Convert energy units — joules, calories, kilowatt-hours, BTU, kilojoules.
| Unit | Name | Value |
|---|---|---|
| J | Joule | 3600000 |
| kJ | Kilojoule | 3600 |
| cal | Calorie | 860420.65 |
| kcal | Kilocalorie (Cal) | 860.42065 |
| BTU | BTU | 3412.1282 |
Formula: Kilocalorie = Kilowatt-Hour × 860.4
Multiply any kilowatt-hour value by 860.4 to get kilocalorie.
Reverse: Kilowatt-Hour = Kilocalorie × 0.001162
Common kilowatt-hour values — factor: 1 kWh = 860.4 kcal
| Kilowatt-Hour (kWh) | Kilocalorie (kcal) | Context |
|---|---|---|
| 0.001 kWh | 0.8604 kcal | 1 Wh |
| 0.01 kWh | 8.604 kcal | 10 Wh |
| 0.1 kWh | 86.04 kcal | Phone charge |
| 0.5 kWh | 430.2 kcal | Half kWh |
| 1 kWh | 860.4 kcal | 1 kWh |
| 5 kWh | 4,302 kcal | 5 kWh |
| 10 kWh | 8,604 kcal | Washing machine |
| 30 kWh | 2.581e+04 kcal | Daily home use |
| 100 kWh | 8.604e+04 kcal | Monthly fraction |
| 500 kWh | 4.302e+05 kcal | EV range |
| 1,000 kWh | 8.604e+05 kcal | Monthly home |
| 1e+04 kWh | 8.604e+06 kcal | Annual home |
| 1e+05 kWh | 8.604e+07 kcal | Large commercial |
| 1e+06 kWh | 8.604e+08 kcal | Small factory |
| 1.000e+09 kWh | 8.604e+11 kcal | Power plant day |
kWh × 860.4 = kcal. Round to × 860.
One kWh ≈ 860 dietary calories — less than half a day's food.
kcal ÷ 860.4 = kWh.
Reads monthly bills and compares appliance energy use in kWh.
Sizes solar systems based on kWh consumption and production estimates.
Tracks charging cost and range efficiency in kWh per 100 km.
Measures building energy consumption and identifies savings in kWh.
Plans grid capacity, demand response, and billing in kWh and MWh.
Monitors real-time appliance consumption in kWh via smart meters.
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.
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.
Converting kilowatt-hour to kilocalorie 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 kWh = 4302 kcal and 10 kWh = 8604 kcal. Reverse: 1 kcal = 0.001162 kWh. Exact factor: 1 kWh = 860.4 kcal.
All conversions use IEEE 754 double-precision arithmetic, accurate to at least 8 significant figures.