Ha to eV Converter - Hartree to Electron Volt
Hartree (Ha) to Electron Volt (eV)
Direct answer
1 Ha = 27.211386246 eV
eV = Ha × 27.211386246
Converter
Conversion formula
eV = Ha × 27.211386246
Ha = eV × 0.036749322176
Example: 10 Ha = 10 × 27.211386246 = 272.11386246 eV.
Common conversion table
| Ha | eV |
|---|---|
| 1 Ha | 27.211386246 eV |
| 2 Ha | 54.422772492 eV |
| 5 Ha | 136.05693123 eV |
| 10 Ha | 272.11386246 eV |
| 20 Ha | 544.22772492 eV |
| 50 Ha | 1,360.5693123 eV |
| 100 Ha | 2,721.1386246 eV |
| 1,000 Ha | 27,211.386246 eV |
Conversion derivation
Express both Ha and eV in the same base unit J (joule), then cancel the shared base unit.
- 1
Rewrite Ha in the base unit
- 2
Rewrite eV in the base unit
- 3
Forward conversion
- 4
Reverse conversion
AI explanation for this conversion
This pre-generated explanation is schema-checked. Numeric results still come from the page formula and calculator.
Hartree to Electron Volt Conversion
This conversion factor holds because both the hartree and the electron volt are defined as multiples of the same base unit, the joule. By expressing each unit in joules and dividing, the common base unit cancels, leaving the ratio of their defined values.
Definition
The hartree (Ha) is an atomic unit of energy, defined as approximately 4.3597447222071e-18 joules. The electron volt (eV) is a unit of energy defined as the amount of kinetic energy gained by a single electron accelerating from rest through an electric potential difference of one volt, which is approximately 1.602176634e-19 joules.
Principle
The conversion principle is a direct ratio. To convert from hartrees to electron volts, you multiply by the conversion factor derived from the ratio of their definitions in joules. This factor is approximately 27.211386246.
Assumptions
- The conversion factor is based on the exact defined values of the hartree and the elementary charge in joules.
- The result uses the standard definitions where 1 eV equals the energy gained by an electron over a potential difference of 1 volt.
Cautions
- The conversion factor is given to a high precision. For practical use, you should round the result to the number of significant figures appropriate for your input values.
- This explanation does not recalculate or verify the numeric factor; it is based solely on the provided context.
FAQ
How many eV are in 1 Ha?
1 Ha = 27.211386246 eV.
How many eV are in 10 Ha?
10 Ha = 272.11386246 eV.
How many eV are in 100 Ha?
100 Ha = 2,721.1386246 eV.
What is the formula to convert Ha to eV?
Use eV = Ha × 27.211386246.
How many Ha are in 1 eV?
1 eV = 0.036749322176 Ha.
What should I check when converting Ha to eV?
Use the conversion factor and round the result to the precision required by your calculation.