Length Conversion Calculator
Use our length conversion calculator to quickly convert between common metric and imperial length units. This tool allows you to convert measurements such as millimetres, centimetres, metres, kilometres, inches, feet, yards and miles with ease.
Enter a value and select the units you want to convert from and to see the result instantly. This calculator is useful for everyday measurements, work, study and general reference.
Enter a value and select the units you want to convert from and to see the result instantly. This calculator is useful for everyday measurements, work, study and general reference.
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Disclaimer: This calculator provides conversion results for general informational use only. Last checked/updated January 2026.
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How the Length Conversion Calculator Works
This calculator converts length measurements using standard, widely accepted conversion values. It supports both metric and imperial units and calculates accurate results based on the units selected.
Supported units include:
Supported units include:
The calculator applies the correct conversion factor automatically and displays the converted value.
Metric and Imperial Length Units Explained
Metric units such as millimetres, centimetres, metres and kilometres are commonly used worldwide. Imperial units like inches, feet, yards and miles are still widely used in the UK and other countries for certain measurements.
This calculator makes it easy to convert between the two systems without manual calculations.
Example 1: DIY & Home Improvement (Imperial to Metric)
If you are following an old carpentry guide that asks for a piece of wood 3 feet and 4 inches long, but your modern tape measure is only in centimetres:
– First, convert the measurement into inches (3 feet × 12 = 36 inches, plus 4 inches = 40 inches).
– Input 40 inches into the calculator, which converts it to exactly 101.6 centimetres. This ensures your cuts remain precise when switching between systems.
Example 2: Running & Fitness (Metric to Imperial)
If you have signed up for a 5k charity run but you track your training runs in miles:
– Input 5 kilometres into the calculator, which converts it to roughly 3.1 miles. This allows you to plan your training distances without guessing.
This calculator makes it easy to convert between the two systems without manual calculations.
Example 1: DIY & Home Improvement (Imperial to Metric)
If you are following an old carpentry guide that asks for a piece of wood 3 feet and 4 inches long, but your modern tape measure is only in centimetres:
– First, convert the measurement into inches (3 feet × 12 = 36 inches, plus 4 inches = 40 inches).
– Input 40 inches into the calculator, which converts it to exactly 101.6 centimetres. This ensures your cuts remain precise when switching between systems.
Example 2: Running & Fitness (Metric to Imperial)
If you have signed up for a 5k charity run but you track your training runs in miles:
– Input 5 kilometres into the calculator, which converts it to roughly 3.1 miles. This allows you to plan your training distances without guessing.
When Should You Use a Length Converter?
This calculator is particularly useful when you want to:
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About This Length Conversion Calculator
This length conversion calculator uses standard unit conversion values to provide accurate and reliable results. It is designed to be simple to use and accessible across devices.
While suitable for general measurement conversions, this tool should not be relied upon for specialised technical or engineering applications without verification.
We hope you find this calculator useful, click here to find out how we build our calculators.
While suitable for general measurement conversions, this tool should not be relied upon for specialised technical or engineering applications without verification.
We hope you find this calculator useful, click here to find out how we build our calculators.
Frequently Asked Questions
What units can I convert with this calculator?
You can convert between the most common metric units (millimetres, centimetres, metres, kilometres) and imperial units (inches, feet, yards, miles). This covers everything from small-scale crafting measurements to long-distance travel.
Are the conversion results accurate?
Yes. The calculator uses standard, widely accepted conversion values.
Can I convert between metric and imperial units?
Yes, that is the primary purpose of this tool. The UK occupies a unique middle ground where we use metric for scientific and commercial packaging, but imperial for road signs (miles) and often personal height (feet/inches). This tool helps bridge that gap effortlessly.
Is this calculator free to use?
Yes. All calculators on Calchub are free to use. You’re welcome to bookmark any of your favourites and use them as many times as you would like.
Do I need to sign up to use this tool?
No. No registration or sign-up is required.
Disclaimer
This calculator provides length conversion results for general informational purposes only.
Last checked/updated January 2026.
Last checked/updated January 2026.