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Energy • NIST Exact

Calories → Kilowatt-hours

cal → kWh

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NIST Exact

Based on U.S. National Institute of Standards

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Calories to Kilowatt-hours Formula

To convert from Calories to Kilowatt-hours, you can use the following formula:

Kilowatt-hours = Calories × NaN

This means you need to multiply your Calories value by NaN to get the equivalent value in Kilowatt-hours.

cal → kWh Reference Table

cal kWh
0.001 cal 1.162222e-9 kWh
0.002 cal 2.324444e-9 kWh
0.003 cal 3.486667e-9 kWh
0.004 cal 4.648889e-9 kWh
0.005 cal 5.811111e-9 kWh
0.006 cal 6.973333e-9 kWh
0.007 cal 8.135556e-9 kWh
0.008 cal 9.297778e-9 kWh
0.009 cal 1.046e-8 kWh
0.01 cal 1.162222222e-8 kWh
0.02 cal 2.324444444e-8 kWh
0.03 cal 3.486666667e-8 kWh
0.04 cal 4.648888889e-8 kWh
0.05 cal 5.811111111e-8 kWh
0.06 cal 6.973333333e-8 kWh
0.07 cal 8.135555556e-8 kWh
0.08 cal 9.297777778e-8 kWh
0.09 cal 1.046e-7 kWh
0.1 cal 1.162222222e-7 kWh
0.2 cal 2.324444444e-7 kWh
0.3 cal 3.486666667e-7 kWh
0.4 cal 4.648888889e-7 kWh
0.5 cal 5.811111111e-7 kWh
0.6 cal 6.973333333e-7 kWh
0.7 cal 8.135555556e-7 kWh
0.8 cal 9.297777778e-7 kWh
0.9 cal 0.000001046 kWh
1 cal 0.000001162222222 kWh
1.5 cal 0.000001743333333 kWh
2 cal 0.000002324444444 kWh
2.5 cal 0.000002905555556 kWh
3 cal 0.000003486666667 kWh
3.5 cal 0.000004067777778 kWh
4 cal 0.000004648888889 kWh
4.5 cal 0.00000523 kWh
5 cal 0.000005811111111 kWh
5.5 cal 0.000006392222222 kWh
6 cal 0.000006973333333 kWh
6.5 cal 0.000007554444444 kWh
7 cal 0.000008135555556 kWh
7.5 cal 0.000008716666667 kWh
8 cal 0.000009297777778 kWh
8.5 cal 0.000009878888889 kWh
9 cal 0.00001046 kWh
9.5 cal 0.00001104111111 kWh
10 cal 0.00001162222222 kWh
11 cal 0.00001278444444 kWh
12 cal 0.00001394666667 kWh
13 cal 0.00001510888889 kWh
14 cal 0.00001627111111 kWh
15 cal 0.00001743333333 kWh
16 cal 0.00001859555556 kWh
17 cal 0.00001975777778 kWh
18 cal 0.00002092 kWh
19 cal 0.00002208222222 kWh
20 cal 0.00002324444444 kWh
25 cal 0.00002905555556 kWh
30 cal 0.00003486666667 kWh
35 cal 0.00004067777778 kWh
40 cal 0.00004648888889 kWh
45 cal 0.0000523 kWh
50 cal 0.00005811111111 kWh
55 cal 0.00006392222222 kWh
60 cal 0.00006973333333 kWh
65 cal 0.00007554444444 kWh
70 cal 0.00008135555556 kWh
75 cal 0.00008716666667 kWh
80 cal 0.00009297777778 kWh
85 cal 0.00009878888889 kWh
90 cal 0.0001046 kWh
95 cal 0.0001104111111 kWh
100 cal 0.0001162222222 kWh
120 cal 0.0001394666667 kWh
125 cal 0.0001452777778 kWh
130 cal 0.0001510888889 kWh
140 cal 0.0001627111111 kWh
150 cal 0.0001743333333 kWh
160 cal 0.0001859555556 kWh
175 cal 0.0002033888889 kWh
180 cal 0.0002092 kWh
200 cal 0.0002324444444 kWh
225 cal 0.0002615 kWh
250 cal 0.0002905555556 kWh
275 cal 0.0003196111111 kWh
300 cal 0.0003486666667 kWh
350 cal 0.0004067777778 kWh
400 cal 0.0004648888889 kWh
450 cal 0.000523 kWh
500 cal 0.0005811111111 kWh
600 cal 0.0006973333333 kWh
700 cal 0.0008135555556 kWh
750 cal 0.0008716666667 kWh
800 cal 0.0009297777778 kWh
900 cal 0.001046 kWh
1000 cal 0.001162222222 kWh
1200 cal 0.001394666667 kWh
1250 cal 0.001452777778 kWh
1500 cal 0.001743333333 kWh
1750 cal 0.002033888889 kWh
2000 cal 0.002324444444 kWh
2500 cal 0.002905555556 kWh
3000 cal 0.003486666667 kWh
4000 cal 0.004648888889 kWh
4500 cal 0.00523 kWh
5000 cal 0.005811111111 kWh
6000 cal 0.006973333333 kWh
7000 cal 0.008135555556 kWh
7500 cal 0.008716666667 kWh
8000 cal 0.009297777778 kWh
9000 cal 0.01046 kWh
10000 cal 0.01162222222 kWh
15000 cal 0.01743333333 kWh
20000 cal 0.02324444444 kWh
25000 cal 0.02905555556 kWh
50000 cal 0.05811111111 kWh
75000 cal 0.08716666667 kWh
100000 cal 0.1162222222 kWh

