How to calculate unit converter
Value × source factor ÷ destination factor °C = (°F − 32) × 5/9 K = °C + 273.15
Worked example. Converted value: 0.001 Kilometer.
Example inputs — Measurement: Length; Value: 1; From: Meter; To: Kilometer. Starting values are illustrative.
From George Guju, founder of Calculyn · Educational calculator guidance, not professional advice.
How it works
Select the measurement type and both units. Length, weight, area and volume use defined conversion factors; temperature uses a scale-specific offset. US and imperial liquid units are labeled separately.
Assumptions & limitations
- US and imperial liquid measures are different; use the labeled unit.
- Temperature cannot be below absolute zero.
- Displayed decimal values are rounded; international unit definitions determine the conversion.
Formula and assumptions reviewed October 2026 by the Calculyn team. How we build our calculators
Frequently asked questions
Are US and imperial gallons the same?
No. A US gallon is 3.785411784 liters; an imperial gallon is 4.54609 liters.