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Converters

Energy Converter

Convert energy quantities between joules, watt-hours and thermochemical calories.

Conversion factors explained belowNo live data needed
Conversion workspace
Conversion workspace

Check the quantity, source unit and destination unit.

See the method

Choose units and a value

Runs on your device

Your converted value

Your result

Let’s calculate.

Use the Calculate button to see your result.

Review the method below for assumptions and conventions.

How to use this converter

  1. Enter value, from, to.
  2. Select Calculate to view the result.
  3. Check the method and assumptions below before using the result.

Input reference and sample values

Use the units and choices shown for each field. Sample values are provided for practice, not as recommendations.

InputFormat and unitsSample
ValueNumeric value. Zero or positive.1
FromChoose J / kJ / Wh / kWh / cal / kcal.kWh
ToChoose J / kJ / Wh / kWh / cal / kcal.J

Result for these sample inputs

3600000 J
Conversion factor
3600000

Select Try the example in the form to load these values and calculate them again. This replaces the current form inputs. Compare the result with the method and worked explanation below.

The method, explained

Convert to the base unit, then divide by the target factor. One watt-hour is 3,600 joules. One thermochemical calorie is 4.184 joules.

A WORKED EXAMPLE

1 kWh = 3,600,000 J; 1 kcal = 4,184 J.

What to keep in mind

Calories here are thermochemical calories. The tool converts energy, not power or food composition.

Common questions

Is a food Calorie a small calorie?

A nutritional Calorie usually means a kilocalorie: 1,000 small calories.

Can I convert watts into joules?

Only with a time interval. Constant power multiplied by time gives energy.

Methodology maintained by ClarityKit. How these tools are built and checked.