Unit Converter
Convert length, weight, temperature, speed and more.
From
Enter a value
To
Also editable
How this calculator works
Every unit within a category converts through a fixed base unit — for length, everything routes through metres; for weight, kilograms — so converting kilometres to miles is really two steps under the hood: kilometres to metres, then metres to miles. This keeps every conversion factor internally consistent instead of needing a separate hard-coded ratio for every possible pair of units.
Eight categories, one interface
This tool covers length, mass, temperature, volume, speed, time, area, and digital storage — switching categories keeps the same live, type-in-either-field interaction, so you don't need eight separate converter pages for what's really the same underlying interaction.
Why temperature is different
Most categories convert with a simple multiplication (a ratio), but temperature scales don't share a common zero point — 0°C isn't 0°F or 0K — so temperature conversions need an offset as well as a scale factor. That's handled as a special case here rather than a plain multiplier like every other category.
Both fields are live
Type into either side and the other updates instantly — useful for checking a conversion in reverse without hunting for a separate calculator, or for quickly sanity-checking a number someone else gave you in unfamiliar units.
Frequently Asked Questions
What unit categories does this converter support?
Eight categories: length, mass, temperature, volume, speed, time, area, and digital storage. Switch categories using the selector, and every unit within that category updates live as you type.
How accurate are the conversion factors used?
Standard, internationally recognized conversion factors (e.g., exactly 2.54cm per inch) are used throughout, so results match what you'd get from an authoritative reference.
Can I convert between imperial and metric units?
Yes — that's the primary use case. Pick any unit as your input and see it converted to every other unit in that category simultaneously.
Why is temperature handled differently from other categories?
Most categories convert with a simple ratio, but temperature scales don't share a common zero point — 0°C isn't 0°F or 0K — so temperature conversions need an offset in addition to a scale factor, unlike every other category here.
Does digital storage use 1000 or 1024 as the base for conversions?
1024 per step — 1 MB = 1024 KB, 1 GB = 1024 MB, and so on — matching how operating systems typically report file and drive sizes. Storage manufacturers usually advertise capacity using the decimal 1000-based convention instead, which is why a drive labeled 1 TB shows up as slightly less than 1 TB once formatted and viewed in an OS that uses the 1024-based convention.