Free online unit converter — length, weight, temperature, area, speed and data across 37 units. Real-time results, browser-based.
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Unit Converter supports real-time conversion across 6 categories and 37 units: length, weight, temperature, area, speed, and data.
We support length, weight, temperature, area, speed, data size, and more categories with multiple units each.
One inch is exactly 2.54 cm — the value is fixed by international agreement, not rounded. Going the other way, 1 cm is about 0.3937 inch; use the length tab whenever you deal with monitors, tyres or plumbing sizes that are specified in inches.
Pick the weight tab, choose kg as the source unit and the pound value appears as you type. The exact factor is 1 kg = 2.2046226 lb; multiplying by 2.2 in your head is within 1 % if you only need a rough figure.
Yes — the temperature category converts between Celsius, Fahrenheit and Kelvin. Temperature scales have different zero points, so it is not a plain multiplication: the formula is °F = °C × 9/5 + 32. That puts 0 °C at 32 °F and 100 °C at 212 °F.