Unit Converter
Convert between common units: temperature (°C, °F, K), length (mm to mi), weight (mg to t), speed (m/s, km/h, mph), and storage (B to TB). Instant bidirectional conversion.
Base unit
32 °F = 0 °C
273.15 K = 0 °C
How to use
- 1 Select the unit category tab: Temperature, Length, Weight, Speed, or Storage.
- 2 Type a value in any unit field — all other fields update instantly.
- 3 Use it for quick on-the-fly conversions without needing to remember formulas.
- 4 Each field shows a small hint with common reference values for context.
Key features
- Five categories: Temperature, Length, Weight, Speed, and Storage
- Type in any field and all others update instantly — fully bidirectional
- No internet connection needed — all conversions run in your browser
- Covers both metric and imperial units
What is a Unit Converter?
A unit converter transforms a quantity expressed in one unit to its equivalent in another unit within the same category. Whether you're converting kilograms to pounds, miles per hour to kilometers per hour, or Celsius to Fahrenheit, the conversion applies a precise mathematical formula to produce an exact result.
This tool supports six categories of units: temperature, length, weight, speed, data storage, and time. Each category has its own set of units and conversion factors — from nanometers to light-years, from bytes to terabytes.
Common Use Cases
International travel
Convert temperatures, distances, and speeds when travelling between countries that use metric and imperial systems.
Science and engineering
Convert between SI units and imperial units for lab measurements, material specifications, or construction plans.
IT and data storage
Convert between bytes, kilobytes, megabytes, gigabytes, and terabytes — including binary vs decimal prefixes.
Software development
Normalize user input to a base unit (e.g., convert everything to meters) before storing and converting to display units.
E-commerce & logistics
Convert product weights and dimensions between metric and imperial for international shipping and customs.
Recipe and cooking
Convert oven temperatures between Celsius, Fahrenheit, and Gas Mark for international recipes.
Key Conversion Formulas
Some conversions use simple factors; others need specific formulas.
| Category | Conversion | Formula |
|---|---|---|
| Temperature | °C → °F | °F = (°C × 9/5) + 32 |
| Temperature | °C → K | K = °C + 273.15 |
| Length | mi → km | km = mi × 1.609344 |
| Weight | kg → lb | lb = kg × 2.204623 |
| Speed | km/h → mph | mph = km/h × 0.621371 |
| Storage | GB → GiB | GiB = GB × 0.931323 (binary vs decimal) |