Kilowatt-hour per kilogram (kWh/kg)
Exactly 3.6 MJ/kg. Used for battery and hydrogen energy density.
What is a kilowatt-hour per kilogram?
- Symbol
- kWh/kg
- Quantity
- Fuel Energy per Mass
- Unit system
- SI-accepted
- Definition
- Exactly 3.6 MJ/kg. Used for battery and hydrogen energy density.
- Exact
- Yes, the value is exact by definition
- Source
- SI Brochure, 9th edition (BIPM, 2019)
Common applications
Used to compare fuels with electricity, for example the energy content of hydrogen (about 33 kWh/kg on a lower heating value basis).
Kilowatt-hour per kilogram in other fuel energy per mass units
- 1 kWh/kg = 3600000 J/kgJoule per kilogram
- 1 kWh/kg = 3600 kJ/kgKilojoule per kilogram
- 1 kWh/kg = 3.6 MJ/kgKilowatt-hour per kilogram to Megajoule per kilogram converter
- 1 kWh/kg = 1000 Wh/kgWatt-hour per kilogram
- 1 kWh/kg ≈ 1547.72141 BTU/lbBTU per pound
- 1 kWh/kg ≈ 859.8452279 kcal/kgKilocalorie (IT) per kilogram
Kilowatt-hour per kilogram quick reference
| Kilowatt-hour per kilogram | Megajoule per kilogram | BTU per pound | Joule per kilogram |
|---|---|---|---|
| 1 kWh/kg | = 3.6 MJ/kg | ≈ 1547.72141 BTU/lb | = 3600000 J/kg |
| 10 kWh/kg | = 36 MJ/kg | ≈ 15477.2141 BTU/lb | = 36000000 J/kg |
| 100 kWh/kg | = 360 MJ/kg | ≈ 154772.141 BTU/lb | = 360000000 J/kg |
| 1000 kWh/kg | = 3600 MJ/kg | ≈ 1547721.41 BTU/lb | = 3600000000 J/kg |
Where the kilowatt-hour per kilogram fits
The next smaller fuel energy per mass unit is the megajoule per kilogram (MJ/kg). 1 kWh/kg = 3.6 MJ/kg, and 1 MJ/kg ≈ 0.2777777778 kWh/kg.
Frequently asked questions
- How many megajoules per kilogram are in one kilowatt-hour per kilogram?
- One kilowatt-hour per kilogram = 3.6 MJ/kg (megajoules per kilogram).
- How many BTUs per pound are in one kilowatt-hour per kilogram?
- One kilowatt-hour per kilogram ≈ 1547.72141 BTU/lb (BTUs per pound).
- How many joules per kilogram are in one kilowatt-hour per kilogram?
- One kilowatt-hour per kilogram = 3600000 J/kg (joules per kilogram).