Convert Watt-hours to Kilocalories
Convert Watt-hours to Kilocalories instantly. 1 Watt-hour (Wh) equals 0.8604 Kilocalories (kcal).
Watt-hours to Kilocalories conversion table
| Watt-hours (Wh) | Kilocalories (kcal) |
|---|---|
| 1 Wh | 0.8604 kcal |
| 2 Wh | 1.7208 kcal |
| 3 Wh | 2.5813 kcal |
| 5 Wh | 4.3021 kcal |
| 10 Wh | 8.6042 kcal |
| 20 Wh | 17.2084 kcal |
| 50 Wh | 43.021 kcal |
| 100 Wh | 86.0421 kcal |
| 500 Wh | 430.2103 kcal |
| 1,000 Wh | 860.4207 kcal |
1 Watt-hour = 0.8604 Kilocalories · multiply Watt-hours by 0.8604
About converting Watt-hours to Kilocalories
Watt-hours (Wh) and Kilocalories (kcal) are both units of energy, so converting between them is a single multiplication: multiply your Watt-hours figure by 0.8604. Ten Watt-hours comes to 8.6042 Kilocalories, and a hundred works out at 86.0421 Kilocalories.
Rule of thumb: going from Watt-hours to Kilocalories divides, so the figure always shrinks — it takes about 1.1622 Watt-hours to make a single Kilocalory. If your answer came out bigger, you have the conversion the wrong way round.
What is a Watt-hour?
A watt-hour is energy, not power, and that distinction trips people up constantly. A watt is a rate — energy per second — so a watt-hour is what you get by sustaining that rate for an hour: a quantity of energy expressed as "this much power for this long". It is the natural unit for anything that stores energy and releases it gradually, which is why phone and laptop batteries are rated in watt-hours rather than the milliamp-hours stamped on the cell, and why airlines police lithium batteries by their watt-hour rating. Capacity in watt-hours tells you how long a load can run; watts alone never can.
What is a Kilocalory?
A kilocalorie is a thousand small calories, and it is what people actually mean when they say "calories" about food. Every figure on a nutrition label, every count on a menu board and every target in a diet app is a kilocalorie, even where the label just prints "cal" — a 2,000-calorie day is 2,000 kcal, not 2,000 calories in the physicist’s sense. The convention of capitalising the food unit as Calorie was meant to mark that difference, but it survives mostly in textbooks. Most of the world prints both kJ and kcal on packaging; the United States prints calories alone, which keeps the ambiguity alive.
To put both in perspective: a phone battery holds somewhere around 15 watt-hours, while a plain bagel runs to roughly 250 kilocalories.
The converter above updates as you type, and the table lists common values for quick reference. Need the opposite direction? Use the Kilocalories to Watt-hours converter, or browse all Energy converters.
Frequently asked questions
How many Kilocalories are in one Watt-hour?
There are 0.8604 Kilocalories in one Watt-hour.
How do I convert Watt-hours to Kilocalories?
Multiply the number of Watt-hours by 0.8604. For example, 10 Watt-hours = 8.6042 Kilocalories.
What is 100 Watt-hours in Kilocalories?
100 Watt-hours is equal to 86.0421 Kilocalories.
How do I convert Kilocalories to Watt-hours?
Multiply the Kilocalories value by 1.1622 (or divide by 0.8604).
Is this Watt-hours to Kilocalories conversion exact?
The definition is exact — Watt-hours and Kilocalories are both fixed against the same base by international agreement — but the decimal shown here is rounded for readability, because the true ratio does not terminate. For engineering or scientific work, carry more decimal places than this page displays.
What is a Watt-hour?
A watt-hour is energy, not power, and that distinction trips people up constantly. A watt is a rate — energy per second — so a watt-hour is what you get by sustaining that rate for an hour: a quantity of energy expressed as "this much power for this long". It is the natural unit for anything that stores energy and releases it gradually, which is why phone and laptop batteries are rated in watt-hours rather than the milliamp-hours stamped on the cell, and why airlines police lithium batteries by their watt-hour rating. Capacity in watt-hours tells you how long a load can run; watts alone never can.
What is a Kilocalory?
A kilocalorie is a thousand small calories, and it is what people actually mean when they say "calories" about food. Every figure on a nutrition label, every count on a menu board and every target in a diet app is a kilocalorie, even where the label just prints "cal" — a 2,000-calorie day is 2,000 kcal, not 2,000 calories in the physicist’s sense. The convention of capitalising the food unit as Calorie was meant to mark that difference, but it survives mostly in textbooks. Most of the world prints both kJ and kcal on packaging; the United States prints calories alone, which keeps the ambiguity alive.