Unit Converter

Length Unit Converter

Kilometer (km)

Meter (m)

Centimeter (cm)

Millimeter (mm)

Micrometer (μm)

Nanometer (nm)

Picometer (pm)

Femtometer (fm)

Bohr (Bohr)

Ångström (Å)

Inch (in)

Foot (ft)

Yard (yd)

Mile (mi)

Length Unit Conversion Chart

1 m = 0.00100000 km

Meter (m) to Kilometer (km)

Meter (m) to Centimeter (cm)

Meter (m) to Millimeter (mm)

Meter (m) to Inch (in) (inch)

Meter (m) to Foot (ft)

Meter (m) to Yard (yd)

1 m = 0.000621371 mi

Meter (m) to Mile (mi) (mile)

1 m = 1,000,000 μm

Meter (m) to Micrometer (μm) (um)

1 m = 1,000,000,000 nm

Meter (m) to Nanometer (nm)

Kilometer (km) to Meter (m)

1 km = 100,000 cm

Kilometer (km) to Centimeter (cm)

1 km = 1,000,000 mm

Kilometer (km) to Millimeter (mm)

1 km = 39,370.079 in

Kilometer (km) to Inch (in) (inch)

1 km = 3,280.84 ft

Kilometer (km) to Foot (ft)

1 km = 1,093.613 yd

Kilometer (km) to Yard (yd)

1 km = 0.621371 mi

Kilometer (km) to Mile (mi) (mile)

1 km = 1,000,000,000 μm

Kilometer (km) to Micrometer (μm) (um)

1 km = 1,000,000,000,000 nm

Kilometer (km) to Nanometer (nm)

1 cm = 0.0100000 m

Centimeter (cm) to Meter (m)

1 cm = 0.0000100000 km

Centimeter (cm) to Kilometer (km)

Centimeter (cm) to Millimeter (mm)

1 cm = 0.393701 in

Centimeter (cm) to Inch (in) (inch)

1 cm = 0.0328084 ft

Centimeter (cm) to Foot (ft)

1 cm = 0.0109361 yd

Centimeter (cm) to Yard (yd)

1 cm = 0.00000621371 mi

Centimeter (cm) to Mile (mi) (mile)

1 cm = 10,000 μm

Centimeter (cm) to Micrometer (μm) (um)

1 cm = 10,000,000 nm

Centimeter (cm) to Nanometer (nm)

1 mm = 0.00100000 m

Millimeter (mm) to Meter (m)

1 mm = 0.00000100000 km

Millimeter (mm) to Kilometer (km)

1 mm = 0.100000 cm

Millimeter (mm) to Centimeter (cm)

1 mm = 0.0393701 in

Millimeter (mm) to Inch (in) (inch)

1 mm = 0.00328084 ft

Millimeter (mm) to Foot (ft)

1 mm = 0.00109361 yd

Millimeter (mm) to Yard (yd)

1 mm = 6.21371e-7 mi

Millimeter (mm) to Mile (mi) (mile)

1 mm = 1,000 μm

Millimeter (mm) to Micrometer (μm) (um)

1 mm = 1,000,000 nm

Millimeter (mm) to Nanometer (nm)

1 in = 0.0254000 m

Inch (in) (inch) to Meter (m)

1 in = 0.0000254000 km

Inch (in) (inch) to Kilometer (km)

Inch (in) (inch) to Centimeter (cm)

Inch (in) (inch) to Millimeter (mm)

1 in = 0.0833333 ft

Inch (in) (inch) to Foot (ft)

1 in = 0.0277778 yd

Inch (in) (inch) to Yard (yd)

1 in = 0.0000157828 mi

Inch (in) (inch) to Mile (mi) (mile)

1 in = 25,400 μm

Inch (in) (inch) to Micrometer (μm) (um)

1 in = 25,400,000 nm

Inch (in) (inch) to Nanometer (nm)

1 ft = 0.304800 m

Foot (ft) to Meter (m)

1 ft = 0.000304800 km

Foot (ft) to Kilometer (km)

1 ft = 30.48 cm

Foot (ft) to Centimeter (cm)

1 ft = 304.8 mm

Foot (ft) to Millimeter (mm)

Foot (ft) to Inch (in) (inch)

1 ft = 0.333333 yd

Foot (ft) to Yard (yd)

1 ft = 0.000189394 mi

Foot (ft) to Mile (mi) (mile)

1 ft = 304,800 μm

Foot (ft) to Micrometer (μm) (um)

1 ft = 304,800,000 nm

Foot (ft) to Nanometer (nm)

1 yd = 0.914400 m

Yard (yd) to Meter (m)

