Convert energy units — joules, kilowatt-hours, calories, BTU, electron volts and more.
| Unit | Name | Value |
|---|---|---|
| 0.001 BTU | 6.586e+18 eV | |
| 0.01 BTU | 6.586e+19 eV | |
| 0.1 BTU | 6.586e+20 eV | |
| 1 BTU | 6.586e+21 eV | |
| 5 BTU | 3.293e+22 eV | |
| 10 BTU | 6.586e+22 eV | |
| 50 BTU | 3.293e+23 eV | |
| 100 BTU | 6.586e+23 eV | |
| 1000 BTU | 6.586e+24 eV |
Formula: Electron Volt = BTU × 6.5859e21
Multiply any btu value by 6.5859e21 to get electron volt.
Reverse: BTU = Electron Volt × 1.5184e-22
Common btu values — factor: 1 BTU = 6.5859e21 eV
| BTU (BTU) | Electron Volt (eV) | Context |
|---|---|---|
| 1 BTU | 6.586e+21 eV | Match |
| 10 BTU | 6.586e+22 eV | 10 BTU |
| 100 BTU | 6.586e+23 eV | Space heater second |
| 1,000 BTU | 6.586e+24 eV | 1 kBTU |
| 3,412 BTU | 2.247e+25 eV | 1 kWh |
| 1e+04 BTU | 6.586e+25 eV | 10 kBTU |
| 1e+05 BTU | 6.586e+26 eV | 1 therm |
| 1e+06 BTU | 6.586e+27 eV | 1 MMBTU |
| 1e+07 BTU | 6.586e+28 eV | 10 MMBTU |
| 1e+08 BTU | 6.586e+29 eV | 100 MMBTU |
| 1.000e+09 BTU | 6.586e+30 eV | 1 billion BTU |
| 1.000e+10 BTU | 6.586e+31 eV | 10 billion BTU |
| 1.000e+12 BTU | 6.586e+33 eV | 1 quad fraction |
| 1.000e+15 BTU | 6.586e+36 eV | 1 quad |
| 1.000e+18 BTU | 6.586e+39 eV | 1000 quads |
1 BTU = 6.5859e21 eV. Memorize for instant estimates.
Use 6.5859e21 as a quick mental multiplier.
Multiply result by 1.5184e-22 to recover the original BTU value.
Sizes heating and cooling systems rated in BTU/hour for US buildings.
Certifies boiler output and efficiency ratings in BTU/hour.
Prices natural gas supply and usage in BTU and therms.
Calculates heating loads and heat loss in BTU for US properties.
Rates commercial refrigeration and ice-making capacity in BTU.
Specifies heat exchanger capacity and furnace output in BTU/hour.
The British Thermal Unit (BTU) is the traditional Imperial energy unit, defined as the heat required to raise 1 pound of water by 1°F. It equals 1,055.06 joules and has been used since the 19th century in heating, air conditioning, and gas billing.
BTU remains dominant in US HVAC: air conditioners and heaters are rated in BTU/hour. Natural gas is priced in therms (100,000 BTU) in the US. Furnaces are rated in BTU/hour output.
Interesting fact: A typical US home furnace is rated at 80,000–120,000 BTU/hour. One BTU is roughly the energy released by burning one kitchen match. The US natural gas pipeline system delivers about 25 quadrillion BTU (quads) per year.
The electron volt (eV) is the energy gained by a single electron accelerating through a potential difference of one volt, equal to approximately 1.602 × 10⁻¹⁹ joules. It was formally adopted as a unit by the IEC in 1930.
Electron volts are the standard energy unit in atomic physics, particle physics, and semiconductor engineering. Chemical bond energies are a few eV; X-ray photons are kiloelectron volts (keV); particle accelerators measure GeV and TeV.
Interesting fact: The Large Hadron Collider accelerates protons to 6.8 TeV (6.8 × 10¹² eV). Visible light photons have energies of 1.8–3.1 eV. The rest mass energy of an electron is 511 keV.
Converting btu to electron volt is common across energy, nutrition, engineering, and science. Different sectors use different energy units — joules in physics, kcal in nutrition, kWh in electricity, and BTU in HVAC — making accurate conversion essential for cross-disciplinary work and international comparisons.
Quick reference: 5 BTU = 3.2929e22 eV and 10 BTU = 6.5859e22 eV. Reverse: 1 eV = 1.5184e-22 BTU. Exact factor: 1 BTU = 6.5859e21 eV.
All conversions use IEEE 754 double-precision arithmetic, accurate to at least 8 significant figures.