🔄 Unit Conversion Calculator
Convert between metric and imperial units across 8 categories: Length, Weight/Mass, Temperature, Volume, Speed, Time, Energy, and Data Storage. Enter a value, select your units, and get instant results with a full conversion table.
| Unit | Value |
|---|
How Unit Conversion Works
For linear units (length, weight, volume, speed, time, energy, data), every unit is expressed relative to a base unit. To convert from unit A to unit B, first convert A to the base unit, then convert to B:
Temperature uses special non-linear formulas: °C to °F: (°C × 9/5) + 32 | °C to K: °C + 273.15 | °F to °C: (°F − 32) × 5/9
SI Base Units
| Quantity | SI Base Unit | Symbol |
|---|---|---|
| Length | Metre | m |
| Mass | Kilogram | kg |
| Time | Second | s |
| Temperature | Kelvin | K |
| Energy | Joule | J |
Frequently Asked Questions
The metric system (SI) uses decimally-related units — metres, kilograms, litres — and is the international standard in science and most countries. The imperial system (feet, pounds, gallons) is still common in the US and UK for everyday use. The key advantage of metric is that conversions are always powers of 10.
To convert °C to °F: multiply by 9/5 then add 32. Example: 100°C × 1.8 + 32 = 212°F (boiling point). To convert °F to °C: subtract 32 then multiply by 5/9. Example: 98.6°F → (98.6 − 32) × 5/9 = 37°C (body temperature). Temperature conversions are non-linear unlike other unit conversions.
The seven SI base units are: metre (length), kilogram (mass), second (time), kelvin (temperature), ampere (electric current), mole (amount of substance), and candela (luminous intensity). All other SI units are derived from these seven.
In the decimal SI system: 1 GB = 1,000,000,000 bytes (10⁹). This is how storage manufacturers measure capacity. In the binary system: 1 GiB (gibibyte) = 1,073,741,824 bytes (2³⁰). Operating systems often display binary gibibytes but label them as GB, which causes the discrepancy between advertised and shown storage space.
A nautical mile equals exactly 1,852 metres (approximately 1.151 statute miles). It is based on the circumference of the Earth — one nautical mile equals one arcminute of latitude. It is the standard unit for maritime and aviation navigation, and the knot (nautical mile per hour) is the corresponding speed unit.
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