1. Convert to base units
joules = input value x input unit factor
Every supported energy unit is stored as a factor relative to joules.
Mechanical unit converter
Energy Unit Converter
Convert energy units for mechanics, thermodynamics, power systems, batteries, HVAC, physics, and engineering calculations.
Live energy conversion
Convert energy units
Enter a value, choose the starting unit, and select a target unit. The full energy conversion table updates automatically.
Converted value
All units
Energy conversion table
Compare the entered value across mechanical, electrical, thermal, and physics energy units.
Common conversions
Useful energy conversion factors
| Conversion | Factor | Typical use |
|---|---|---|
| kWh to MJ | MJ = kWh x 3.6 | Electrical energy and billing |
| BTU to kJ | kJ = BTU x 1.05505585 | HVAC and heat transfer |
| kcal to kJ | kJ = kcal x 4.184 | Thermal and food energy |
| Wh to J | J = Wh x 3600 | Battery and power calculations |
| MJ to kWh | kWh = MJ / 3.6 | Energy reporting |
| eV to J | J = eV x 1.602176634e-19 | Atomic and particle physics |
How it works
Energy conversion method
2. Convert to target units
target value = base value / target unit factor
The selected result and table values are calculated from the same base value.
3. Check precision
rounding depends on scale
Very small and very large values use compact scientific notation to stay readable.
FAQ
Energy converter questions
How do you convert kWh to joules?
Multiply kWh by 3,600,000 to convert kilowatt-hours to joules.
How do you convert BTU to kilojoules?
Multiply BTU by 1.05505585 to convert to kilojoules.
Is power the same as energy?
No. Energy is the amount transferred or stored, while power is the rate of energy transfer.
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