Length Converter

Convert a length between the supported metric and imperial units. Enter your own values below to see converted value and check the method behind it.

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Your inputs

Change the example values to match your situation.

Your result

Let’s work it out.

Fill in your inputs and select Calculate.
Your result and breakdown will appear here.

How this calculator works

Converted value = input × source unit factor ÷ destination unit factor.

Before you use the result

  • International foot = exactly 0.3048 metres.

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What is Length Converter?

Length Converter helps you convert a length between the supported metric and imperial units.

The main result is converted value, with a breakdown of conversion factor. The formula, example and assumptions below explain how to interpret it.

How to use Length Converter

Use the example to get familiar with the form, then enter your own figures. Any rates in the example are illustrative. Check the field labels and units before calculating.

  1. Gather value, from unit and to unit. Use values from the same situation or reporting period.
  2. Replace the example value with your own value, then complete the other fields. Check the displayed units and each selected option.
  3. Select Calculate and read converted value with its result breakdown. Change one input and calculate again to compare a second scenario. Reset restores the original example.
  • Enter value, at least 0. Decimals are accepted.
  • Choose from unit from metres, kilometres, centimetres, millimetres, feet, inches, yards and miles.
  • Choose to unit from metres, kilometres, centimetres, millimetres, feet, inches, yards and miles.

Length Converter: a worked example

With the inputs below, the result is 0.001 kilometres (converted value). Follow the example, then replace these illustrative values with your own.

Example inputs and output
Input or outputExample value
Value1
From unitmetres
To unitkilometres
Converted value0.001 kilometres
Conversion factor0.001

Understanding the Length result

Read converted value alongside conversion factor. These describe different parts of the same calculation.

Displayed results use a readable number of decimal places. When checking a result by hand, keep extra precision until the last step. To compare scenarios, change one input at a time and keep the others fixed.

  • Example Conversion factor: 0.001

Length Converter: assumptions and common mistakes

A useful estimate starts with the right inputs. Check the following assumptions and limits before applying the result to your situation.

  • International foot = exactly 0.3048 metres.
  • Select the correct unit system. US and imperial gallons differ, local land units vary, and exchange rates need a dated source.

For wider guidance, visit NIST measurement units. The formula and scope of this specific tool are stated on this page.

Length Converter FAQs

What does Length Converter calculate?

Length Converter helps you convert a length between the supported metric and imperial units. Its main output is converted value in kilometres.

What inputs do I need for Length Converter?

You need value, from unit and to unit. Use the field labels and units to match your figures to the formula.

Which formula does Length Converter use?

Converted value = input × source unit factor ÷ destination unit factor.

What is a worked example for Length Converter?

Example inputs: Value: 1; From unit: metres; To unit: kilometres. The result is 0.001 kilometres (converted value).

How should I enter value?

Enter value, at least 0. Decimals are accepted.

How do I choose from unit?

Choose from unit from metres, kilometres, centimetres, millimetres, feet, inches, yards and miles. The example uses metres; replace it if your circumstances differ.

How should I read converted value?

Read converted value alongside conversion factor. These describe different parts of the same calculation.

Why might my Length Converter result differ from my records?

International foot = exactly 0.3048 metres. Differences in entered values, units or rounding can also change the comparison.

Can I compare two scenarios in Length Converter?

Yes. Note your first converted value, change value or another input, and select Calculate again. Editing a field clears the old result so it is not mistaken for a new calculation.

Is Length Converter free, and where are my inputs calculated?

This calculator is free to use without signing in. Its formula runs in your browser; calculator inputs are not sent to a calculation API. The inputs reset to the example values when you reset the form or start a fresh page.