Fuel Efficiency Mass / MJ/kg → kWh/kg
Convert Megajoules per kilogram to Kilowatt-hours per kilogram
Convert fuel energy per mass and reciprocal specific fuel consumption. Convert Megajoules per kilogram (MJ/kg) to Kilowatt-hours per kilogram (kWh/kg). Find the formula, worked examples, unit definitions, and practical guidance below.
Reverse: Kilowatt-hours per kilogram to Megajoules per kilogram →
How to convert megajoules per kilogram to kilowatt-hours per kilogram
This family describes energy content or energy-normalized fuel use, not kilometers per kilogram. Heating values depend on the fuel and on higher versus lower heating-value conventions. Grams per kWh is the reciprocal of energy per mass.
Use x for the value in MJ/kg, b for the intermediate value in J/kg, and y for the result in kWh/kg.
kWh/kg = MJ/kg × 1000000 ÷ 3600000
Worked examples
10 MJ/kg ≈ 2.77777777778 kWh/kg
Step 1: (10 × 1000000) ≈ 10000000 J/kg.
Step 2: 10000000 ÷ 3600000 ≈ 2.77777777778 kWh/kg.20 MJ/kg ≈ 5.55555555556 kWh/kg
Step 1: (20 × 1000000) ≈ 20000000 J/kg.
Step 2: 20000000 ÷ 3600000 ≈ 5.55555555556 kWh/kg.
Results are rounded to 12 significant digits. Converting units does not increase the precision of the original measurement. Very large or small values outside JavaScript’s finite numeric range are rejected.
About Megajoules per kilogram
Megajoules per kilogram (MJ/kg) measures fuel efficiency mass under the conventions above. The base value in J/kg is (x × 1000000), where x is the numerical value in MJ/kg. Factors shown here are rounded for display; calculations use the stored factor.
About Kilowatt-hours per kilogram
Kilowatt-hours per kilogram (kWh/kg) measures fuel efficiency mass under the conventions above. The base value in J/kg is (x × 3600000), where x is the numerical value in kWh/kg. Factors shown here are rounded for display; calculations use the stored factor.
Definitions and sources
Carry the same physical assumptions into subsequent physics calculations.
Megajoules per kilogram to kilowatt-hours per kilogram reference table
| Megajoules per kilogram (MJ/kg) | Kilowatt-hours per kilogram (kWh/kg) |
|---|---|
| 1 | 0.277777777778 |
| 5 | 1.38888888889 |
| 10 | 2.77777777778 |
| 25 | 6.94444444444 |
| 50 | 13.8888888889 |
| 100 | 27.7777777778 |
| 1000 | 277.777777778 |
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