Unit Converter
Convert between units with side-by-side visual comparison
10 cm
About this calculator
The Unit Converter covers 15 categories — length, mass, temperature, volume, speed, time, data, area, pressure, energy, frequency, force, torque, angle, and power. Select a category, enter a value, and see the converted result instantly with a side-by-side visual comparison. Perfect for travel, cooking, science, engineering, and everyday unit conversions.
How to convert between units
- Pick a category from the category selector.
- Enter the value you want to convert.
- Choose the source unit (from) and target unit (to).
- Read the converted value and the side-by-side visual comparison.
Common examples
- 100 cm = 39.37 inches
- 1 mile = 1.609 kilometers
- 100°F = 37.78°C
- 1 gallon = 3.785 liters
- 1 GB = 1,000 MB
Frequently asked questions
Which categories does the unit converter support?
Fifteen categories: length, mass and weight, temperature, volume, speed, time, data, area, pressure, energy, frequency, force, torque, angle, and power. Each category has the most common metric and US customary units already configured.
Does the converter distinguish decimal and binary data sizes?
Yes. Decimal units (KB, MB, GB, TB) use powers of 1000, while binary units (KiB, MiB, GiB, TiB) use powers of 1024. Pick the one that matches your context — networking and storage marketing usually use decimal; operating systems often use binary.
Why does temperature use a different formula?
Temperature scales have different zero points, not just different sizes. Converting between Celsius, Fahrenheit, and Kelvin requires an offset in addition to a multiplier, so the calculator uses the proper temperature formulas instead of a simple ratio.
Are volume units US customary or Imperial?
In v1, customary volume units like cup, pint, quart, and gallon use the US customary definitions. The calculator uses standard notation (m/s, km/h, mi/h) for display even though the URL uses compact keys.