi→cm → yd→cm → ly→cm → au→cm → angstrom→mm → km→mm → m→mm → dm→mm → um→mm → mi→mm → nmi→mm → yd→mm → ft→mm → ly→mm → au→mm → angstrom→um → km→um → m→um → dm→um → cm→um → mm→um → nm→um → mi→um → nmi→um → yd→um → ft→um → in→um → ly→um → au→um → angstrom→nm → km→nm → m→nm → dm→nm → cm→nm → mm→nm → um→nm → mi→nm → nmi→nm → yd→nm → ft→nm → in→nm → ly→nm → au→nm → angstrom→mi → m→mi → dm→mi → cm→mi → mm→mi → um→mi → nm→mi → nmi→mi → yd→mi → in→mi → ly→mi → au→mi → angstrom→nmi → km→nmi → m→nmi → dm→nmi → cm→nmi → mm→nmi → um→nmi → nm→nmi → mi→nmi → yd→nmi → ft→nmi → in→nmi → ly→nmi → au→nmi → angstrom→yd → km→yd → m→yd → dm→yd → cm→yd → mm→yd → um→yd → nm→yd → mi→yd → nmi→yd → ly→yd → au→yd → angstrom→ft → km→ft → dm→ft → cm→ft → mm→ft → um→ft → nm→ft → nmi→ft → ly→ft → au→ft → angstrom→in → km→in → m→in → dm→in → um→in → nm→in → mi→in → nmi→in → ly→in → au→in → angstrom→ly → km→ly → m→ly → dm→ly → cm→ly → mm→ly → um→ly → nm→ly → mi→ly → nmi→ly → yd→ly → ft→ly → in→ly → au→ly → angstrom→au → km→au → m→au → dm→au → cm→au → mm→au → um→au → nm→au → mi→au → nmi→au → yd→au → ft→au → in→au → ly→au → angstrom→angstrom → km→angstrom → m→angstrom → dm→angstrom → cm→angstrom → mm→angstrom → um→angstrom → nm→angstrom → mi→angstrom → nmi→angstrom → yd→angstrom → ft→angstrom → in→angstrom → ly→angstrom → au→

About this tool

The world uses two major measurement systems that will likely coexist for decades: the metric system, used by most countries, and the imperial system, still standard in the United States for everyday measurements. Converting between them is a daily necessity for millions of people — anyone shopping internationally, following a recipe from another country, reading a US technical document, or checking the specs of an imported product.

Length Converter covers the full range of length units: from the kilometer and mile used for travel distances, through the everyday meter, foot, centimeter and inch, down to the millimeter used in engineering and manufacturing, and further into scientific territory with micrometers (µm), nanometers (nm), ångströms (Å), and astronomical units (AU) and light-years used in space science.

All conversion factors are based on internationally standardized definitions. The inch-to-centimeter relationship (1 in = 2.54 cm exactly) has been fixed by international agreement since 1959. The meter is defined by the speed of light. Results are computed in real time as you type and displayed to four decimal places — sufficient for the vast majority of practical applications, from daily use to most engineering contexts.

Instant

Results update as you type — no button to click

Accurate

Based on internationally standardized conversion factors

Free

No account, no paywall, no usage limits