Convert energy units — joules, calories, kilowatt-hours, BTU, kilojoules.
| Unit | Name | Value |
|---|---|---|
| J | Joule | 4184 |
| kJ | Kilojoule | 4.184 |
| cal | Calorie | 1000 |
| kWh | Kilowatt-hour | 0.0011622222 |
| BTU | BTU | 3.9656512 |
Formula: Kilowatt-Hour = Kilocalorie × 0.001162
Multiply any kilocalorie value by 0.001162 to get kilowatt-hour.
Reverse: Kilocalorie = Kilowatt-Hour × 860.4
Common kilocalorie values — factor: 1 kcal = 0.001162 kWh
| Kilocalorie (kcal) | Kilowatt-Hour (kWh) | Context |
|---|---|---|
| 1 kcal | 0.001162 kWh | 1 kcal snack |
| 10 kcal | 0.01162 kWh | Small fruit |
| 50 kcal | 0.05811 kWh | Cookie |
| 100 kcal | 0.1162 kWh | Small snack |
| 200 kcal | 0.2324 kWh | Light meal |
| 500 kcal | 0.5811 kWh | Workout burn |
| 1,000 kcal | 1.162 kWh | Large meal |
| 2,000 kcal | 2.324 kWh | Daily intake |
| 2,500 kcal | 2.906 kWh | Active adult day |
| 5,000 kcal | 5.811 kWh | Marathon burn |
| 1e+04 kcal | 11.62 kWh | Ultra marathon |
| 5e+04 kcal | 58.11 kWh | Week intake |
| 1e+05 kcal | 116.2 kWh | Month intake |
| 1e+06 kcal | 1,162 kWh | Year intake |
| 1.000e+09 kcal | 1.162e+06 kWh | Decade |
kcal ÷ 860.4 = kWh. Round to ÷ 860.
Memorize: about 860 dietary calories per kWh of electricity.
kWh × 860.4 = kcal.
Prescribes daily energy intake and food portion sizes in kcal.
Calculates calorie burn during workouts and links to dietary targets.
Measures energy content of food products for nutritional labeling.
Creates weight management plans based on daily kcal targets.
Optimizes pre/during/post workout nutrition using kcal calculations.
Calculates nutritional information per serving in kcal for labels.
The kilocalorie (kcal) equals 1,000 calories or 4,184 joules, and is the unit used on food labels worldwide (often written as 'Cal' with a capital C in the US). It was standardized by the International Table calorie in 1956.
Nutritionists, dietitians, and food scientists use kcal for daily energy intake recommendations. Most adults need 2,000–2,500 kcal/day. Exercise apps, fitness trackers, and dietary plans all operate on kcal.
Interesting fact: One gram of fat yields about 9 kcal, one gram of carbohydrate or protein yields about 4 kcal. A single sugar cube (4g) contains about 16 kcal.
The kilowatt-hour (kWh) is the commercial unit of electrical energy, equal to the energy consumed by a 1,000-watt appliance in one hour (3,600,000 joules). It became standard with the growth of the electrical grid in the late 19th century.
Electricity bills worldwide are denominated in kWh. A typical household uses 300–1,000 kWh per month. An electric car uses about 15–25 kWh per 100 km. Solar panels generate 250–400 kWh per year per panel.
Interesting fact: The average price of electricity in the US is about $0.12 per kWh. One kWh can run a 100W light bulb for 10 hours, charge a smartphone about 100 times, or power a laptop for 2-3 days.
Converting kilocalorie to kilowatt-hour is common across energy, nutrition, engineering, and science. Different sectors use different energy units — joules in physics, kcal in nutrition, kWh in electricity, and BTU in HVAC — making accurate conversion essential for cross-disciplinary work and international comparisons.
Quick reference: 5 kcal = 0.005811 kWh and 10 kcal = 0.01162 kWh. Reverse: 1 kWh = 860.4 kcal. Exact factor: 1 kcal = 0.001162 kWh.
All conversions use IEEE 754 double-precision arithmetic, accurate to at least 8 significant figures.