Unit Converter

Different units. One simple answer.

Convert measurements instantly between metric and imperial units. From inches to centimetres, pounds to kilograms and Fahrenheit to Celsius, get accurate results in seconds.

📏 Six conversion categories ⚡ Instant results 🔄 Swap units 🌎 Metric & imperial

🔄 Convert your measurements

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💡 Enter a number and choose your units. Results update automatically. Negative values are supported for temperature conversions.

⭐ Common conversions

Select a preset below to load a frequently used conversion.

⚙️ Conversion accuracy

Conversions use standard mathematical factors and are calculated in your browser. Results are displayed with up to eight decimal places, although calculations retain greater internal precision.

US liquid gallons and cups are used for US customary volume measurements. UK imperial gallons are listed separately.

🧠 How to convert between measurement units

Most unit conversions involve multiplying a measurement by a conversion factor. For example, one inch is exactly 2.54 centimetres, so you can convert inches to centimetres by multiplying by 2.54.

🧮 Example: Convert 10 feet to metres

One international foot equals exactly 0.3048 metres. Multiply 10 by 0.3048 to calculate the equivalent measurement.

📏 10 feet = 3.048 metres

🌡️ How temperature conversions work

Unlike most unit conversions, Celsius and Fahrenheit require both multiplication and an offset. For example, to convert Celsius to Fahrenheit, multiply by 9/5 and add 32.

Celsius to Fahrenheit: °F = (°C × 9/5) + 32.

Fahrenheit to Celsius: °C = (°F − 32) × 5/9.

💡 Frequently Asked Questions

📏 How many centimetres are in an inch?

One inch equals exactly 2.54 centimetres. Multiply inches by 2.54 to convert to centimetres.

⚖️ How many pounds are in a kilogram?

One kilogram equals approximately 2.20462 pounds. Multiply kilograms by this factor to convert to pounds.

🏡 How many square feet are in a square metre?

One square metre equals approximately 10.7639 square feet. Area conversions use squared length factors.

🧪 Are US gallons and imperial gallons the same?

No. One US liquid gallon equals approximately 3.78541 litres, while one UK imperial gallon equals 4.54609 litres.

🌡️ What is 100°F in Celsius?

100 degrees Fahrenheit equals approximately 37.78 degrees Celsius.

🚗 How do I convert miles per hour to kilometres per hour?

Multiply miles per hour by 1.609344. For example, 60 mph equals approximately 96.56 km/h.