Convert energy units — joules, kilowatt-hours, calories, BTU, electron volts and more.
| Unit | Name | Value |
|---|---|---|
| 0.001 ft·lb | 3.24049e-07 kcal | |
| 0.01 ft·lb | 3.24049e-06 kcal | |
| 0.1 ft·lb | 3.24049e-05 kcal | |
| 1 ft·lb | 0.000324049 kcal | |
| 5 ft·lb | 0.00162024 kcal | |
| 10 ft·lb | 0.00324049 kcal | |
| 50 ft·lb | 0.0162024 kcal | |
| 100 ft·lb | 0.0324049 kcal | |
| 1000 ft·lb | 0.324049 kcal |
Formula: Kilocalorie = Foot-Pound × 0.000324
Multiply any foot-pound value by 0.000324 to get kilocalorie.
Reverse: Foot-Pound = Kilocalorie × 3086
Common foot-pound values — factor: 1 ft·lb = 0.000324 kcal
| Foot-Pound (ft·lb) | Kilocalorie (kcal) | Context |
|---|---|---|
| 1 ft·lb | 0.000324 kcal | 1 ft·lb |
| 10 ft·lb | 0.00324 kcal | 10 ft·lb |
| 100 ft·lb | 0.0324 kcal | 100 ft·lb |
| 350 ft·lb | 0.1134 kcal | 9mm pistol |
| 550 ft·lb | 0.1782 kcal | 1 HP/s |
| 1,000 ft·lb | 0.324 kcal | Rifle bullet |
| 3,000 ft·lb | 0.9721 kcal | High-power rifle |
| 1e+04 ft·lb | 3.24 kcal | 10 kft·lb |
| 1e+05 ft·lb | 32.4 kcal | 100 kft·lb |
| 1e+06 ft·lb | 324 kcal | 1 Mft·lb |
| 1e+07 ft·lb | 3,240 kcal | 10 Mft·lb |
| 1.000e+09 ft·lb | 3.24e+05 kcal | 1 Gft·lb |
| 1.000e+12 ft·lb | 3.24e+08 kcal | 1 Tft·lb |
| 1.000e+15 ft·lb | 3.240e+11 kcal | 1 Pft·lb |
| 1.000e+18 ft·lb | 3.240e+14 kcal | 1 Eft·lb |
1 ft·lb = 0.000324 kcal. Memorize for instant estimates.
Use 0.000324 as a quick mental multiplier.
Multiply result by 3086 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 kilocalorie (kcal) equals 1,000 calories or 4,184 joules, and is the unit used on food labels worldwide (often written as 'Cal' with a capital C in the US). It was standardized by the International Table calorie in 1956.
Nutritionists, dietitians, and food scientists use kcal for daily energy intake recommendations. Most adults need 2,000–2,500 kcal/day. Exercise apps, fitness trackers, and dietary plans all operate on kcal.
Interesting fact: One gram of fat yields about 9 kcal, one gram of carbohydrate or protein yields about 4 kcal. A single sugar cube (4g) contains about 16 kcal.
Converting foot-pound to kilocalorie 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 = 0.00162 kcal and 10 ft·lb = 0.00324 kcal. Reverse: 1 kcal = 3086 ft·lb. Exact factor: 1 ft·lb = 0.000324 kcal.
All conversions use IEEE 754 double-precision arithmetic, accurate to at least 8 significant figures.