How many kwhs are in 1 calorie?

1 calorie equals 0.0000011622 kwhs, using the exact defined conversion factor rather than an estimate.

How do I convert calorie to kwh?

Multiply the calorie value by 0.000001162222222. The converter above does this instantly to whatever precision you set.

How do I convert kwh back to calorie?

Use the reverse factor: 1 kwh equals 860,420.6501 calories. You can also use the swap control in the converter above to flip the direction instantly.

Is the calorie to kwh conversion exact?

Yes. A kilowatt-hour is the energy of one kilowatt of power sustained for one hour: exactly 3,600,000 joules. That fixed definition is what the converter above uses, so any rounding you see is a display choice, not a limitation of the math.

Calories to kWhs Converter

Q: What is a calorie?

Calorie (cal) measures energy. The thermochemical calorie used in this converter is defined as exactly 4.184 joules. It is classified as a Non-SI unit (limited use with SI).

Q: What is a kwh?

kWh (kWh) measures energy. A kilowatt-hour is the energy of one kilowatt of power sustained for one hour: exactly 3,600,000 joules. It is classified as a Non-SI unit accepted for use with SI.

About Converting Calories to kWhs

Calorie and kWh both measure a quantity used in structural or mechanical engineering — commonly stress, pressure, force, torque, power, or energy — where converting between the unit conventions used in different regions, industries, or equipment specifications is a routine part of design work. Calorie is typically associated with nutrition labeling in the US and several other countries still commonly uses the kilocalorie (as 'Calorie'), while kWh is typically associated with used worldwide for electricity billing.

Formula

kwhs = calories × 0.00000116222222222

This factor comes from each unit's defined relationship to the category's base unit: 1 calorie equals 4.184 base units, and 1 kwh equals 3600000 base units, so dividing one by the other gives the direct calorie-to-kwh factor of 0.00000116222222222.

Simple example

1 cal × 0.000001162222222 = 0.0000011622 kWh

1 calorie = 0.0000011622 kwhs.

Real-world example

100 cal × 0.000001162222222 = 0.0001162222 kWh

100 calories = 0.0001162222 kwhs.

Conversion table

Calorie (cal)	kWh (kWh)
1 cal	0.0000011622 kWh
10 cal	0.0000116222 kWh
50 cal	0.0000581111 kWh
100 cal	0.0001162222 kWh
500 cal	0.0005811111 kWh
1,000 cal	0.0011622222 kWh

Reverse conversion: kWh to Calorie

0.0000011622 kWh × 860420.6501 = 0.9999808795 cal

0.0000011622 kwhs = 0.9999808795 calories.

calories = kwhs × 860420.650096

For a page dedicated to this direction, see kWh to Calorie.

Calorie vs. kWh

Aspect	Calorie	kWh
Family	Non-SI unit (limited use with SI)	Non-SI unit accepted for use with SI
Typical use	Food energy labeling (as kilocalories, often written 'Calories')	Residential and commercial electricity billing worldwide
Where it's used	Nutrition labeling in the US and several other countries still commonly uses the kilocalorie (as 'Calorie')	Used worldwide for electricity billing

Understanding the Calorie

Calorie (cal) measures energy. The thermochemical calorie used in this converter is defined as exactly 4.184 joules. It is classified as a Non-SI unit (limited use with SI).

Where it's used: Nutrition labeling in the US and several other countries still commonly uses the kilocalorie (as 'Calorie')

Calorie vs. Calorie (kilocalorie). Food labels' capitalized 'Calorie' is actually one kilocalorie (1,000 small calories) — a long-standing labeling convention that causes frequent confusion.

Uses of the Calorie today

Food energy labeling (as kilocalories, often written 'Calories')
Historical chemistry and thermodynamics contexts

History of the Calorie

The calorie was originally defined in the early 19th century as the heat needed to raise one gram of water by one degree Celsius, but different scientific traditions defined it at slightly different reference temperatures, producing several close but non-identical 'calorie' values historically (15 °C calorie, mean calorie, thermochemical calorie).

To resolve this ambiguity, the thermochemical calorie was fixed by convention at exactly 4.184 joules; the very similar International Table calorie is fixed at exactly 4.1868 joules. The nutritional 'Calorie' seen on food labels is actually a kilocalorie (1,000 calories).

Historical origin. Calorie was not the invention of a single named person; it developed through the process described above.

Understanding the kWh

kWh (kWh) measures energy. A kilowatt-hour is the energy of one kilowatt of power sustained for one hour: exactly 3,600,000 joules. It is classified as a Non-SI unit accepted for use with SI.

Where it's used: Used worldwide for electricity billing

Uses of the kWh today

Residential and commercial electricity billing worldwide
Battery capacity ratings (especially electric vehicles)
Energy policy and grid-scale power statistics

History of the kWh

The kilowatt-hour became the standard electricity billing unit as power utilities expanded in the late 19th and early 20th centuries, since it conveniently matches the scale of typical household electricity consumption, unlike the much smaller joule.

Historical origin. kWh was not the invention of a single named person; it developed through the process described above.

Calorie — sources

NIST Special Publication 811 — Documents the thermochemical calorie's exact joule equivalence.

kWh — sources

BIPM SI Brochure — Non-SI units accepted for use with SI — Lists the kilowatt-hour among accepted non-SI energy units.

Calories to kWhs Converter — cal to kWh

Engineering Converter