Energy Converter

Use this tool to convert between different units of energy, such as Joules, Calories, Kilowatt-hours, and more.

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Common Energy Conversions

Joules to Calories J → cal
kWh to Joules kWh → J
Calories to Joules cal → J
kcal to kJ kcal → kJ

What is Energy Conversion?

Energy conversion is the process of converting energy measurements from one unit to another. Our energy converter tool supports multiple units including Joules, Calories, Kilowatt-hours, and BTU, making it easy to switch between metric and imperial systems for nutrition labels, electricity billing, heating calculations, and scientific work.

The Joule (J) is the SI unit of energy, commonly used in physics and engineering. Calories (cal) are primarily used for food energy content. Kilowatt-hours (kWh) are used for electrical energy consumption billing. BTU is used in heating and air conditioning systems. Quick conversion between these units is essential for understanding food nutrition, calculating electricity costs, comparing heating systems, and scientific experiments.

Simply enter your value in the "From" field, select the original unit, choose your target unit in the "To" field, and the converter will instantly display the converted result along with the conversion formula.

Energy Conversion Examples

Food Nutrition Example

Converting food energy values:

  • 100 Calories = 418.4 Joules
  • 500 kcal = 2,092 kJ
  • 200 kcal = 836.8 kJ

Electricity Billing Example

Converting electrical energy usage:

  • 1 kWh = 3,600,000 Joules
  • 500 kWh = 1,800,000,000 Joules
  • 100 kWh = 360,000,000 Joules

Heating Example

Converting heating energy:

  • 1 BTU = 1,055.06 Joules
  • 10,000 BTU = 2.93 kWh
  • 100 kJ = 95.02 BTU

Frequently Asked Questions

How do I convert Joules to Calories?

To convert Joules to Calories, divide the Joule value by 4.184. For example, 418 J ÷ 4.184 = 100 Calories.

How many Joules are in a kWh?

One kilowatt-hour equals exactly 3,600,000 Joules. This is a standard conversion used for electrical energy.

How do I convert BTU to Joules?

To convert BTU to Joules, multiply the BTU value by 1,055.06. For example, 10,000 BTU × 1,055.06 = 10,550,600 Joules.

What is the difference between Calorie and kilocalorie?

One kilocalorie (kcal) equals 1,000 Calories (cal). Food labels typically show Calories, which are actually kilocalories. Both represent the same amount of energy.

What is the formula for converting kWh to Joules?

To convert kilowatt-hours to Joules, multiply the kWh value by 3,600,000. For example, 2 kWh × 3,600,000 = 7,200,000 Joules.