Specific energy converter

Convert energy per unit mass for fuels, materials and thermodynamics. Use the interactive converter to enter your own value and select any supported pair in this family.

Popular conversions

Use the interactive converter to enter your own value and select any supported pair in this family.

Supported units (9)

Each row links to the live converter. The factor column uses the family’s stated base unit for linear families; for specialized reciprocal or numeral systems, use the live converter and the family-specific explanation.

Source unitFactor to base unitTool
joule per kilogram
J-kg
1Convert this unit ↗
kilojoule per kilogram
kJ-kg
1000Convert this unit ↗
megajoule per kilogram
MJ-kg
1000000Convert this unit ↗
watt-hour per kilogram
Wh-kg
3600Convert this unit ↗
kilowatt-hour per kilogram
kWh-kg
3600000Convert this unit ↗
calorie per gram
cal-g
4184Convert this unit ↗
kilocalorie per kilogram
kcal-kg
4184Convert this unit ↗
BTU per pound
Btu-lb
2326Convert this unit ↗
erg per gram
erg-g
0.0001Convert this unit ↗

Important note

Unit standards, historical definitions and approximations can vary. Cooking volume-to-mass conversions depend on the ingredient; currencies require an exchange rate; sizing systems may be discrete; and logarithmic quantities such as decibels need purpose-built formulas rather than a linear scale.

For laboratory, medical, aviation, engineering or other safety-critical work, verify the definitions and standards that apply to your use case.