Unit conversion / Energy

Energy converter

Calories use the thermochemical definition. A food Calorie corresponds to a kilocalorie. A kilowatt-hour measures energy, not power.

THE CONVERTER

Energy

Instant results

THE WORKING

1 J = 2.77777777778e-7 kWh

12 significant digits

THE COLLECTION

What are you measuring?

12 ways to find your answer

AT A GLANCE

Energy reference

Calories use the thermochemical definition. A food Calorie corresponds to a kilocalorie. A kilowatt-hour measures energy, not power.

Selected value in every energy unit
Unit	Equivalent
JoulesJ	1
KilojouleskJ	0.001
Watt-hoursWh	0.000277777777778
Kilowatt-hourskWh	2.77777777778e-7
Thermochemical caloriescal	0.239005736138
Thermochemical kilocalorieskcal	0.000239005736138
BTU (International Table)BTU IT	0.000947817120313

A LITTLE CONTEXT

From a number
to an answer.

Choose the right family

Length, weight, temperature and more. Units must measure the same kind of quantity.

Set your units

Choose where you're starting and where you want to go. Use the arrows to swap direction.

See the whole picture

Read the result, check the working, or compare your value across the reference table.

How precise are the results?

We display up to 12 significant digits. Very small or large values use scientific notation. Floating-point arithmetic and rounded definitions can introduce small differences.

Does this work without JavaScript?

Yes. Enter your value, choose your units and press Convert. With JavaScript, the result and table update as you type.

Can I convert between different families?

Only units of the same quantity can be converted directly. For example, converting liters to kilograms requires the material's density.