Fuel Efficiency Mass / kWh/kg → MJ/kg
Convert Kilowatt-hours per kilogram to Megajoules per kilogram
Convert fuel energy per mass and reciprocal specific fuel consumption. Convert Kilowatt-hours per kilogram (kWh/kg) to Megajoules per kilogram (MJ/kg). Find the formula, worked examples, unit definitions, and practical guidance below.
Reverse: Megajoules per kilogram to Kilowatt-hours per kilogram →
How to convert kilowatt-hours per kilogram to megajoules 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 kWh/kg, b for the intermediate value in J/kg, and y for the result in MJ/kg.
MJ/kg = kWh/kg × 3600000 ÷ 1000000
Worked examples
10 kWh/kg ≈ 36 MJ/kg
Step 1: (10 × 3600000) ≈ 36000000 J/kg.
Step 2: 36000000 ÷ 1000000 ≈ 36 MJ/kg.20 kWh/kg ≈ 72 MJ/kg
Step 1: (20 × 3600000) ≈ 72000000 J/kg.
Step 2: 72000000 ÷ 1000000 ≈ 72 MJ/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 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.
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.
Definitions and sources
Carry the same physical assumptions into subsequent physics calculations.
Kilowatt-hours per kilogram to megajoules per kilogram reference table
| Kilowatt-hours per kilogram (kWh/kg) | Megajoules per kilogram (MJ/kg) |
|---|---|
| 1 | 3.6 |
| 5 | 18 |
| 10 | 36 |
| 25 | 90 |
| 50 | 180 |
| 100 | 360 |
| 1000 | 3600 |
Browse every fuel efficiency mass conversion →