Aisha K.
Mar 12, 2026
Clean layout and the results update instantly. Exactly what I needed for a quick planning check.
Unit Converters
Electronvolts to Joules Converter (eV to J)
Electronvolts
eV → J
1.6022e-19 J
1 eV → 1.602×10⁻¹⁹ J. 1 MeV → 1.602×10⁻¹³ J. 13.6 eV → 2.18×10⁻¹⁸ J.
- You typed
- 1 eV
- One J is
- 6.2415e18 eV
- How it’s calculated
- joules = eV × 1.602176634 × 10⁻¹⁹ (exact, SI).
Electronvolts to Joules conversion table
Common eV values in J. Same factor as the converter above: joules = eV × 1.602176634 × 10⁻¹⁹ (exact, SI).
| Electronvolts | Joules |
|---|---|
| 0.25 eV | 4.0054e-20 J |
| 0.5 eV | 8.0109e-20 J |
| 1 eV | 1.6022e-19 J |
| 2 eV | 3.2044e-19 J |
| 5 eV | 8.0109e-19 J |
| 10 eV | 1.6022e-18 J |
| 13.6 eV | 2.1790e-18 J |
| 20 eV | 3.2044e-18 J |
| 25 eV | 4.0054e-18 J |
| 50 eV | 8.0109e-18 J |
| 100 eV | 1.6022e-17 J |
| 1,000,000 eV | 1.6022e-13 J |
Plain-English guide
Terms & how it works
Confused by a field? Read the short definitions here while you use the tool.
Electronvolts
The “Electronvolts” value used in this tool’s formula. Adjust it to see results update live.
joules = eV × 1.602176634 × 10⁻¹⁹ (exact, SI).
An electronvolt is tiny: 1.602176634 × 10⁻¹⁹ J, defined from the elementary charge. Hydrogen’s 13.6 eV ionization is 2.18 × 10⁻¹⁸ J. Particle physics uses MeV and GeV; multiply by a million or a billion first.
How this calculator works
An electronvolt is tiny: 1.602176634 × 10⁻¹⁹ J, defined from the elementary charge. Hydrogen’s 13.6 eV ionization is 2.18 × 10⁻¹⁸ J. Particle physics uses MeV and GeV; multiply by a million or a billion first. joules = eV × 1.602176634 × 10⁻¹⁹ (exact, SI). Scenario: 1 eV → 1.602×10⁻¹⁹ J. 1 MeV → 1.602×10⁻¹³ J. 13.6 eV → 2.18×10⁻¹⁸ J.
joules = eV × 1.602176634 × 10⁻¹⁹ (exact, SI).
Scenario: 1 eV → 1.602×10⁻¹⁹ J. 1 MeV → 1.602×10⁻¹³ J. 13.6 eV → 2.18×10⁻¹⁸ J.
When to use this Electronvolts to Joules
Common use cases
- An electronvolt is tiny: 1.602176634 × 10⁻¹⁹ J, defined from the elementary charge. Hydrogen’s 13.6 eV ionization is 2.18 × 10⁻¹⁸ J. Particle physics uses MeV and GeV; multiply by a million or a billion first.
- Sanity-check with this scenario: 1 eV → 1.602×10⁻¹⁹ J. 1 MeV → 1.602×10⁻¹³ J. 13.6 eV → 2.18×10⁻¹⁸ J.
- The relationship is: joules = eV × 1.602176634 × 10⁻¹⁹ (exact, SI).
Localized examples
- Unit Converters: the example on this page uses the same formula as the widget.
What you get
- Fields: Electronvolts
- joules = eV × 1.602176634 × 10⁻¹⁹ (exact, SI).
- Scenario on the page: 1 eV → 1.602×10⁻¹⁹ J. 1 MeV → 1.602×10⁻¹³ J. 13.6 eV → 2.18×10⁻¹⁸ J.
How to Convert Electronvolts to Joules
- 1Enter Electronvolts. Use the values you have, not a catalog average, unless that is all you know.
- 2joules = eV × 1.602176634 × 10⁻¹⁹ (exact, SI).
- 3Scenario: 1 eV → 1.602×10⁻¹⁹ J. 1 MeV → 1.602×10⁻¹³ J. 13.6 eV → 2.18×10⁻¹⁸ J.
- 4Check which dictionary the other person is using — US or UK, decimal or 1,024 — then trust the number.
Governing formula
joules = eV × 1.602176634 × 10⁻¹⁹ (exact, SI).
1 eV → 1.602×10⁻¹⁹ J. 1 MeV → 1.602×10⁻¹³ J. 13.6 eV → 2.18×10⁻¹⁸ J.
1 eV → 1.602×10⁻¹⁹ J. 1 MeV → 1.602×10⁻¹³ J. 13.6 eV → 2.18×10⁻¹⁸ J.
Variable definitions
- value
Electronvolts
The “Electronvolts” field. Default 1; typical range 0–100000000000000000000.
- The conversion (joules = eV × 1.602176634 × 10⁻¹⁹ (exact, SI).) does not pick US vs UK gallons, SI vs binary megabytes, or Mach at altitude for you. Read the footnote on the page.
- Nothing here is uploaded for the calculation itself.
Frequently Asked Questions
511 keV. Convert keV → eV × 1,000, then to joules.
Related calculators
Unit Converters
- Calories to JoulesA small calorie (cal) is 4.184 J — heat to warm 1 g of water 1 °C. Food “Calories” on a US label are kilocalories (kcal): 1 kcal = 4,184 J. If you paste 2,000 from a snack wrapper without noticing the capital C, you are off by a thousand.
- Celsius Heat Units to JoulesA Celsius heat unit is the heat to raise 1 pound of water by 1 °C — about 1,899 J. Old HVAC and process papers use CHU. If you expected BTU, you are on the Fahrenheit twin (1 lb × 1 °F). Do not mix them in a load calc.
- IT Calories to JoulesThe International Table calorie is 4.1868 J. The thermochemical calorie on the other calories-to-joules page is 4.184 J. Steam tables and some older engineering texts use IT. Food “Calories” (kcal) are almost always thermochemical × 1,000, not IT.
- Kilojoules to JoulesMultiply kJ by 1,000. Nutrition labels in kJ, physics problems in J. A 4.184 kJ snack line is 4,184 J, which is 1 thermochemical kcal. The SI joule prefix tool also does mega and giga if the label jumps.
- kWh to MegajoulesYour electric bill is in kWh. Physics problems want joules. 1 kWh = 3.6 MJ exactly (1,000 W × 3,600 s). A 30 kWh EV pack is 108 MJ. That is energy stored, not how far you will get in the rain.
- SI Joule Prefix ConverterFood calories (thermochemical) are 4.184 J. Nutrition labels in kJ. Explosives data in MJ and GJ. Same joule. kWh and BTU are other dictionaries with their own pages.
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4.8
out of 5.0
4 reviews
Daniel R.
Feb 28, 2026
Very usable on mobile. Would love a save/export option later, but the math feels solid.
Priya S.
Feb 3, 2026
The FAQ section answered my questions before I even had to search. Smooth dark mode too.
Marcus L.
Jan 19, 2026
Simple inputs, clear outputs. This replaced three bookmarks I used to juggle.
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