An electronvolt is the energy gained by an electron across one volt.
Electronvolts to BTU Converter — eV to BTU
Convert Electronvolt (eV) to BTU (BTU) using the exact conversion factor (1 electronvolt = 1.51857e-22 btu). See the formula, worked examples, conversion table, unit comparison, history, and common uses.
Electronvolts to BTU converter
Converter
Engineering Converter
Convert common stress, force, torque, power, and energy units used in engineering.
Context values
Some unit families need one extra value for a physically accurate result.
British thermal unit.
Result = input x 1.60217663e-19 / 1055.055853.
Energy units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Electronvolts to BTU
Electronvolt and BTU both measure a quantity used in structural or mechanical engineering — commonly stress, pressure, force, torque, power, or energy — where converting between the unit conventions used in different regions, industries, or equipment specifications is a routine part of design work. Electronvolt is typically associated with standard unit throughout particle physics, atomic physics, and chemistry worldwide, while BTU is typically associated with united States (HVAC, heating, and appliance energy ratings).
Formula
btu = electronvolts × 1.51857e-22
This factor comes from each unit's defined relationship to the category's base unit: 1 electronvolt equals 1.602177e-19 base units, and 1 btu equals 1055.05585262 base units, so dividing one by the other gives the direct electronvolt-to-btu factor of 1.51857e-22.
Simple example
1 eV × 1.51857e-22 = 1.51857e-22 BTU
1 electronvolt = 1.51857e-22 btu.
Real-world example
100 eV × 1.51857e-22 = 1.51857e-20 BTU
100 electronvolts = 1.51857e-20 btu.
Conversion table
| Electronvolt (eV) | BTU (BTU) |
|---|---|
| 1 eV | 1.51857e-22 BTU |
| 10 eV | 1.51857e-21 BTU |
| 50 eV | 7.592852e-21 BTU |
| 100 eV | 1.51857e-20 BTU |
| 500 eV | 7.592852e-20 BTU |
| 1,000 eV | 1.51857e-19 BTU |
Reverse conversion: BTU to Electronvolt
1.51857e-22 BTU × 6.585141e+21 = 0.999999708 eV
1.51857e-22 btu = 0.999999708 electronvolts.
electronvolts = btu × 6.585141e+21
For a page dedicated to this direction, see BTU to Electronvolt.
Electronvolt vs. BTU
| Aspect | Electronvolt | BTU |
|---|---|---|
| Family | non-SI unit accepted for use with the SI, common in physics | US customary unit |
| Typical use | Particle physics (particle accelerator energies are often quoted in GeV or TeV) | Air conditioner and furnace capacity ratings in the US |
| Where it's used | Standard unit throughout particle physics, atomic physics, and chemistry worldwide | United States (HVAC, heating, and appliance energy ratings) |
Understanding the Electronvolt
Electronvolt (eV) measures energy. The energy gained by a single electron accelerated through an electric potential difference of one volt — a very small amount of energy, exactly 1.602176634 × 10⁻¹⁹ joules. It is classified as a non-SI unit accepted for use with the SI, common in physics.
Where it's used: Standard unit throughout particle physics, atomic physics, and chemistry worldwide
Uses of the Electronvolt today
- Particle physics (particle accelerator energies are often quoted in GeV or TeV)
- Atomic and molecular energy levels
- Semiconductor band-gap energies
Understanding the BTU
BTU (BTU) measures energy. A British thermal unit is defined as exactly 1,055.05585262 joules (the International Table BTU). It is classified as a US customary unit.
Where it's used: United States (HVAC, heating, and appliance energy ratings)
Uses of the BTU today
- Air conditioner and furnace capacity ratings in the US
- Water heater and appliance energy specifications
- US energy industry (natural gas is often billed via BTU content)
History of the BTU
The BTU originated in 19th-century steam engineering as the heat needed to raise one pound of water by one degree Fahrenheit, paralleling the calorie's metric definition. Several slightly different BTU values existed historically before the 'International Table' BTU was standardized at exactly 1,055.05585262 joules.
Historical origin. BTU was not the invention of a single named person; it developed through the process described above.
Electronvolt — sources
- BIPM SI Brochure, 9th edition — Electronvolt listed as a non-SI unit accepted for use with the SI, with its exact value fixed via the elementary charge.
BTU — sources
- NIST Special Publication 811 — Documents the International Table BTU's exact joule equivalence.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many btu are in 1 electronvolt?
1 electronvolt equals 1.51857e-22 btu, using the exact defined conversion factor rather than an estimate.
How do I convert electronvolt to btu?
Multiply the electronvolt value by 1.51857e-22. The converter above does this instantly to whatever precision you set.
How do I convert btu back to electronvolt?
Use the reverse factor: 1 btu equals 6.585141e+21 electronvolts. You can also use the swap control in the converter above to flip the direction instantly.
What is a electronvolt?
Electronvolt (eV) measures energy. The energy gained by a single electron accelerated through an electric potential difference of one volt — a very small amount of energy, exactly 1.602176634 × 10⁻¹⁹ joules. It is classified as a non-SI unit accepted for use with the SI, common in physics.
What is a btu?
BTU (BTU) measures energy. A British thermal unit is defined as exactly 1,055.05585262 joules (the International Table BTU). It is classified as a US customary unit.
Is the electronvolt to btu conversion exact?
Yes. A British thermal unit is defined as exactly 1,055.05585262 joules (the International Table BTU). That fixed definition is what the converter above uses, so any rounding you see is a display choice, not a limitation of the math.
Where is the electronvolt still used today?
Standard unit throughout particle physics, atomic physics, and chemistry worldwide
Why do engineering unit conventions vary so much by region and industry?
Pressure, force, and stress can be expressed in metric (pascal, newton), US customary (psi, pound-force), or older and industry-specific units (atmosphere, torr, kip) depending on the country, industry, and even the equipment manufacturer, which is why engineers routinely need to convert between them when working across specs from different sources.