Values based on NIST SP 811 conversion factors

Why Convert Calories to Kilowatt-hours?

Converting between calories (cal) and kilowatt-hours (kWh) is one of the most common energy conversions. Whether for engineering, cooking, travel, or science, knowing how to quickly convert cal to kWh saves time and prevents errors.

Energy conversions from cal to kWh are crucial for dietitians, physicists, and engineers. In nutrition, understanding the link between calories and joules helps individuals manage their diet and energy intake effectively. In the power sector, converting between kilowatt-hours and British Thermal Units (BTU) is necessary for sizing heating and cooling systems for homes and offices. Physicists rely on precise energy unit conversions to calculate work, heat, and thermodynamic processes. Whether tracking fitness goals or analyzing home energy bills, accurate conversion empowers users to make better health and financial decisions.

How to Convert Calories to Kilowatt-hours

To convert calories to kilowatt-hours, use the following formula:

kWh = cal × 0.000001162222222

Example: 1 cal = 0.000001162222222 kWh

For example, 5 cal = 0.000005811111111 kWh, 10 cal = 0.00001162222222 kWh, and 100 cal = 0.0001162222222 kWh. For larger values, 1000 cal = 0.001162222222 kWh. Conversely, 1 kWh = 860420.6501 cal. Our calculator above performs this conversion instantly with full precision — no rounding errors.

Common Mistakes to Avoid

  • Calorie confusion: Food 'Calories' are actually kilocalories (kcal).
  • Joule scale: 1 kWh is 3.6 million Joules (orders of magnitude difference).
  • Power vs Energy: mixing up Watts (power) and Watt-hours (energy).

Pro Tips

  • Food labels: Learn to read kcal; average adult needs ~2000 kcal/day.
  • Battery capacity: Wh = V * Ah. Useful for comparing different voltage batteries.
  • Efficiency: Energy cannot be created/destroyed, only converted (with some loss as heat).

What is a Calorie?

The calorie (cal) is a pre-SI unit of energy. Historically defined as the heat needed to raise 1 gram of water by 1°C. Food calories are actually kilocalories (kcal).

Calories (specifically kilocalories) are universally used in nutrition to measure the energy content of food and the energy expenditure of physical activity.

What is a Kilowatt-hour?

The kilowatt-hour (kWh) is a unit of energy equal to 3.6 megajoules. It represents the energy consumed by a 1,000-watt appliance running for one hour.

Kilowatt-hours are the standard unit for electricity billing worldwide. It measures residential and industrial electrical energy consumption.

Frequently Asked Questions

Energy More Conversions

kJ → kcalkcal → kJJ → calcal → JkWh → JBTU → J

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