Convert BTU to Electronvolts
1 British thermal unit (BTU) equals 6.585140678 × 10²¹ electronvolts (eV).
1 BTU = 6.585140678e21 eV
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk BTU to electronvolt converter to paste a column from Excel.
How to Convert BTU to Electronvolt
- 1 BTU = 6.585140678 × 10²¹ eV
- 1 eV = 1.518570443 × 10⁻²² BTU
- Example: convert 15 BTU to eV: 15 BTU = 15 × 6.585140678 × 10²¹ eV = 9.877711017 × 10²² eV
Reference conditions. BTU: International Table BTU (BTU_IT), 1055.05585262 J exactly.
Formula
eV = BTU × 6.585140678191 × 10²¹
Derivation from SI units:
- 1 BTU_IT = 1055.05585262 J (exact)
- 1 eV = e × 1 V = 1.602176634 × 10⁻¹⁹ J (exact since 2019)
- 1 BTU = 1055.05585262 J ÷ 1.602176634 × 10⁻¹⁹ J per eV = 6.585140678191 × 10²¹ eV
Both units are defined exactly, so the factor is exact. BTU definition: British thermal unit; Electronvolt definition: electronvolt.
Worked examples
- A reading of 3412 BTU converts to 2.246849999 × 10²⁵ eV.
3412 BTU × 6.585140678 × 10²¹ = 2.246849999 × 10²⁵ eV - A value of 24000 BTU is 1.580433763 × 10²⁶ eV.
24000 BTU × 6.585140678 × 10²¹ = 1.580433763 × 10²⁶ eV
BTU to Electronvolt conversion table
| BTU | Electronvolts (eV) |
|---|---|
| 1 BTU | 6.585140678 × 10²¹ eV |
| 100 BTU | 6.585140678 × 10²³ eV |
| 1000 BTU | 6.585140678 × 10²⁴ eV |
| 3412 BTU | 2.246849999 × 10²⁵ eV |
| 5000 BTU | 3.292570339 × 10²⁵ eV |
| 10000 BTU | 6.585140678 × 10²⁵ eV |
| 12000 BTU | 7.902168814 × 10²⁵ eV |
| 24000 BTU | 1.580433763 × 10²⁶ eV |
| 50000 BTU | 3.292570339 × 10²⁶ eV |
| 100000 BTU | 6.585140678 × 10²⁶ eV |
| 1000000 BTU | 6.585140678 × 10²⁷ eV |
Where it's used
BTU are used for furnace, boiler and fuel ratings in the US, while electronvolts appear in atomic and particle physics. Both measure energy, work and heat, so the conversion is a fixed factor.
BTU to other energy units
| Conversion | 1 BTU equals |
|---|---|
| BTU to joule | 1055.055853 J |
| BTU to kilojoule | 1.055055853 kJ |
| BTU to megajoule | 0.001055055853 MJ |
| BTU to calorie | 252.1644007 cal |
| BTU to kilocalorie | 0.2521644007 kcal |
| BTU to watt-hour | 0.2930710702 Wh |
| BTU to kilowatt-hour | 0.0002930710702 kWh |
| BTU to therm | 0.00001000238767 thm |
| BTU to electronvolt | 6.585140678 × 10²¹ eV |
| BTU to foot-pound | 778.1692623 ft·lbf |
| BTU to erg | 10550558530 erg |
Frequently asked questions
How many electronvolts are in 1 British thermal unit?
1 BTU = 6.585140678 × 10²¹ eV.
How do I convert British thermal units to electronvolts?
Multiply the value in BTU by 6.585140678 × 10²¹. For example, 15 BTU × 6.585140678 × 10²¹ = 9.877711017 × 10²² eV.
Is the BTU to eV conversion exact?
Yes. Both units are defined exactly, so the ratio is exact; its decimal form does not terminate and is shown here to 10 significant figures (more with the precision selector).
Sources
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "British thermal unit_IT (Btu_IT)".
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 8 and the fixed elementary charge e.
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Convert BTU to Electronvolts. Retrieved October 17, 2026, from https://scientificconverters.com/energy/btu-to-electronvolts/
IEEE
Scientific Converters, "Convert BTU to Electronvolts," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/energy/btu-to-electronvolts/