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Electronvolts to British Thermal Units Converter

Convert electronvolts (eV) to British thermal units (IT) (Btu), with the formula, a conversion table and exact factors.

Change the values and press Calculate to work out your own figures.

Enter an amount of energy, choose its unit and the unit you want. The answer is exact until it is shown, and the same value appears in every other unit.

A number, fraction (3/8), mixed number (1 1/2), scientific notation (2.5e6) or a simple sum such as 2*3.
The unit you want the answer in. Swap exchanges the two units.
Result
1.51857044347 × 10⁻²² Btu
joules (watt-seconds)
1.602176634 × 10⁻¹⁹ J
kilojoules
1.602176634 × 10⁻²² kJ
megajoules
1.602176634 × 10⁻²⁵ MJ
gigajoules
1.602176634 × 10⁻²⁸ GJ
calories (thermochemical)
3.82929405832 × 10⁻²⁰ cal
kilocalories (food Calories)
3.82929405832 × 10⁻²³ kcal
megacalories
3.82929405832 × 10⁻²⁶ Mcal
watt-hours
4.45049065 × 10⁻²³ Wh
kilowatt-hours
4.45049065 × 10⁻²⁶ kWh
megawatt-hours
4.45049065 × 10⁻²⁹ MWh
million Btu
1.51857044347 × 10⁻²⁸ MMBtu
therms (100,000 Btu)
1.51857044347 × 10⁻²⁷ thm
quads (10¹⁵ Btu)
1.51857044347 × 10⁻³⁷ quad
kiloelectronvolts
0.001 keV
megaelectronvolts
1 × 10⁻⁶ MeV

1 eV = 1.51857044347 × 10⁻²² Btu

Show the working
  1. 1 eV = 1.51857044347e-22 Btu
  2. 1 × 1.51857044347e-22 = 1.51857044347e-22 Btu

How to convert electronvolts to british thermal units

1 eV = 1.51857044347 × 10⁻²² Btu, so multiply by 1.51857044347 to go from electronvolts to British thermal units (IT). Going the other way, 1 Btu = 6.58514067819 × 10²¹ eV.

Btu = eV × 1.51857044347
eV = Btu × 6.58514067819

Worked example:

1 eV = 1.51857044347e-22 Btu
5 × 1.51857044347e-22 = 7.59285221736e-22 Btu

Electronvolts to british thermal units table

ElectronvoltsBritish Thermal Units
1 eV1.51857044347 × 10⁻²² Btu
2 eV3.03714088694 × 10⁻²² Btu
3 eV4.55571133041 × 10⁻²² Btu
4 eV6.07428177388 × 10⁻²² Btu
5 eV7.59285221736 × 10⁻²² Btu
6 eV9.11142266083 × 10⁻²² Btu
7 eV1.06299931043 × 10⁻²¹ Btu
8 eV1.21485635478 × 10⁻²¹ Btu
9 eV1.36671339912 × 10⁻²¹ Btu
10 eV1.51857044347 × 10⁻²¹ Btu
15 eV2.27785566521 × 10⁻²¹ Btu
20 eV3.03714088694 × 10⁻²¹ Btu
25 eV3.79642610868 × 10⁻²¹ Btu
30 eV4.55571133041 × 10⁻²¹ Btu
40 eV6.07428177388 × 10⁻²¹ Btu
50 eV7.59285221736 × 10⁻²¹ Btu
75 eV1.1389278326 × 10⁻²⁰ Btu
100 eV1.51857044347 × 10⁻²⁰ Btu
250 eV3.79642610868 × 10⁻²⁰ Btu
500 eV7.59285221736 × 10⁻²⁰ Btu
1000 eV1.51857044347 × 10⁻¹⁹ Btu

About the units

Electronvolts (eV)
Electronvolts, a specialised unit. Definition: NIST CODATA: elementary charge (exact since the 2019 SI redefinition).
British Thermal Units (Btu)
British thermal units (IT), a US customary unit. Definition: NIST SP 811 Appendix B.8, factors for units listed alphabetically.

Formula version 0.1.0Reviewed