Free · Unit conversions

Kilometers, Metric Lengths & Customary Distances Converter

Convert kilometers, metric lengths & customary distances with exact unit definitions and editable results.

  • Formula & worked example
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Calculator inputs

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How to use this calculator

  1. Enter the known values in the units shown. Results update as you type.
  2. Where results are editable, change one to solve backwards. Lock a value to hold it fixed.
  3. Use the worked example to check the method. Reset restores the starting fields.

Private by default

Inputs and results stay in this browser tab. Bookify does not upload or store the values you enter.

Formula and method

1.609344 km = 1 mile = 1,609.344 m. Each fixed-unit field expresses the same distance. The mile here is the international statute mile, not a nautical mile.

1.609344 km = 1 mile = 1,609.344 m

Worked example

Enter these known values and leave the other values blank.

Kilometers
1.609344 km
Millimeters
1609344 mm
Centimeters
160934 cm
Meters
1609.3 m
Inches
63360 in
Feet
5280 ft
Yards
1760 yd
Miles
1 mi

Assumptions and limitations

  • Each fixed-unit field expresses the same distance. The mile here is the international statute mile, not a nautical mile.
  • These are linear lengths, not areas or volumes. Square and cubic units require squared and cubed conversion factors.
  • The arithmetic accepts signed values for directed differences. Physical heights and ordinary distances should be entered as nonnegative magnitudes. Display rounding does not improve the precision of a measurement.

Common questions

Can I convert back from the result?

Yes. Enter a known value in another field and leave the original field blank. Every field describes the same underlying length.

How should I read a compound length?

When a compound unit is selected, use colons between the displayed components. A decimal value in feet is not the same as feet followed by inches.

References

The calculation equations, inverse formulas, units, and input rules were imported from this source. Bookify provides the interface and equation solver.

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