Convert calories to watt-hours

1 cal=0.001162Wh

Use the converter below to change any calories value into watt-hours instantly — with formula, conversion table, and real-world examples.

You have

Equals

0.0011622

Conversion formula

Forward

watt-hours = calories × 0.001162

Reverse

calories = watt-hours × 860.421

Example: 10 cal × 0.001162 = 0.01162 Wh.

About both units

From

Calorie

cal

The gram calorie (small calorie) equals 4.184 joules — the energy to raise 1 g of water by 1 °C. It is a scientific unit, distinct from the nutrition "Calorie" (kcal). Largely replaced by joules in modern science.

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

Read full calorie reference →

Watt-Hour

The watt-hour equals 3600 joules — 1 W delivered for 1 hour. Used for phone, laptop and small-battery capacities. A typical smartphone battery is 10–20 Wh; a laptop is 50–100 Wh.

Real-world: iPhone battery: 12 Wh. MacBook Pro: 70 Wh. Power bank: 20 Wh–100 Wh. Airplane carry-on limit: usually 100 Wh.

Read full watt-hour reference →

Calorie to Watt-Hour conversion table

Common calories to watt-hours values for quick reference.

Calorie (cal)	Watt-Hour (Wh)
1 cal	0.001162 Wh
10 cal	0.01162 Wh
100 cal	0.1162 Wh
500 cal	0.5811 Wh
1,000 cal	1.16222 Wh
5,000 cal	5.81111 Wh
10,000 cal	11.6222 Wh
50,000 cal	58.1111 Wh
100,000 cal	116.222 Wh
500,000 cal	581.111 Wh

Tips & common mistakes

Quick tips

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

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).

Frequently asked questions

How many watt-hours in a calorie?

One calorie equals 0.001162 watt-hours.

How do I convert calories to watt-hours?

Multiply the calorie value by 0.001162 to get the equivalent in watt-hours.

What is 100 calories in watt-hours?

100 calories equals 0.1162 watt-hours.

Is a calorie bigger than a watt-hour?

No. 1 calorie equals 0.001162 watt-hours, so one calorie is smaller.

How to convert calories to watt-hours without a calculator?

Multiply by 0 for a quick estimate; use a calculator for precise results.

Related energy conversions

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