20 Rydberg to Hartree
Quick answer
20 Rydberg (Ry) equals
9.999998 Eh
To convert 20 Rydbergs to Hartrees, multiply by 0.4999999172. Therefore, 20 Rydberg (Ry) equals 9.999998 Hartree (Eh).
Formula: Eh = Ry × 0.4999999172. Calculation: 20 × 0.4999999172 = 9.999998 Eh.
Convert Rydberg (Ry) to Hartree (Eh) online with our free unit converter. In energy, 1 Ry = 0.5 Eh. Explore step-by-step conversion steps, mathematical formulas, and quick conversion reference tables below.
Worked example: converting Rydberg to Hartree
- Step 1 — start with the formula. Eh = Ry × 0.4999999172
- Step 2 — substitute your figure. 20 Ry × 0.4999999172
- Step 3 — read the result. 20 Ry = 9.999998 Eh
- Step 4 — check it in reverse. Ry = Eh × 2.0000003313 returns 20 Ry, which matches the figure you started with.
Energy Converter
27 units available
20 Ry = 9.999998 Eh
Formula:
Eh = Ry × 0.4999999172With your value: 20 Ry = 9.99999834 Eh
How big is that?
Everyday references on a logarithmic scale, all expressed in rydberg so you can sanity-check the result.
Other Rydberg to Hartree conversions
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 |
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 |
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.
Rydberg (Ry)
Energy
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
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 Rydberg to Hartree
To convert from Rydberg (Ry) to Hartree (Eh), multiply the value by 0.4999999172.
Formula: Eh = Ry × 0.4999999172
Reverse: Ry = Eh × 2.0000003313
Step-by-Step Example
- Start with your value in Rydberg. For example: 5 Ry
- Multiply by the conversion factor: 5 x 0.4999999172
- The result is: 2.5 Eh
Rydberg and Hartree Relationship
This calculation facilitates standardized conversion between recognized units of energy. Since 1 Rydberg represents a fraction of a Hartree (1 Hartree ≈ 2 Rydbergs), the Hartree is the larger measurement interval. Understanding the relationship between Rydberg and Hartree is essential for accurate calculations in physics, engineering, commerce, and daily applications.
About Rydberg
The Rydberg (symbol: Ry) is a recognized unit in the Standard measurement framework, utilized within energy applications for precision and standardized data representation.
Common uses of Rydberg: energy calculations, engineering and science, education.
About Hartree
The Hartree (symbol: Eh) is a recognized unit in the Standard measurement framework, utilized within energy applications for precision and standardized data representation.
Common uses of Hartree: energy calculations, engineering and science, education.
Frequently Asked Questions
- What is 20 Rydberg in Hartree?
- 20 Rydberg equals 9.999998 Hartree.
- How many Hartrees are in 1 Rydberg?
- There are exactly 0.4999999172 Hartrees in 1 Rydberg. This means the conversion factor from Rydberg to Hartree is 0.4999999172.
- What is the formula to convert Rydberg to Hartree?
- The formula to convert Rydberg to Hartree is: Eh = Ry × 0.4999999172. For example, to convert 10 Rydbergs to Hartrees, you would multiply 10 by 0.4999999172.
- What is a Rydberg?
- The Rydberg (symbol: Ry) is a recognized unit in the Standard measurement framework, utilized within energy applications for precision and standardized data representation.
- What is a Hartree?
- The Hartree (symbol: Eh) is a recognized unit in the Standard measurement framework, utilized within energy applications for precision and standardized data representation.
- What are the common uses of Rydberg?
- The Rydberg is commonly used in energy calculations, engineering and science, education.
Related Energy Conversions
Cite this page
UnitConvertLab. (2026). 20 Rydberg to Hartree. UnitConvertLab. Retrieved from https://unitconvertlab.com/convert/20-rydberg-to-hartree