Fuel Efficiency Mass / g/kWh → kJ/kg
Convert Grams per kilowatt-hour to Kilojoules per kilogram
Convert fuel energy per mass and reciprocal specific fuel consumption. Convert Grams per kilowatt-hour (g/kWh) to Kilojoules per kilogram (kJ/kg). Find the formula, worked examples, unit definitions, and practical guidance below.
Reverse: Kilojoules per kilogram to Grams per kilowatt-hour →
How to convert grams per kilowatt-hour 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 g/kWh, b for the intermediate value in J/kg, and y for the result in kJ/kg.
b = 3600000000 ÷ x; y = b ÷ 1000
Worked examples
10 g/kWh ≈ 360000 kJ/kg
Step 1: 3600000000 ÷ 10 ≈ 360000000 J/kg.
Step 2: 360000000 ÷ 1000 ≈ 360000 kJ/kg.20 g/kWh ≈ 180000 kJ/kg
Step 1: 3600000000 ÷ 20 ≈ 180000000 J/kg.
Step 2: 180000000 ÷ 1000 ≈ 180000 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 Grams per kilowatt-hour
Grams per kilowatt-hour relates inversely to Joules per kilogram. The base value is 3600000000 ÷ x, where x is the numerical value in g/kWh. A zero or negative reciprocal input is outside this calculator’s physical domain.
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.
Grams per kilowatt-hour to kilojoules per kilogram reference table
| Grams per kilowatt-hour (g/kWh) | Kilojoules per kilogram (kJ/kg) |
|---|---|
| 1 | 3600000 |
| 5 | 720000 |
| 10 | 360000 |
| 25 | 144000 |
| 50 | 72000 |
| 100 | 36000 |
| 1000 | 3600 |
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