About this specific energy converter
Convert specific energy units for fuels, batteries, propellants, thermal storage materials, and energy-per-mass engineering comparisons.
Specific energy measures energy per unit mass, which is different from volumetric energy density measured per unit volume.
Units covered
Specific energy units
J/kg, kJ/kg, Wh/kg, cal/g, BTU/lb, ft·lbf/slug, and lb·ft/lb.
Fuel and battery work
Helpful for comparing gasoline, hydrogen, lithium-ion cells, fuels, and propellants by mass.
Standard variants
Includes IT and thermochemical calorie and BTU definitions for precise source matching.
How to use it
- Enter the energy-per-mass value.
- Select the source unit and target unit.
- Convert all materials to a common unit before comparing fuel or battery performance.