Fuel Efficiency Mass / kWh/kg → kJ/kg
Convert Kilowatt-hours per kilogram to Kilojoules per kilogram
Convert fuel energy per mass and reciprocal specific fuel consumption. Convert Kilowatt-hours per kilogram (kWh/kg) to Kilojoules per kilogram (kJ/kg). Find the formula, worked examples, unit definitions, and practical guidance below.
Reverse: Kilojoules per kilogram to Kilowatt-hours per kilogram →
How to convert kilowatt-hours per kilogram to kilojoules 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 kJ/kg.
kJ/kg = kWh/kg × 3600000 ÷ 1000
Worked examples
10 kWh/kg ≈ 36000 kJ/kg
Step 1: (10 × 3600000) ≈ 36000000 J/kg.
Step 2: 36000000 ÷ 1000 ≈ 36000 kJ/kg.20 kWh/kg ≈ 72000 kJ/kg
Step 1: (20 × 3600000) ≈ 72000000 J/kg.
Step 2: 72000000 ÷ 1000 ≈ 72000 kJ/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 Kilojoules per kilogram
Kilojoules per kilogram (kJ/kg) measures fuel efficiency mass under the conventions above. The base value in J/kg is (x × 1000), where x is the numerical value in kJ/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 kilojoules per kilogram reference table
| Kilowatt-hours per kilogram (kWh/kg) | Kilojoules per kilogram (kJ/kg) |
|---|---|
| 1 | 3600 |
| 5 | 18000 |
| 10 | 36000 |
| 25 | 90000 |
| 50 | 180000 |
| 100 | 360000 |
| 1000 | 3600000 |
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