Convert energy units — joules, kilowatt-hours, calories, BTU, electron volts and more.
| Unit | Name | Value |
|---|---|---|
| 0.001 ft·lb | 8.463e+15 eV | |
| 0.01 ft·lb | 8.463e+16 eV | |
| 0.1 ft·lb | 8.463e+17 eV | |
| 1 ft·lb | 8.463e+18 eV | |
| 5 ft·lb | 4.232e+19 eV | |
| 10 ft·lb | 8.463e+19 eV | |
| 50 ft·lb | 4.232e+20 eV | |
| 100 ft·lb | 8.463e+20 eV | |
| 1000 ft·lb | 8.463e+21 eV |
Formula: Electron Volt = Foot-Pound × 8.4633e18
Multiply any foot-pound value by 8.4633e18 to get electron volt.
Reverse: Foot-Pound = Electron Volt × 1.1816e-19
Common foot-pound values — factor: 1 ft·lb = 8.4633e18 eV
| Foot-Pound (ft·lb) | Electron Volt (eV) | Context |
|---|---|---|
| 1 ft·lb | 8.463e+18 eV | 1 ft·lb |
| 10 ft·lb | 8.463e+19 eV | 10 ft·lb |
| 100 ft·lb | 8.463e+20 eV | 100 ft·lb |
| 350 ft·lb | 2.962e+21 eV | 9mm pistol |
| 550 ft·lb | 4.655e+21 eV | 1 HP/s |
| 1,000 ft·lb | 8.463e+21 eV | Rifle bullet |
| 3,000 ft·lb | 2.539e+22 eV | High-power rifle |
| 1e+04 ft·lb | 8.463e+22 eV | 10 kft·lb |
| 1e+05 ft·lb | 8.463e+23 eV | 100 kft·lb |
| 1e+06 ft·lb | 8.463e+24 eV | 1 Mft·lb |
| 1e+07 ft·lb | 8.463e+25 eV | 10 Mft·lb |
| 1.000e+09 ft·lb | 8.463e+27 eV | 1 Gft·lb |
| 1.000e+12 ft·lb | 8.463e+30 eV | 1 Tft·lb |
| 1.000e+15 ft·lb | 8.463e+33 eV | 1 Pft·lb |
| 1.000e+18 ft·lb | 8.463e+36 eV | 1 Eft·lb |
1 ft·lb = 8.4633e18 eV. Memorize for instant estimates.
Use 8.4633e18 as a quick mental multiplier.
Multiply result by 1.1816e-19 to recover the original ft·lb value.
Torques bolts and fasteners to specified ft·lb values using a torque wrench.
Rates firearm muzzle energy in ft·lb for US ammunition comparisons.
Calculates impact energy absorption in ft·lb for US building codes.
Measures and compares engine torque output in ft·lb on a dyno.
Specifies fall arrest and impact energy in ft·lb for OSHA compliance.
Evaluates hunting cartridge terminal energy in ft·lb for ethical dispatch.
The foot-pound (ft·lb) is an Imperial unit of energy equal to the work done when a force of one pound-force moves an object one foot, equaling 1.35582 joules. It has been used in British and American engineering since the 18th century.
Foot-pounds are standard in US mechanical engineering for torque specifications, engine output (often ft·lb of torque), and ballistic energy measurements. Rifle bullet energies are commonly quoted in foot-pounds in American publications.
Interesting fact: A typical 9mm pistol bullet has about 350 ft·lb of muzzle energy. The torque specification for tightening a car wheel bolt is typically 80–100 ft·lb. One horsepower equals 550 ft·lb per second.
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 foot-pound 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 ft·lb = 4.2316e19 eV and 10 ft·lb = 8.4633e19 eV. Reverse: 1 eV = 1.1816e-19 ft·lb. Exact factor: 1 ft·lb = 8.4633e18 eV.
All conversions use IEEE 754 double-precision arithmetic, accurate to at least 8 significant figures.