Hartree to Electron Volt Converter

Energy Converter

27 units available

Decimals:

From

To

27.211386

1 Eh = 27.211386 eV

Formula:

eV = Eh × 27.211386246

With your value: 1 Eh = 27.21138625 eV

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 Electron Volt conversions

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

Hartree to Electron Volt Conversion Table

Hartree (Eh)	Electron Volt (eV)
0.5	13.605693
1	27.211386
2	54.422772
5	136.056931
10	272.113862
15	408.170794
20	544.227725
25	680.284656
50	1,360.569312
100	2,721.138625
250	6,802.846561
500	13,605.693123
1000	27,211.386246

Electron Volt to Hartree Conversion Table

Electron Volt (eV)	Hartree (Eh)
0.5	0.018375
1	0.036749
2	0.073499
5	0.183747
10	0.367493
15	0.55124
20	0.734986
25	0.918733
50	1.837466
100	3.674932
250	9.187331
500	18.374661
1000	36.749322

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

Electron Volt (eV)

Energy

Exact conversion

1 eV = 1.602 176 634 × 10⁻¹⁹ J exactly, since the elementary charge is now fixed.

Source: CODATA Internationally Recommended Values of the Fundamental Physical Constants (2022 adjustment)

CODATA / NIST · Reviewed 2026-07-01

How to Convert Hartree to Electron Volt

To convert from Hartree (Eh) to Electron Volt (eV), multiply the value by 27.211386246.

Formula: eV = Eh × 27.211386246

Reverse: Eh = eV × 0.0367493222

Step-by-Step Example

Start with your value in Hartree. For example: 5 Eh
Multiply by the conversion factor: 5 x 27.211386246
The result is: 136.056931 eV

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 Electron Volt

The electron volt (eV) is a unit of energy and work. One electron volt equals 1.602177 × 10^-19 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 Electron Volt are in 1 Hartree?

There are exactly 27.211386246 Electron Volt in 1 Hartree. This means the conversion factor from Hartree to Electron Volt is 27.211386246.

What is the formula to convert Hartree to Electron Volt?

The formula to convert Hartree to Electron Volt is: eV = Eh × 27.211386246. For example, to convert 10 Hartree to Electron Volt, you would multiply 10 by 27.211386246.

What is a Hartree?