J, kWh, BTU unit conversion
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W = F × d (1 J = 1 N·m = 1 kg·m²/s²)
1 J = 0.239006 cal
1 J = 2.77778 × 10⁻⁷ kWh
1 J = 0.000947817 BTU
1 kWh = 3,600,000 J
1 cal = 4.184 J
1 BTU = 1,055.06 J
1 eV = 1.602 × 10⁻¹⁹ J
Power (P) = Energy (E) / Time (t)
Work (W) = Force (F) × Distance (d)
Kinetic energy: KE = ½mv²
Potential energy: PE = mgh
Food Calorie (Cal) equals kilocalorie (kcal)
SI base unit. Work done by 1 N force over 1 m distance
Heat required to raise 1g of water by 1°C
Unit of energy. Energy consumed by 1 kW for 1 hour
A tool that converts between 11 different energy units in real-time, including Joule (J), kilowatt-hour (kWh), calorie (cal), BTU, and electron volt (eV). Enter a value to see conversion results for all units simultaneously.
Choose a Unit
Choose the input unit for the energy you want to convert (J, kJ, kWh, cal, and others).
Enter a Value
Enter the energy value you want to convert.
Review the Results
The value is converted and displayed in 11 units at once.
Adjust the Precision
Set the number of decimal places to view results at the precision you need.
The joule is the SI unit of energy, while the calorie is a unit of heat energy. 1 cal = 4.184 J.
No. The uppercase Calorie (Cal) used for food equals one kilocalorie (kcal), which is 1000 times a lowercase thermochemical calorie (cal).
The kilowatt-hour (kWh) is mainly used to calculate electricity charges. 1 kWh is the energy consumed by using 1000W of power for 1 hour.
A BTU (British Thermal Unit) is a unit of heat used in the United States and United Kingdom. It is the energy needed to raise 1 pound of water by 1°F. 1 BTU = 1055.06 J.
The electronvolt is used in atomic and nuclear physics to express extremely small amounts of energy. 1 eV = 1.602 × 10⁻¹⁹ J.