Therm to Hartree Converter

Energy Converter

27 units available

Decimals:

From

To

2.419995e+25

1 thm = 2.419995e+25 Eh

Formula:

Eh = thm × 2.419995e+25

With your value: 1 thm = 2.419995e+25 Eh

How big is that?

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

Heartbeat (1/1.1e+8 your value)9.48e-9 thm

AA battery charge (1/1.1e+4 your value)0.0000948 thm

Slice of bread (1/3.8e+2 your value)0.00265 thm

Daily food intake (1/13 your value)0.0796 thm

Litre of petrol (1/3.1 your value)0.324 thm

Your value1.00 thm

Other Therm to Hartree conversions

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

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

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

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.

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

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 Therm to Hartree

To convert from Therm (thm) to Hartree (Eh), multiply the value by 2.419995e+25.

Formula: Eh = thm × 2.419995e+25

Reverse: thm = Eh × 4.132241e-26

Step-by-Step Example

Start with your value in Therm. For example: 5 thm
Multiply by the conversion factor: 5 x 2.419995e+25
The result is: 1.209997e+26 Eh

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.

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 Therm?

There are exactly 2.419995e+25 Hartree in 1 Therm. This means the conversion factor from Therm to Hartree is 2.419995e+25.

What is the formula to convert Therm to Hartree?

The formula to convert Therm to Hartree is: Eh = thm × 2.419995e+25. For example, to convert 10 Therm to Hartree, you would multiply 10 by 2.419995e+25.

What is a Therm?