Unit Converter
Convert between metric and imperial units across length, weight, temperature, volume, area and more.
About the Unit Converter
A unit converter translates a measurement from one unit to another within the same quantity, such as length, weight, temperature, volume, area, speed or data size. Each conversion multiplies by a fixed factor, except temperature, which also needs an offset. The tool applies the right factors automatically.
Two systems are in everyday use. The metric system (SI) is based on powers of ten and used by almost every country, while imperial and US customary units survive in the United States and some everyday uses elsewhere. Useful exact values: 1 inch is 2.54 centimetres, 1 pound is 0.45359237 kilograms and 1 mile is 1.609344 kilometres.
Beware units that share a name but differ in size. A US gallon is about 3.785 litres, an imperial gallon about 4.546 litres. In computing, a kilobyte is often 1,024 bytes to operating systems but 1,000 bytes to storage manufacturers, which is why a drive can look smaller than advertised.
250 grams of flour is about 8.8 ounces. A 5 km run is about 3.1 miles, and 72 degrees Fahrenheit is 22.2 degrees Celsius.
Tips for best results
- For engineering or scientific work, keep extra decimal places during the calculation and round only the final result.
- Write the unit next to every number in your working so mistakes are easy to spot.
How to use the Unit Converter
Why use Toolseza for Unit Converter?
Use this tool as often as you need with no paywalls, premium tiers, or hidden daily calculation quotas.
All calculations and file manipulations run inside your web browser. Your inputs are never sent to a cloud server.
Results update in real-time as you type or adjust settings, with instant one-click copy and export capabilities.
Works natively on smartphones, tablets, laptops, and desktop computers with zero installation or account creation.
Editorial Standards & Verification: All formulas, algorithms, and conversion factors implemented on Toolseza adhere to openly documented international standards (ISO, NIST, BIPM, W3C). Results are verified against benchmark reference datasets before publication.
Frequently Asked Questions
What units can I convert?
Length (metres, feet, miles, km), weight (kg, lbs, oz), temperature (Celsius, Fahrenheit), volume (litres, gallons) and more.
Is the converter accurate?
Yes — all conversions use standard mathematical formulas and exact conversion factors.