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Unit Converter

Convert between common units of measurement.

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Frequently Asked Questions

1 inch = 2.54 centimetres. Select Length, set From to "in" and To to "cm", then enter 1.
°F = (°C × 9/5) + 32. For example, 20°C = (20 × 9/5) + 32 = 68°F. Select Temperature and use the converter above.
1 kilogram = 2.20462 pounds. Select Weight, set From to "kg" and To to "lb", enter your value.

Common Unit Conversions

The UK uses a mix of metric and imperial measurements in daily life, which makes unit conversion a frequent need. Road distances are in miles, but athletic distances are in kilometres. Body weight might be in stone, but medical records use kilograms. Cooking recipes can be in cups (US), grams, or ounces.

Quick Reference: Length

1 inch = 2.54 cm. 1 foot = 30.48 cm. 1 mile = 1.609 km. 1 metre = 3.281 feet. A useful approximation: multiply miles by 1.6 to get kilometres, or multiply km by 0.6 to get miles.

Quick Reference: Weight

1 kg = 2.205 lb. 1 stone = 6.35 kg = 14 lb. 1 oz = 28.35 g. To convert stone to kg: multiply by 6.35. To convert kg to stone: divide by 6.35.

Quick Reference: Temperature

°F = (°C × 9/5) + 32. °C = (°F − 32) × 5/9. Key reference points: 0°C = 32°F (freezing). 20°C = 68°F (room temperature). 37°C = 98.6°F (body temperature). 100°C = 212°F (boiling).

Related Calculators

For cooking-specific conversions (cups, tablespoons, gas marks), use the cooking converter. The BMI calculator handles both metric and imperial measurements.

KwikSum's unit converter supports 7 categories: length (mm, cm, m, km, inches, feet, miles), weight (mg, g, kg, oz, lb, stone), temperature (Celsius, Fahrenheit, Kelvin), volume (ml, litres, UK/US gallons, pints), area, speed, and data storage. The formula is shown with every conversion.