Calorie (th) to Hartree Converter

Energy Converter

27 units available

Decimals:

From

To

9.596892e+17

1 cal = 9.596892e+17 Eh

Formula:

Eh = cal × 9.596892e+17

With your value: 1 cal = 9.596892e+17 Eh

How big is that?

Everyday references on a logarithmic scale, all expressed in calorie (th) so you can sanity-check the result.

Heartbeat (1/4.2 your value)0.239 cal

Your value1.00 cal

AA battery charge (2.4e+3× your value)2.39e+3 cal

Slice of bread (6.7e+4× your value)6.69e+4 cal

Daily food intake (2.0e+6× your value)2.01e+6 cal

Litre of petrol (8.2e+6× your value)8.17e+6 cal

Other Calorie (th) to Hartree conversions

2 cal to Eh 3 cal to Eh 4 cal to Eh 5 cal to Eh 6 cal to Eh 7 cal to Eh 8 cal to Eh

Calorie (th) to Hartree Conversion Table

Calorie (th) (cal)	Hartree (Eh)
0.5	4.798446e+17
1	9.596892e+17
2	1.919378e+18
5	4.798446e+18
10	9.596892e+18
15	1.439534e+19
20	1.919378e+19
25	2.399223e+19
50	4.798446e+19
100	9.596892e+19
250	2.399223e+20
500	4.798446e+20
1000	9.596892e+20

Hartree to Calorie (th) Conversion Table

Hartree (Eh)	Calorie (th) (cal)
0.5	5.210020e-19
1	1.042004e-18
2	2.084008e-18
5	5.210020e-18
10	1.042004e-17
15	1.563006e-17
20	2.084008e-17
25	2.605010e-17
50	5.210020e-17
100	1.042004e-16
250	2.605010e-16
500	5.210020e-16
1000	1.042004e-15

Where these values come from

Every factor on this page is traced to the document that defines it. See the full provenance dataset or our methodology.

Calorie (th) (cal)

Energy

Exact conversion

The thermochemical calorie is exactly 4.184 J.

The International Table calorie (4.1868 J) and the 15 °C calorie differ slightly.

Source: NIST Special Publication 811, Guide for the Use of the International System of Units

National Institute of Standards and Technology (US) · Reviewed 2026-07-01

Hartree (Eh)

Energy

Exact conversion

Derived from the joule (1 J = 1 kg·m²/s²). Thermochemical and IT calories, BTU and kWh are exact defined multiples.

Source: NIST Special Publication 811, Guide for the Use of the International System of Units

National Institute of Standards and Technology (US) · Reviewed 2026-07-01

How to Convert Calorie (th) to Hartree

To convert from Calorie (th) (cal) to Hartree (Eh), multiply the value by 9.596892e+17.

Formula: Eh = cal × 9.596892e+17

Reverse: cal = Eh × 1.042004e-18

Step-by-Step Example

Start with your value in Calorie (th). For example: 5 cal
Multiply by the conversion factor: 5 x 9.596892e+17
The result is: 4.798446e+18 Eh

About Calorie (th)

The thermochemical calorie equals 4.184 joules. Not to be confused with the food Calorie (kcal), which equals 1,000 calories.

Common uses: chemistry, nutrition, heating.

About Hartree

The hartree (Eh) is a unit of energy and work. One hartree equals 4.359745 × 10^-18 joules. UnitConvertLab converts it against every other energy unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.

Common uses: energy calculations, engineering and science, education.

Frequently Asked Questions

How many Hartree are in 1 Calorie (th)?

There are exactly 9.596892e+17 Hartree in 1 Calorie (th). This means the conversion factor from Calorie (th) to Hartree is 9.596892e+17.

What is the formula to convert Calorie (th) to Hartree?

The formula to convert Calorie (th) to Hartree is: Eh = cal × 9.596892e+17. For example, to convert 10 Calorie (th) to Hartree, you would multiply 10 by 9.596892e+17.

What is a Calorie (th)?