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Electronvolt Converter

Convert electronvolts to joules, calories, kilowatt-hours and other energy units used in physics and chemistry.

What this tool does

Convert electronvolts to joules, calories, kilowatt-hours and other energy units used in physics and chemistry. Type an amount in electronvolts, choose the units, and the tool converts it to joules. It offers 13 energy units and also shows the same amount in the others.

Inputs

  • Value: A number.
  • From: Choose one from 13 options, including Electronvolt, Kiloelectronvolt, Megaelectronvolt, Gigaelectronvolt, Joule, Kilojoule. Starts as Electronvolt.
  • To: Choose one of the same 13 units as "From". Starts as Joule.

How to use

  1. Enter the amount you want to convert.
  2. Choose the unit to convert from and the unit to convert to.
  3. Read the result: the converted amount and the same amount in the other units. It appears once every required field has a valid value.

Worked examples

Conversions from electronvolts to joules:

  • 1 eV = 1.602176634 × 10⁻¹⁹ J
  • 5 eV = 8.01088317 × 10⁻¹⁹ J
  • 10 eV = 1.602176634 × 10⁻¹⁸ J
  • 50 eV = 8.01088317 × 10⁻¹⁸ J
  • 100 eV = 1.602176634 × 10⁻¹⁷ J

Multiply the number of electronvolts by 1.602176634 × 10⁻¹⁹ to get joules. Both units are exact definitions, so 1.602176634 × 10⁻¹⁹ is the exact factor: 1 eV = 1.602176634 × 10⁻¹⁹ J.

Sources: Electronvolt: SI Brochure, 9th edition (2019). Joule: SI Brochure, 9th edition (2019).

Limitations

  • Converts units of energy only. It does not work out energy from power, time, voltage or charge.

FAQs

Q: How many joules are in one electronvolt?
A: One electronvolt is exactly 1.602176634 × 10⁻¹⁹ joules. Change the value to convert any amount; the other units are listed below the result.
Q: Which definition of the units does this page use?
A: Calories here are thermochemical calories (1 cal = 4.184 J exactly), the definition commonly used in chemistry and nutrition. The International Table calorie (4.1868 J) is slightly larger. The electronvolt is defined from the elementary charge, so its value in joules is exact.
Q: Can I convert from joules to electronvolts?
A: Yes. Choose joule in the From box and electronvolt in the To box. One joule is about 6.2415091 × 10¹⁸ electronvolts.

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