Energy Converter

Convert between chemical, electrical and physical energy units.

Energy
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Related Conversions
5 J to cal 25 J to cal 50 J to cal 100 J to cal 250 J to cal 500 J to cal 1,000 J to cal 2,500 J to cal 10,000 J to cal 25,000 J to cal 50,000 J to cal 100,000 J to cal
Reverse Conversions
1 cal to J 10 cal to J 25 cal to J 50 cal to J 100 cal to J 250 cal to J 500 cal to J 1,000 cal to J 5,000 cal to J 10,000 cal to J 25,000 cal to J 50,000 cal to J
More Energy Conversions
100 kJ to kcal 1 GJ to kWh 1 GJ to MJ 1 MJ to BTU 250 kcal to kJ 1 MJ to kWh 2 GJ to MJ 2 MJ to BTU 500 kJ to kcal 1 kWh to cal

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Recent Tools

Popular Conversions

Kilowatt-Hours to Megajoules Megajoules to Kilowatt-Hours Joules to Calories Kilocalories to Kilojoules British Thermal Units to Joules Watt-Hours to Joules

Common Benchmarks

Cup of coffee 5 kJ
Laptop full charge 200 kJ
Slice of bread 330 kJ
Gasoline liter 34 MJ
100 W bulb for 1 hour 0.1 kWh
Phone battery 40 kJ

Frequently Asked Questions

How do you convert joules to calories?

Divide joules by 4.184 to get calories.

How many joules are in 1 kWh?

1 kilowatt-hour equals 3.6 million joules.

How do you convert calories to joules?

Multiply calories by 4.184 to get joules.

What energy units can I convert here?

This converter supports joules, kilojoules, watt-hours, kilowatt-hours, calories, kilocalories, BTU, electronvolts, and more.

What is a kilowatt-hour?

A kilowatt-hour is a unit of energy commonly used for electricity usage and billing.

How many calories are in 100 joules?

100 joules are about 23.9 small calories.

Can I convert BTU and kWh here?

Yes. This converter supports both BTU and kilowatt-hours.

Is energy conversion useful for electricity and heating?

Yes. Energy conversion is useful for power usage, food energy, physics, and heating systems.

What’s the difference between a calorie and a Calorie?

A small calorie (cal) is used in physics. A food Calorie (Cal) is a kilocalorie: 1 Cal = 1 kcal = 4,184 J.

How many BTU are in 1 kWh?

1 kWh is about 3,412.14 BTU (IT).

About Energy

Energy describes the capacity to do work and appears in electrical, thermal, nutritional, and mechanical contexts.

Use energy conversion for utility billing, thermal balances, food energy references, and equipment efficiency comparisons.

Supported units
J • kJ • MJ • GJ • cal • kcal • Wh • kWh • BTU