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Joules to Kilowatt-hours Converter

Free instant J → kWh converter. No signup, no uploads — everything is calculated privately in your browser.

1 J = 2.77778e-7 kilowatt-hours

Free and instant — every calculation runs in your browser. Nothing is uploaded.

Quick Answer

1 joule equals 2.77778e-7 kilowatt-hours. To convert joules to kilowatt-hours, multiply the value by this factor.

Key Facts

  • Reverse: 1 kilowatt-hour = 3,600,000 joules.

Joules to Kilowatt-hours Formula

Formula: value ÷ 3,600,000

Prefer to skip the math? Type any value in the converter above and it converts instantly.

Joules to Kilowatt-hours Conversion Table

Joules (J)Kilowatt-hours (kWh)
1 J0.000000277778 kWh
2 J0.000000555556 kWh
5 J0.00000138889 kWh
10 J0.00000277778 kWh
25 J0.00000694444 kWh
50 J0.0000138889 kWh
100 J0.0000277778 kWh
250 J0.0000694444 kWh
500 J0.000138889 kWh
1,000 J0.000277778 kWh

Frequently Asked Questions

How do I convert joules to kilowatt-hours?

Enter the value above and the result appears instantly — the calculation runs entirely in your browser. Formula: value ÷ 3,600,000.

What is the exact joules to kilowatt-hours conversion factor?

1 joule = 2.77778e-7 kilowatt-hours (shown to 6 significant figures — the converter itself computes at full precision). The reverse factor is 1 kilowatt-hour = 3,600,000 joules.

What are some common joules to kilowatt-hours conversions?

1 J = 0.000000277778 kWh; 10 J = 0.00000277778 kWh; 100 J = 0.0000277778 kWh. Use the full conversion table below for more reference values.

Is a calorie the same as a food Calorie?

No — and the capital letter matters. A food Calorie (with a capital C) is a kilocalorie: 1,000 small calories. This converter treats them correctly: 1 kcal = 4.184 kJ = 1,000 cal. Energy labels on food almost always mean kilocalories, even where the label just says "calories".

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