Unit converter
Choose a category, type a value and see it converted into every unit at once – metric, imperial and US units.
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🔒 Runs entirely in your browser – nothing you enter is uploaded or stored.
How to use it
- Choose the category (e.g. length).
- Enter a value and select its unit.
- All other units are shown instantly – copy the one you need.
Last checked: October 2026 · Based on: SI system; international definitions. Found a mistake? Use the form below – we fix confirmed errors and update the date.
Frequently asked questions
How exact are the conversions?
We use the internationally defined factors (e.g. 1 inch = 2.54 cm exactly, 1 lb = 0.45359237 kg exactly).
What is the difference between MB and MiB?
MB uses powers of 10 (1 MB = 1,000,000 bytes); MiB uses powers of 2 (1 MiB = 1,048,576 bytes). Disk makers use MB/GB, many operating systems show MiB/GiB.
How do I convert °C to °F?
°F = °C × 9/5 + 32. Example: 20 °C = 68 °F.