Watt-hours to Kilocalories Converter
Convert Watt-hours (Wh) to Kilocalories (kcal) instantly, or use the conversion table below to look up common values.
Watt-hours to Kilocalories conversion table
| Watt-hours (Wh) | Kilocalories (kcal) |
|---|---|
| 1 | 0.860421 |
| 2 | 1.720841 |
| 3 | 2.581262 |
| 4 | 3.441683 |
| 5 | 4.302103 |
| 10 | 8.604207 |
| 25 | 21.510516 |
| 50 | 43.021033 |
| 100 | 86.042065 |
How to convert Watt-hours to Kilocalories
1 Wh equals 0.860421 kcal. Use the converter above for any value, or read the table for common conversions.
kcal = Wh × 0.8604206500956023 · Wh = kcal × 1.1622222222222223Multiply a watt-hours figure by 0.860421 to get kilocalories, or divide it by 1.162222 to go the other way.
Worked examples
- 1 Wh= 0.860421 kcal
- 5 Wh= 4.302103 kcal
- 10 Wh= 8.604207 kcal
- 100 Wh= 86.042065 kcal
- 500 Wh= 430.210325 kcal
What these units are
Watt-hours (Wh). A watt-hour is the energy of one watt sustained for one hour — 3,600 joules. It is used for battery and power-bank capacity; a phone battery is typically 10 to 20 watt-hours.
Kilocalories (kcal). A kilocalorie is 1,000 calories, or 4,184 joules. It is the 'calorie' on food labels, so a 2,000-calorie diet means 2,000 kilocalories.
All factors are exact definitions, so only the display is rounded.
Converting Watt-hours to Kilocalories in practice
Reading the result in kilocalories
Exactly 1,000 thermochemical calories, or 4,184 joules, make one kilocalorie. A food label that prints calorie, often with a capital letter, means this unit rather than the small calorie of physics.
Food energy on packaging, diet plans, restaurant menus and sports nutrition is stated in kilocalories. Physiology and nutrition research also reports energy expenditure in the same unit.
Kilocalories convert to kilojoules by the exact factor 4.184, and to joules by 4,184, with no rounding. Since a kilowatt-hour is 3.6 megajoules, one kilocalorie is a little over 0.00116 kilowatt-hours.
The standard mistake is to treat the label's calorie as the small calorie and conclude that food holds far less energy than it does. The label unit is one thousand small calories.
The kilocalorie is the label unit, the calorie is its one-thousandth in physics, and the kilojoule is the metric equivalent at 4.184 kilojoules each. A diet figure and a physics figure therefore need different units before they can be compared.
Checking a watt-hours to kilocalories conversion
Energy units are defined against the joule, so every conversion in this dimension is a single exact multiplication by a published number rather than a chain of steps that could accumulate error.
The pair that needs care is the kilowatt-hour, because it looks like a power unit and is not. It is a watt sustained for an hour, which is why an electricity meter counts in kilowatt-hours while a generator is rated in kilowatts: one is an amount, the other is a rate, and only a duration links them.
To check an energy conversion, express both sides in joules or both in kilowatt-hours before comparing. The commonest mistake is treating a food calorie as a calorie when the label means a kilocalorie, which understates the figure a thousandfold.
Tanzania reference points
Real quantities, converted into the units on this page.
One unit of electricity on a Tanzanian prepaid meter
1 kWh = 1,000 Wh = 860.42065 kcal
The average domestic rate was about 229.59 TZS per kWh as of December 2025, including taxes and supply. That is an average across domestic customers, not the marginal rate on a bill.
Source: GlobalPetrolPrices — Tanzania electricity prices (compiled from EWURA/TANESCO tariffs) · verified 2026-09-14
Related conversions
More energy conversions you can convert instantly.