Energy Unit Converter
Convert engineering quantities quickly and consistently.
Quick Access:
Manual Conversion Shortcut
Select units to view formula.
Equivalent Units
Select a quantity to see equivalents.
Standard Reference Tables
SI System
| SI Unit | Equivalent |
|---|---|
| 1 Joule (J) | 1 N·m = 1 kg·m²/s² |
| 1 Kilojoule (kJ) | 1,000 J |
FPS System
| FPS Unit | Equivalent |
|---|---|
| 1 Btu (IT) | 778.17 ft·lbf = 1055.06 J |
| 1 ft·lbf | 1.3558 Joules |
CGS System
| CGS Unit | Equivalent |
|---|---|
| 1 Erg | 1 dyne·cm |
| 1 Erg | 10⁻⁷ Joules |
Energy
What is Energy?
In thermodynamics, energy is the quantitative capacity of a system to perform work or generate heat. The First Law of Thermodynamics dictates that energy cannot be created or destroyed, making energy conversion the core of utility and power plant design.
Energy conversions are utilized to calculate:
- Thermodynamic States: Evaluating specific enthalpy and internal energy.
- Fuel Consumption: Determining the heating value (LHV/HHV) of combusted gases.
- Utility Sizing: Sizing boilers, fired heaters, and chillers.
Use this converter to seamlessly translate between Joules (J), British Thermal Units (Btu), Kilocalories (kcal), and Kilowatt-hours (kWh).