Hartree to Rydberg Converter

Energy Converter

27 units available

Decimals:

From

To

2

1 Eh = 2 Ry

Formula:

Ry = Eh × 2.0000003313

With your value: 1 Eh = 2.00000033 Ry

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 Rydberg conversions

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

Hartree to Rydberg Conversion Table

Hartree (Eh)	Rydberg (Ry)
0.5	1
1	2
2	4.000001
5	10.000002
10	20.000003
15	30.000005
20	40.000007
25	50.000008
50	100.000017
100	200.000033
250	500.000083
500	1,000.000166
1000	2,000.000331

Rydberg to Hartree Conversion Table

Rydberg (Ry)	Hartree (Eh)
0.5	0.25
1	0.5
2	1
5	2.5
10	4.999999
15	7.499999
20	9.999998
25	12.499998
50	24.999996
100	49.999992
250	124.999979
500	249.999959
1000	499.999917

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

Rydberg (Ry)

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 Rydberg

To convert from Hartree (Eh) to Rydberg (Ry), multiply the value by 2.0000003313.

Formula: Ry = Eh × 2.0000003313

Reverse: Eh = Ry × 0.4999999172

Step-by-Step Example

Start with your value in Hartree. For example: 5 Eh
Multiply by the conversion factor: 5 x 2.0000003313
The result is: 10.000002 Ry

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 Rydberg

The rydberg (Ry) is a unit of energy and work. One rydberg equals 2.179872 × 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 Rydberg are in 1 Hartree?

There are exactly 2.0000003313 Rydberg in 1 Hartree. This means the conversion factor from Hartree to Rydberg is 2.0000003313.

What is the formula to convert Hartree to Rydberg?

The formula to convert Hartree to Rydberg is: Ry = Eh × 2.0000003313. For example, to convert 10 Hartree to Rydberg, you would multiply 10 by 2.0000003313.

What is a Hartree?