1 yd = 0.000914400 km

Yard (yd) to Kilometer (km)

1 yd = 91.44 cm

Yard (yd) to Centimeter (cm)

1 yd = 914.4 mm

Yard (yd) to Millimeter (mm)

Yard (yd) to Inch (in) (inch)

Yard (yd) to Foot (ft)

1 yd = 0.000568182 mi

Yard (yd) to Mile (mi) (mile)

1 yd = 914,400 μm

Yard (yd) to Micrometer (μm) (um)

1 yd = 914,400,000 nm

Yard (yd) to Nanometer (nm)

1 mi = 1,609.344 m

Mile (mi) (mile) to Meter (m)

1 mi = 1.609 km

Mile (mi) (mile) to Kilometer (km)

1 mi = 160,934.4 cm

Mile (mi) (mile) to Centimeter (cm)

1 mi = 1,609,344 mm

Mile (mi) (mile) to Millimeter (mm)

1 mi = 63,360 in

Mile (mi) (mile) to Inch (in) (inch)

1 mi = 5,280 ft

Mile (mi) (mile) to Foot (ft)

1 mi = 1,760 yd

Mile (mi) (mile) to Yard (yd)

1 mi = 1,609,344,000 μm

Mile (mi) (mile) to Micrometer (μm) (um)

1 mi = 1,609,344,000,000 nm

Mile (mi) (mile) to Nanometer (nm)

1 μm = 0.00000100000 m

Micrometer (μm) (um) to Meter (m)

1 μm = 1.00000e-9 km

Micrometer (μm) (um) to Kilometer (km)

1 μm = 0.000100000 cm

Micrometer (μm) (um) to Centimeter (cm)

1 μm = 0.00100000 mm

Micrometer (μm) (um) to Millimeter (mm)

1 μm = 0.0000393701 in

Micrometer (μm) (um) to Inch (in) (inch)

1 μm = 0.00000328084 ft

Micrometer (μm) (um) to Foot (ft)

1 μm = 0.00000109361 yd

Micrometer (μm) (um) to Yard (yd)

1 μm = 6.21371e-10 mi

Micrometer (μm) (um) to Mile (mi) (mile)

1 μm = 1,000 nm

Micrometer (μm) (um) to Nanometer (nm)

1 nm = 1.00000e-9 m

Nanometer (nm) to Meter (m)

1 nm = 1.00000e-12 km

Nanometer (nm) to Kilometer (km)

1 nm = 1.00000e-7 cm

Nanometer (nm) to Centimeter (cm)

1 nm = 0.00000100000 mm

Nanometer (nm) to Millimeter (mm)

1 nm = 3.93701e-8 in

Nanometer (nm) to Inch (in) (inch)

1 nm = 3.28084e-9 ft

Nanometer (nm) to Foot (ft)

1 nm = 1.09361e-9 yd

Nanometer (nm) to Yard (yd)

1 nm = 6.21371e-13 mi

Nanometer (nm) to Mile (mi) (mile)

1 nm = 0.00100000 μm

Nanometer (nm) to Micrometer (μm) (um)

Common length unit conversions: meter to centimeter (m to cm), kilometer to meter (km to m), centimeter to millimeter (cm to mm), inch to centimeter (in to cm), foot to meter (ft to m), yard to meter (yd to m), mile to kilometer (mi to km), micrometer to millimeter (μm to mm), nanometer to micrometer (nm to μm). Convert length units easily with precise calculations.

Principles & formula sources

Length conversion is a pure scaling task: units share the same reference (SI meter, m). Metric prefixes (mm, cm, km) are powers of ten; inch/foot/yard/mile are defined exactly in meters.

We compute: target = source × (source→m) ÷ (target→m). Errors usually come from rounding, not the formula.

Formula & example

Formula: value_target = value_source * (source_to_m) / (target_to_m).

Example: 2.5 km = 2500 m; 10 in = 25.4 cm.

Common errors & notes

Avoid intermediate rounding; round once at the end.
Symbols: μm (um) vs mm; Å (angstrom) vs nm; verify the prefix/character.
For scientific reports, consider significant-figure rounding.

Practical use cases

Use length conversions when comparing specs across regions (CAD drawings, construction plans, and lab equipment catalogs often mix metric and imperial).

For microscopy or optics, keep units consistent in the same scale (nm, um, mm) to avoid order-of-magnitude mistakes.

References / data sources

BIPM — The International System of Units (SI Brochure, 9th ed.)
NIST SP 811 — Guide for the Use of the International System of Units (SI)
NIST — Exact definitions for inch/foot/yard