Hartree to Therm Converter

Energy Converter

27 units available

Decimals:

From

To

4.132241e-26

1 Eh = 4.132241e-26 thm

Formula:

thm = Eh × 4.132241e-26

With your value: 1 Eh = 4.132241e-26 thm

How big is that?

Everyday references on a logarithmic scale, all expressed in hartree so you can sanity-check the result.

Your value1.00 Eh

Heartbeat (2.3e+17× your value)2.29e+17 Eh

AA battery charge (2.3e+21× your value)2.29e+21 Eh

Slice of bread (6.4e+22× your value)6.42e+22 Eh

Daily food intake (1.9e+24× your value)1.93e+24 Eh

Litre of petrol (7.8e+24× your value)7.84e+24 Eh

Other Hartree to Therm conversions

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

Hartree to Therm Conversion Table

Hartree (Eh)	Therm (thm)
0.5	2.066120e-26
1	4.132241e-26
2	8.264481e-26
5	2.066120e-25
10	4.132241e-25
15	6.198361e-25
20	8.264481e-25
25	1.033060e-24
50	2.066120e-24
100	4.132241e-24
250	1.033060e-23
500	2.066120e-23
1000	4.132241e-23

Therm to Hartree Conversion Table

Therm (thm)	Hartree (Eh)
0.5	1.209997e+25
1	2.419995e+25
2	4.839989e+25
5	1.209997e+26
10	2.419995e+26
15	3.629992e+26
20	4.839989e+26
25	6.049986e+26
50	1.209997e+27
100	2.419995e+27
250	6.049986e+27
500	1.209997e+28
1000	2.419995e+28

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.

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

Therm (thm)

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 Hartree to Therm

To convert from Hartree (Eh) to Therm (thm), multiply the value by 4.132241e-26.

Formula: thm = Eh × 4.132241e-26

Reverse: Eh = thm × 2.419995e+25

Step-by-Step Example

Start with your value in Hartree. For example: 5 Eh
Multiply by the conversion factor: 5 x 4.132241e-26
The result is: 2.066120e-25 thm

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.

About Therm

The therm (thm) is a unit of energy and work. One therm equals 1.055056 × 10^+8 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 Therm are in 1 Hartree?

There are exactly 4.132241e-26 Therm in 1 Hartree. This means the conversion factor from Hartree to Therm is 4.132241e-26.

What is the formula to convert Hartree to Therm?

The formula to convert Hartree to Therm is: thm = Eh × 4.132241e-26. For example, to convert 10 Hartree to Therm, you would multiply 10 by 4.132241e-26.

What is a Hartree?