Horsepower (mechanical) to Kilocalorie per Hour (thermochemical) Converter
Power · unit-converter
Convert Horsepower (mechanical) to Kilocalorie per Hour (thermochemical) with a fixed input and output unit, step-by-step formula line, and reference tables. Linear units use SI watt definitions; mechanical hp uses 550 ft·lbf/s; BTU/h uses the IT BTU; dBm/dBW are logarithmic relative to 1 mW and 1 W. The full Power Converter also includes PS/CV, TR, kVA/MVA, and ft·lb/s.
Calculator
From: Horsepower (mechanical) (hp)
To: Kilocalorie per Hour (thermochemical) (kcal_h)
About Horsepower (mechanical)
Mechanical horsepower here is the US definition: 550 ft·lbf/s ≈ 745.70 W. Automotive and industrial specs often cite hp.
About Kilocalorie per Hour (thermochemical)
Kilocalories per hour is a thermal power rate using the thermochemical kilocalorie (4,184 J per kcal) spread over one hour.
How to convert horsepower (mechanical, 550 ft·lb/s) to kilocalories per hour (thermochemical)
1 horsepower (mechanical) is equal to 641.61556828302412 kilocalorie per hour (thermochemical) when both are expressed in watt-equivalents:
1 hp = (745.6998715822702 W ÷ 1.1622222222222223 W) kcal_h = 641.61556828302412 kcal_h
Each horsepower (mechanical) is defined as 745.6998715822702 W and each kilocalorie per hour (thermochemical) as 1.1622222222222223 W in this tool, so one hp equals 745.6998715822702 ÷ 1.1622222222222223 kcal_h = 641.61556828302412 kcal_h.
Let d(hp) be the numeric value in Horsepower (mechanical) (hp), and d(kcal_h) the value in Kilocalorie per Hour (thermochemical) (kcal_h). Then:
d(kcal_h) = d(hp) × (745.6998715822702 / 1.1622222222222223)
Equivalently, divide by how many hp fit into one kcal_h (watts per kcal_h divided by watts per hp):
d(kcal_h) = d(hp) ÷ 0.00155856567302
Or: kilocalorie per hour (thermochemical) = horsepower (mechanical) ÷ 0.00155856567302
Examples
Example #1: Convert 1 hp to kilocalorie per hour (thermochemical)
1 hp = 1 hp × (745.6998715822702/1.1622222222222223) kcal_h = 641.615568283 kcal_h
1 hp = 1 hp ÷ 0.00155856567302 = 641.615568283 kcal_h
Intermediate watts: 745.699871582 W
Example #2: Convert 10 hp to kilocalorie per hour (thermochemical)
10 hp = 10 hp × (745.6998715822702/1.1622222222222223) kcal_h = 6416.15568283 kcal_h
10 hp = 10 hp ÷ 0.00155856567302 = 6416.15568283 kcal_h
Intermediate watts: 7,456.99871582 W
Summary
To convert Horsepower (mechanical) to Kilocalorie per Hour (thermochemical), multiply the value in hp by the ratio of watts per hp divided by watts per kcal_h. Equivalently: value_kcal_h = value_hp × (745.6998715822702 / 1.1622222222222223). Numerically, 1 hp equals 641.6155682830241 kcal_h.
Relationship context
You are converting between mechanical power (horsepower, ft·lb/s) (Horsepower (mechanical, 550 ft·lb/s)) and thermal engineering rates (BTU/h, kcal/h) (Kilocalories per Hour (thermochemical)). All linear values are mapped through watts first. The numeric factor is 6.416156e+2.
Conversion tables
| Horsepower (mechanical) (hp) | Kilocalorie per Hour (thermochemical) (kcal_h) |
|---|---|
| 0.1 | 64.1615568283 |
| 1 | 641.615568283 |
| 2 | 1,283.23113657 |
| 3 | 1,924.84670485 |
| 4 | 2,566.46227313 |
| 5 | 3,208.07784142 |
| 6 | 3,849.6934097 |
| 7 | 4,491.30897798 |
| 8 | 5,132.92454626 |
| 9 | 5,774.54011455 |
| Horsepower (mechanical) (hp) | Kilocalorie per Hour (thermochemical) (kcal_h) |
|---|---|
| 10 | 6,416.15568283 |
| 20 | 12,832.3113657 |
| 30 | 19,248.4670485 |
| 40 | 25,664.6227313 |
| 50 | 32,080.7784142 |
| 60 | 38,496.934097 |
| 70 | 44,913.0897798 |
| 80 | 51,329.2454626 |
| 90 | 57,745.4011455 |
| 100 | 64,161.5568283 |