Convert Inch-Pound-Force to Kilocalories
Convert Inch-Pound-Force (in·lbf) to Kilocalories (kcal) instantly and accurately.
Conversion Formula
kcal = in·lbf × 2.700402223e-5
About Inch-Pound-Force
An inch-pound-force (in·lbf) is the work done by one pound-force through one inch - exactly 0.11298482902761670 J (= 1/12 ft·lbf). It is the dominant torque unit for small fasteners and precision instruments in the US: a #6-32 screw in aluminium is torqued to 4-6 in·lbf; a dental implant abutment screw to ~25-30 Ncm (2.2-2.7 in·lbf). Hobby servo motor torque is quoted in oz·in (1 in·lbf = 16 oz·in). Bicycle stem bolts are typically 4-6 Nm (35-53 in·lbf). 1 in·lbf = 0.11298 J = 1/12 ft·lbf = 11.298 Ncm.
About Kilocalories
A kilocalorie (kcal) - the food Calorie (capital C) on US and Canadian nutrition labels - is exactly 4,184 J. WHO recommends ~2,000-2,500 kcal/day for adults. Energy density of nutrients: fat 9 kcal/g, carbohydrate 4 kcal/g, protein 4 kcal/g, ethanol 7 kcal/g. Running at 10 km/h burns ~600-800 kcal/h. Standard free energy of ATP hydrolysis is approximately −7.3 kcal/mol (−30.5 kJ/mol). Pre-SI thermodynamic tables in the US and Japan use kcal/mol for reaction enthalpies. 1 kcal = 4,184 J = 4.184 kJ = 3.968 BTU = 1.163 Wh.
Quick Reference Table
| Inch-Pound-Force (in·lbf) | Kilocalories (kcal) |
|---|---|
| 1 in·lbf | 2.7 × 10-5 kcal |
| 2 in·lbf | 5.401 × 10-5 kcal |
| 5 in·lbf | 0.00013502 kcal |
| 10 in·lbf | 0.00027004 kcal |
| 25 in·lbf | 0.000675101 kcal |
| 50 in·lbf | 0.0013502 kcal |
| 100 in·lbf | 0.0027004 kcal |