Convert Calorie to Kilowatt-Hour (cal → kWh)

The calorie is the chemistry energy unit, equal to 4.184 joules and used in thermochemistry calculations.

Calorie

Kilowatt-Hour

0.00000116222

1 cal0.00000116222 kWhNIST · BIPM accuracy

Calorie to Kilowatt-Hour Conversion Table

10 common values

Calorie	Kilowatt-Hour
1 cal	0.000001162 kWh
10 cal	0.00001162 kWh
100 cal	0.000116 kWh
500 cal	0.000581 kWh
1,000 cal	0.001162 kWh
5,000 cal	0.005811 kWh
10,000 cal	0.011622 kWh
50,000 cal	0.058111 kWh
100,000 cal	0.116222 kWh
500,000 cal	0.581111 kWh

How to Convert Calorie to Kilowatt-Hour Manually

Step by Step

Converting calories to kilowatt-hours is straightforward: multiply by the conversion factor. Follow these three steps to do it by hand or in your head.

1
Take your value in calories
Start with the number of calories (cal) you want to convert.
2
Multiply by 0.000001162
The conversion factor from cal to kWh is 0.000001162. Multiply your value by this number.
3
Read the result in kilowatt-hours
The result is your value in kilowatt-hours (kWh).

Practical Examples

1 cal

equals

0.000001162 kWh

5 cal

equals

0.000005811 kWh

10 cal

equals

0.00001162 kWh

25 cal

equals

0.00002906 kWh

100 cal

equals

0.000116 kWh

Formula

Multiply the value in calories by 0.000001162. For the reverse direction, multiply by 860,420.65.

ForwardkWh = cal × 0.000001162

Reversecal = kWh × 860,420.65

Example: 10 cal × 0.000001162 = 0.00001162 kWh

Tips

Use these in everyday conversions

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

Common Mistakes

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).

About Calorie and Kilowatt-Hour

What is the Calorie?

The calorie equals exactly 4.184 joules (the 'thermochemical calorie') and is the historical unit for heat in chemistry and physics. It was originally defined as the heat needed to raise 1 gram of water by 1°C (a definition that varied slightly with starting temperature, hence multiple 'calories' — 4.184 J was set as the exact thermochemical convention). The calorie is widely used in older physics and chemistry literature for reaction energies, specific heat capacities, and thermodynamic calculations. Note: this 'small calorie' (lowercase c) is 1/1000 of the food Calorie (capital C) used in nutrition. The chemistry calorie relates to the joule (4.184 J = 1 cal), the kilocalorie (1,000 cal = 1 kcal = 1 food Calorie), and the BTU (1 BTU ≈ 252 cal). Modern SI usage in scientific publications has largely replaced the calorie with the joule, but it persists in medical and chemistry contexts.

Thermodynamics and older physics texts
Chemistry energy calculations
Some engineering heat-transfer contexts

Real-world examples

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

What is the Kilowatt-Hour?

The kilowatt-hour equals 1,000 watt-hours (3.6 megajoules) and is the universal billing unit for residential electricity consumption around the world. A typical US household uses about 800–1,000 kWh per month; a refrigerator consumes 1–2 kWh per day, an LED bulb at 10 W for 10 hours uses 0.1 kWh, and a Tesla Model 3 has a 75 kWh battery (about 250–350 miles of range). Electric utility rates are quoted in cents per kWh — typical US residential rates are 11–25 ¢/kWh, while industrial rates are lower. The kilowatt-hour is essential in renewable-energy planning: solar panel output, wind farm production, and grid-scale storage are all rated in kWh or MWh (megawatt-hours). It relates to the watt-hour (1,000 Wh = 1 kWh), the joule (1 kWh = 3.6 MJ), the BTU (1 kWh ≈ 3,412 BTU), and the megawatt-hour (1,000 kWh = 1 MWh).