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Unit Converter
Convert between metric and imperial units across length, weight, temperature, speed, area, and volume. Instant results as you type.
Frequently Asked Questions
The formula is: °F = (°C × 9/5) + 32. For quick mental maths, double the Celsius temperature and add 30 for a rough estimate. For example, 20°C ≈ 68°F (exact: 68°F).
1 mile = 1.60934 kilometres. A handy shortcut: multiply miles by 1.6 to get kilometres. Or use the Fibonacci trick — consecutive Fibonacci numbers (e.g. 5 and 8) approximate the miles-to-km ratio (5 miles ≈ 8 km).
Mass (kg, lb) measures how much matter is in an object and stays constant everywhere. Weight is the force gravity exerts on that mass and varies by location. In everyday use, people use them interchangeably, but they're physically distinct concepts.