Unit Converter
Unit Converter converts between units of length, mass, temperature, volume, area, speed, data and time. Pick a category and two units and the answer updates as you type. Conversion factors are the authoritative definitions rather than rounded approximations.
Runs entirely in your browser — nothing you enter is uploaded.
CalculatorRate: 1 Metre = 3.28083989501 Foot
About converting units
Most units convert by multiplication: a metre is exactly 3.280839895 feet because the foot is defined as 0.3048 metres, so the factor is a definition rather than a measurement. Temperature is the exception, and it is why it is handled separately here. Celsius and Fahrenheit have different zero points as well as different degree sizes, so converting requires an offset and a scale — a change of 10°C is 18°F, but 10°C is 50°F.
Two other traps are worth naming. The US and imperial gallons are different units — 3.785 against 4.546 litres, roughly twenty per cent apart — and pints and fluid ounces differ likewise, so any converter worth using lists them separately. And data units are genuinely ambiguous: a kilobyte is 1,000 bytes by the SI definition that drive manufacturers use, while operating systems have historically shown 1,024, which is why a "1TB" disk appears smaller once it is formatted.
Common questions
- Why is temperature converted differently from other units?
- Because Celsius and Fahrenheit are affine scales rather than proportional ones: they disagree about where zero is as well as about the size of a degree. So conversion needs both a multiplication and an offset. This is why a temperature difference and a temperature convert differently — a rise of 10°C is a rise of 18°F, but 10°C is 50°F.
- Is a US gallon the same as a UK gallon?
- No, and the difference is large enough to ruin a recipe. A US gallon is 3.785 litres and a UK imperial gallon is 4.546, about twenty per cent bigger. US and UK pints and fluid ounces differ too. They are listed separately here for that reason; a converter offering a single unnamed "gallon" cannot be trusted.
- Is a kilobyte 1,000 or 1,024 bytes?
- Both definitions are in use, which is the problem. The SI prefix means 1,000, and that is what storage manufacturers use; operating systems have traditionally shown powers of two, so 1,024. The standards bodies coined kibibyte for 1,024, which never caught on in everyday use. The gap is why a 1TB drive reports as roughly 931GB once formatted.
- How accurate are the conversion factors?
- They are the authoritative definitions rather than rounded shortcuts. The inch is defined as exactly 25.4 millimetres and the pound as exactly 0.45359237 kilograms, so those conversions are exact by definition rather than measured. Results are rounded for display only, after the calculation, not before it.