Convert calories to kilowatt-hours

1 cal=1.1622e-6kWh

Use the converter below to change any calories value into kilowatt-hours instantly — with formula, conversion table, and real-world examples.

You have

Equals

1.1622e-6

Conversion formula

Forward

kilowatt-hours = calories × 1.1622e-6

Reverse

calories = kilowatt-hours × 860,420.65

Example: 10 cal × 1.1622e-6 = 1.1622e-5 kWh.

About both units

From

Calorie

cal

The gram calorie (small calorie) equals 4.184 joules — the energy to raise 1 g of water by 1 °C. It is a scientific unit, distinct from the nutrition "Calorie" (kcal). Largely replaced by joules in modern science.

Real-world: Raising 1 g of water 1 °C: 1 cal. A 100 kcal snack = 100,000 small calories.

Read full calorie reference →

Kilowatt-Hour

kWh

The kilowatt-hour equals 3.6 megajoules — energy delivered by 1 kW for 1 hour. It is the standard unit on electricity bills worldwide. A UK home uses about 2900 kWh/year; an EV charge adds 10–80 kWh depending on battery.

Real-world: UK home: ~2900 kWh/year. Tesla Model 3 battery: 60–80 kWh. Typical EV efficiency: 15–20 kWh/100 km.

Read full kilowatt-hour reference →

Calorie to Kilowatt-Hour conversion table

Common calories to kilowatt-hours values for quick reference.

Calorie (cal)	Kilowatt-Hour (kWh)
1 cal	1.1622e-6 kWh
10 cal	1.1622e-5 kWh
100 cal	0.0001162 kWh
500 cal	0.0005811 kWh
1,000 cal	0.001162 kWh
5,000 cal	0.005811 kWh
10,000 cal	0.01162 kWh
50,000 cal	0.05811 kWh
100,000 cal	0.1162 kWh
500,000 cal	0.5811 kWh

Tips & common mistakes

Quick tips

1 cal = 4.184 J. 1 kcal = 4184 J.
Scientific "calorie" and nutrition "Calorie" differ by 1000×.
Prefer joules in modern scientific writing.

Avoid these

Assuming "calories" on food labels means gram calories — they are kcal.
Mixing gram calories and kilocalories in calculations.
Confusing calorie (energy) with calorimeter (apparatus).

Frequently asked questions

How many kilowatt-hours in a calorie?

One calorie equals 1.1622e-6 kilowatt-hours.

How do I convert calories to kilowatt-hours?

Multiply the calorie value by 1.1622e-6 to get the equivalent in kilowatt-hours.

What is 100 calories in kilowatt-hours?

100 calories equals 0.0001162 kilowatt-hours.

Is a calorie bigger than a kilowatt-hour?

No. 1 calorie equals 1.1622e-6 kilowatt-hours, so one calorie is smaller.

How to convert calories to kilowatt-hours without a calculator?

Multiply by 0 for a quick estimate; use a calculator for precise results.

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