Units
Convert units of measurement online
Kilometres to miles, °C to °F, kilograms to pounds and other measures. Result at once.
What this unit converter can do
- Length: meters, feet, miles, inches
- Weight: kilograms, pounds, ounces
- Volume and area: liters, gallons, m², acres
- Temperature: °C, °F and K with exact formulas
- Speed, pressure, energy, power and force
- Data (KiB/MiB), time, angle, frequency, fuel economy, density, torque and bitrate
How to convert units online
Enter the value
Type the number you want to convert.
Pick the category
Open the dropdown and start typing — e.g. “length” or “pressure” — or choose a category from the list.
Pick the units
Choose the source and target units — swap reverses them.
Set precision
Choose how many decimals to show.
Copy the result
The conversion appears instantly and is copyable.
Frequently asked questions
How do I convert kilometers to miles?
Multiply kilometers by 0.621371: 10 km ≈ 6.21 miles. The reverse is miles × 1.60934. Both pairs are under “Length”.
How is temperature converted?
With exact formulas: °F = °C × 9/5 + 32, and kelvin is °C + 273.15. Values below absolute zero are rejected.
How many kilograms are in a pound?
1 pound = 0.453592 kg. For example, 10 lb ≈ 4.54 kg. Pick “Weight” and the kg–lb pair.
Are data units based on 1000 or 1024?
IEC binary prefixes: 1 KiB = 1024 B, 1 MiB = 1024 KiB (not SI decimal KB/MB).
Which categories does the converter support?
18: length, weight, volume, temperature, speed, data, area, time, pressure, energy, angle, frequency, power, force, fuel economy, density, torque and bitrate.
How do I find the right category?
Open the category dropdown and start typing — the converter matches names, e.g. “length” or “pressure”.
Can I convert between categories?
No — conversion needs matching dimensions. Length to weight has no meaning; pick units within one category.
How accurate are the results?
Conversion uses exact factors; you control displayed decimals. If rounding would show zero for a non-zero value, significant digits are used instead.