21 Hartree to Kiloelectron Volt
Quick answer
21 Hartree (Eh) equals
0.571439 keV
To convert 21 Hartrees to Kiloelectron Volts, multiply by 0.0272113862. Therefore, 21 Hartree (Eh) equals 0.571439 Kiloelectron Volt (keV).
Formula: keV = Eh × 0.0272113862. Calculation: 21 × 0.0272113862 = 0.571439 keV.
Convert Hartree (Eh) to Kiloelectron Volt (keV) online with our free unit converter. In energy, 1 Eh = 0.027211 keV. Explore step-by-step conversion steps, mathematical formulas, and quick conversion reference tables below.
Worked example: converting Hartree to Kiloelectron Volt
- Step 1 — start with the formula. keV = Eh × 0.0272113862
- Step 2 — substitute your figure. 21 Eh × 0.0272113862
- Step 3 — read the result. 21 Eh = 0.571439 keV
- Step 4 — check it in reverse. Eh = keV × 36.7493221757 returns 21 Eh, which matches the figure you started with.
Energy Converter
27 units available
21 Eh = 0.571439 keV
Formula:
keV = Eh × 0.0272113862With your value: 21 Eh = 0.57143911 keV
How big is that?
Everyday references on a logarithmic scale, all expressed in hartree so you can sanity-check the result.
Other Hartree to Kiloelectron Volt conversions
Hartree to Kiloelectron Volt Conversion Table
| Hartree (Eh) | Kiloelectron Volt (keV) |
|---|---|
| 0.5 | 0.013606 |
| 1 | 0.027211 |
| 2 | 0.054423 |
| 5 | 0.136057 |
| 10 | 0.272114 |
| 15 | 0.408171 |
| 20 | 0.544228 |
| 25 | 0.680285 |
| 50 | 1.360569 |
| 100 | 2.721139 |
| 250 | 6.802847 |
| 500 | 13.605693 |
| 1000 | 27.211386 |
Kiloelectron Volt to Hartree Conversion Table
| Kiloelectron Volt (keV) | Hartree (Eh) |
|---|---|
| 0.5 | 18.374661 |
| 1 | 36.749322 |
| 2 | 73.498644 |
| 5 | 183.746611 |
| 10 | 367.493222 |
| 15 | 551.239833 |
| 20 | 734.986444 |
| 25 | 918.733054 |
| 50 | 1,837.466109 |
| 100 | 3,674.932218 |
| 250 | 9,187.330544 |
| 500 | 18,374.661088 |
| 1000 | 36,749.322176 |
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
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
Kiloelectron Volt (keV)
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 Hartree to Kiloelectron Volt
To convert from Hartree (Eh) to Kiloelectron Volt (keV), multiply the value by 0.0272113862.
Formula: keV = Eh × 0.0272113862
Reverse: Eh = keV × 36.7493221757
Step-by-Step Example
- Start with your value in Hartree. For example: 5 Eh
- Multiply by the conversion factor: 5 x 0.0272113862
- The result is: 0.136057 keV
Hartree and Kiloelectron Volt Relationship
This calculation facilitates standardized conversion between recognized units of energy. Since 1 Hartree represents a fraction of a Kiloelectron Volt (1 Kiloelectron Volt ≈ 36.7493 Hartrees), the Kiloelectron Volt is the larger measurement interval. Understanding the relationship between Hartree and Kiloelectron Volt is essential for accurate calculations in physics, engineering, commerce, and daily applications.
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.
About Kiloelectron Volt
The Kiloelectron Volt (symbol: keV) is a recognized unit in the Standard measurement framework, utilized within energy applications for precision and standardized data representation.
Common uses of Kiloelectron Volt: energy calculations, engineering and science, education.
Frequently Asked Questions
- What is 21 Hartree in Kiloelectron Volt?
- 21 Hartree equals 0.571439 Kiloelectron Volt.
- How many Kiloelectron Volts are in 1 Hartree?
- There are exactly 0.0272113862 Kiloelectron Volts in 1 Hartree. This means the conversion factor from Hartree to Kiloelectron Volt is 0.0272113862.
- What is the formula to convert Hartree to Kiloelectron Volt?
- The formula to convert Hartree to Kiloelectron Volt is: keV = Eh × 0.0272113862. For example, to convert 10 Hartrees to Kiloelectron Volts, you would multiply 10 by 0.0272113862.
- 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 is a Kiloelectron Volt?
- The Kiloelectron Volt (symbol: keV) 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 Hartree?
- The Hartree is commonly used in energy calculations, engineering and science, education.
Related Energy Conversions
Cite this page
UnitConvertLab. (2026). 21 Hartree to Kiloelectron Volt. UnitConvertLab. Retrieved from https://unitconvertlab.com/convert/21-hartree-to-kiloelectron_volt