20 Rydberg to Joule
Quick answer
20 Rydberg (Ry) equals
4.359744e-17 J
To convert 20 Rydbergs to Joules, multiply by 2.179872e-18. Therefore, 20 Rydberg (Ry) equals 4.359744e-17 Joule (J).
Formula: J = Ry × 2.179872e-18. Calculation: 20 × 2.179872e-18 = 4.359744e-17 J.
Convert Rydberg (Ry) to Joule (J) online with our free unit converter. In energy, 1 Ry = 2.179872e-18 J. Explore step-by-step conversion steps, mathematical formulas, and quick conversion reference tables below.
Worked example: converting Rydberg to Joule
- Step 1 — start with the formula. J = Ry × 2.179872e-18
- Step 2 — substitute your figure. 20 Ry × 2.179872e-18
- Step 3 — read the result. 20 Ry = 4.359744e-17 J
- Step 4 — check it in reverse. Ry = J × 4.587425e+17 returns 20 Ry, which matches the figure you started with.
Energy Converter
27 units available
20 Ry = 4.359744e-17 J
Formula:
J = Ry × 2.179872e-18With your value: 20 Ry = 4.359744e-17 J
How big is that?
Everyday references on a logarithmic scale, all expressed in rydberg so you can sanity-check the result.
Other Rydberg to Joule conversions
Rydberg to Joule Conversion Table
| Rydberg (Ry) | Joule (J) |
|---|---|
| 0.5 | 1.089936e-18 |
| 1 | 2.179872e-18 |
| 2 | 4.359744e-18 |
| 5 | 1.089936e-17 |
| 10 | 2.179872e-17 |
| 15 | 3.269808e-17 |
| 20 | 4.359744e-17 |
| 25 | 5.449680e-17 |
| 50 | 1.089936e-16 |
| 100 | 2.179872e-16 |
| 250 | 5.449680e-16 |
| 500 | 1.089936e-15 |
| 1000 | 2.179872e-15 |
Joule to Rydberg Conversion Table
| Joule (J) | Rydberg (Ry) |
|---|---|
| 0.5 | 2.293713e+17 |
| 1 | 4.587425e+17 |
| 2 | 9.174851e+17 |
| 5 | 2.293713e+18 |
| 10 | 4.587425e+18 |
| 15 | 6.881138e+18 |
| 20 | 9.174851e+18 |
| 25 | 1.146856e+19 |
| 50 | 2.293713e+19 |
| 100 | 4.587425e+19 |
| 250 | 1.146856e+20 |
| 500 | 2.293713e+20 |
| 1000 | 4.587425e+20 |
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
Joule (J)
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 Joule
To convert from Rydberg (Ry) to Joule (J), multiply the value by 2.179872e-18.
Formula: J = Ry × 2.179872e-18
Reverse: Ry = J × 4.587425e+17
Step-by-Step Example
- Start with your value in Rydberg. For example: 5 Ry
- Multiply by the conversion factor: 5 x 2.179872e-18
- The result is: 1.089936e-17 J
Rydberg and Joule Relationship
This calculation facilitates standardized conversion between recognized units of energy. Since 1 Rydberg represents a fraction of a Joule (1 Joule ≈ 4.587e+17 Rydbergs), the Joule is the larger measurement interval. Understanding the relationship between Rydberg and Joule 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 Joule
The joule is the SI unit of energy. One joule equals the work done when a force of one newton moves an object one meter.
Common uses of Joule: physics, electrical engineering, chemistry.
Frequently Asked Questions
- What is 20 Rydberg in Joule?
- 20 Rydberg equals 4.359744e-17 Joule.
- How many Joules are in 1 Rydberg?
- There are exactly 2.179872e-18 Joules in 1 Rydberg. This means the conversion factor from Rydberg to Joule is 2.179872e-18.
- What is the formula to convert Rydberg to Joule?
- The formula to convert Rydberg to Joule is: J = Ry × 2.179872e-18. For example, to convert 10 Rydbergs to Joules, you would multiply 10 by 2.179872e-18.
- 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 Joule?
- The joule is the SI unit of energy. One joule equals the work done when a force of one newton moves an object one meter.
- 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 Joule. UnitConvertLab. Retrieved from https://unitconvertlab.com/convert/20-rydberg-to-joule