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Energy & Work Converter

Convert energy and work between joules, calories, BTU, kilowatt-hours, and more.

Convert Units

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Select a unit to convert to it.

Convert energy and work measurements between different units including joules, calories, BTU, kilowatt-hours, electron volts, and more with our professional energy converter.

What is Energy and Work Converter?

Energy is the capacity to do work. It exists in various forms including kinetic, potential, thermal, electrical, and chemical energy.

Understanding the Units

Joule (J)

SI unit of energy. One joule is the energy transferred when one newton of force moves an object one meter.

Common Uses: Physics, engineering

Calorie (cal)

Energy needed to raise 1 gram of water by 1°C.

Common Uses: Food energy (actually kilocalories)

Conversion: 1 cal = 4.184 J

Kilowatt-hour (kWh)

Energy consumed by 1 kW device in 1 hour.

Common Uses: Electricity billing

Conversion: 1 kWh = 3.6 million J

British Thermal Unit (BTU)

Energy to raise 1 pound of water by 1°F.

Common Uses: Heating/cooling systems

Conversion: 1 BTU = 1,055 J

Common Energy and Work Conversions

Example	Energy and Work
Food calorie	1 kcal = 4,184 J
Home electricity bill	1 kWh = 3,412 BTU = 3.6 MJ
AA battery	~10,000 J = 2.8 Wh = 2,390 cal
Litre of petrol	~34.2 MJ = 9.5 kWh = 32,400 BTU

Conversion Formulas

Work = Force × Distance (W = F × d)
Joules to calories: cal = J ÷ 4.184
Calories to joules: J = cal × 4.184
kWh to joules: J = kWh × 3,600,000
BTU to joules: J = BTU × 1,055.06

Practical Examples

Lifting a 1 kg book by 1 metre: requires ~9.8 joules of energy

Daily food intake: ~2,000 kcal = 8,368 kJ = 2.33 kWh

Monthly home electricity: ~300 kWh = 1,080 MJ = 1.02 million BTU

Full car fuel tank (50 L petrol): ≈1,600 MJ = 444 kWh of chemical energy

When to Use Each Unit

Joules (J): Physics and engineering calculations, mechanical work

Calories/Kilocalories: Food energy content, nutrition and diet

Kilowatt-hours (kWh): Electricity billing, appliance energy consumption

BTU: Heating and cooling systems in the United States

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