Metric to Imperial Calculator – Instant Unit Conversion
Convert mm, cm, metres, inches, feet, kg, lb, litres and more — fast, accurate results for DIY, workshop and engineering tasks.
Works both ways — metric to imperial and imperial to metric.
Example: 10 mm = 0.39 inches | 1 kg = 2.2 lb | 5 bar = 72.5 psi
What This Metric to Imperial Unit Converter Covers
This unit converter includes the most common measurement categories used in DIY, construction, electronics, and workshop tasks. Instead of searching charts or memorising formulas, simply enter a value and get instant results between metric and imperial units.
- Length: mm, cm, m, km ↔ in, ft, yd, mi
- Area: m², cm², mm², hectare ↔ in², ft², yd², acre
- Volume: ml, L, m³ ↔ in³, ft³, yd³, UK & US gallons
- Mass: mg, g, kg, tonne ↔ oz, lb, st
- Speed: m/s, km/h ↔ mph, ft/s, knot
- Pressure: Pa, kPa, MPa, bar, atm ↔ psi
- Energy & Power: J, kJ, MJ, Wh, kWh, cal, BTU; W, kW ↔ hp
- Torque & Angle: N·m ↔ lbf·ft / lbf·in; degrees, radians, gradians
- Temperature: Celsius ↔ Fahrenheit ↔ Kelvin
Popular Metric to Imperial Conversions
- mm to inches
- metres to feet
- kg to pounds
- litres to gallons
- bar to psi
- celsius to fahrenheit
How to Use the Conversion Calculator
- Select a measurement category such as Length, Pressure, or Temperature.
- Choose the units to convert (e.g. mm to inches or bar to psi).
- Enter your value to see the result instantly.
- Use the ⇄ swap option to reverse the conversion direction.
Useful for DIY, Workshop & Engineering Projects
This metric and imperial converter is ideal when working with tools and materials listed in different systems. For example, drill bits may be listed in mm while older plans use inches, or compressors may show pressure in bar while tools use psi.
Working with screws and drill sizes? Try our pilot hole calculator to match the correct drill bit.
Common Conversion Examples
- Length: 25 mm → inches, 3 m → feet
- Mass: 10 kg → pounds
- Volume: 5 L → UK gallons
- Pressure: 2.5 bar → psi
- Temperature: 20 °C → °F
- Power: 2.2 kW → hp
- Torque: 120 N·m → lbf·ft
Notes
- Temperature conversions between °C, °F, and K use exact formulas.
- All other conversions follow standard SI unit relationships.
- Check whether values refer to UK or US gallons.
From metric to imperial or imperial to metric, this converter provides fast, accurate results for everyday DIY, workshop and engineering use.
Unit Conversion Calculator
Convert common DIY and trade units.
Result
Quick Tips
- Use the ⇄ button to swap units instantly.
- Temperature converts exactly (°C, °F, K); other units use standard SI conversions.
- Round values carefully depending on your project accuracy requirements.
Pro Tips
- Use accurate measuring tools to avoid conversion errors.
- For precision work, a laser distance meter improves speed and accuracy.
- Always double-check conversions before cutting or drilling to avoid costly mistakes.
Metric and Imperial Conversion Guide
Many DIY plans, tool specifications, and workshop guides use a mix of metric and imperial measurements. Builders in the UK often work with millimetres and metres, while older plans or imported tools may use inches, feet, or yards.
This calculator makes it easy to quickly convert between the most common units used in construction, woodworking, electronics, and general workshop work.
Common Metric to Imperial Conversions
| Metric | Imperial |
|---|---|
| 10 mm | 0.39 inches |
| 25 mm | 0.98 inches |
| 50 mm | 1.97 inches |
| 100 mm | 3.94 inches |
| 1 metre | 3.28 feet |
| 10 metres | 32.8 feet |
When Conversions Are Useful
- Reading older woodworking plans that use inches.
- Checking tool specifications from US manufacturers.
- Converting drill bit or screw sizes.
- Working with imported equipment or technical drawings.
If you are drilling pilot holes or matching screw sizes, you may also find our Pilot Hole Calculator useful for selecting the correct drill size.
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