How to use this converter
Choose your starting and destination units, then enter a value. Results update as you type. You can swap the direction and choose the displayed precision.
Example: Joules per kilogram to Kilojoules per kilogram
value × 0.001 = result
Here the starting unit is Joules per kilogram (J/kg) and the result is in Kilojoules per kilogram (kJ/kg). This category includes reciprocal relationships. Use a positive input and check the selected direction.
Worked examples
- 1 J/kg ≈ 0.001 kJ/kg
- 10 J/kg ≈ 0.01 kJ/kg
- 100 J/kg ≈ 0.1 kJ/kg
Available fuel efficiency - mass options
Joules per kilogram (J/kg) · Kilojoules per kilogram (kJ/kg) · Megajoules per kilogram (MJ/kg) · Calories (th) per gram (cal/g) · Btu (IT) per pound (Btu/lb) · Kilograms per joule (kg/J) · Grams per kilowatt-hour (g/kWh)
Unit conventions
Energy per mass and mass per energy are reciprocals. This is specific energy, not distance per fuel mass.
Frequently asked questions
Why can displayed results differ slightly?
Numeric results are rounded for display. Increase the precision setting to see more digits. Different unit conventions can also produce different results; check the complete unit label.
Can I convert in the opposite direction?
Use the swap control to reverse the selected units or bases.