Energy & Work Converter

Convert Joules, Kilojoules, Calories, Kilocalories, Kilowatt-hours (kWh), and BTU

Amount to Convert

From

Calculation Result

Converted Value

0.001 kJ

1 Joule = 0.001 kJ

Input Unit

Joule (J)

Target Unit

Kilojoule (kJ)

All ENERGY Unit Equivalents

Equivalent values for 1 J across standard units

Joule1 J

Kilojoule0.001 kJ

Calorie0.239006 cal

Kilocalorie0.000239 kcal

Watt-hour0.000278 Wh

Kilowatt-hour0 kWh

British Thermal Unit0.000948 BTU

How this calculator works

Select your energy units.

View conversions across scientific and commercial energy metrics.

Formula & Mathematics

Energy Equivalents

1 kWh = 3.6 × 10⁶ Joules = 860.42 kcal = 3,412.14 BTU

Converts thermodynamic, electrical, and dietary energy units.

Worked Example

Convert 2,000 Food Calories (kcal) to Joules

2,000 kcal.

• 1 kcal = 4,184 Joules

• 2,000 × 4,184 = 8,368,000 Joules (8.37 MJ)

2,000 kcal = 8,368 kJ.

Frequently Asked Questions

No, a food Calorie (with capital C) is actually a kilocalorie (1,000 scientific calories).

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