How to use the unit converter
- Pick a category (length, weight, temperature, etc.).
- Enter a value and choose the from and to units.
- The result updates instantly — no button needed.
Common conversions
- 1 mile = 1.609 kilometers
- 1 kg = 2.205 pounds
- 0 °C = 32 °F
- 1 liter = 0.264 US gallons
Benefits
- Converts length, weight, temperature, volume and speed all in one place.
- Instant and mobile-friendly.
- Removes the risk of getting a conversion formula wrong by hand.
- Free, with no sign-up.
Limitations to know
- It covers everyday units, not specialized scientific or engineering ones.
- Results are rounded to the displayed number of decimals.
- It is not a currency converter — exchange rates change constantly and are not included.
Common mistakes to avoid
- Mixing up US and imperial gallons, which are different sizes.
- Confusing mass (kilograms) with weight or force.
- Trusting a hand-done temperature conversion — the tool avoids that error.
Alternatives
For percentage math use the Percentage Calculator; for color values use the Color Converter; and to encode data use the Base64 Encoder.
Last updated: August 2026 · Reviewed by the AI Toolbox editorial team.
Frequently asked questions
Does it support metric and imperial?
Yes — both systems, across length, weight, temperature, volume and speed.
How accurate is it?
Conversions use standard factors and are accurate to several decimal places.
Is it free?
Yes, completely free with no sign-up.