21 Calorie/Hour to Horsepower (Mech)
Quick answer
21 Calorie/Hour (cal/h) equals
3.272988e-5 hp
To convert 21 Calorie/Hours to Horsepower (Mech)s, multiply by 1.558566e-6. Therefore, 21 Calorie/Hour (cal/h) equals 3.272988e-5 Horsepower (Mech) (hp).
Formula: hp = cal/h × 1.558566e-6. Calculation: 21 × 1.558566e-6 = 3.272988e-5 hp.
Convert Calorie/Hour (cal/h) to Horsepower (Mech) (hp) online with our free unit converter. In power, 1 cal/h = 1.558566e-6 hp. Explore step-by-step conversion steps, mathematical formulas, and quick conversion reference tables below.
Worked example: converting Calorie/Hour to Horsepower (Mech)
- Step 1 — start with the formula. hp = cal/h × 0.0000015586
- Step 2 — substitute your figure. 21 cal/h × 1.558566e-6
- Step 3 — read the result. 21 cal/h = 3.272988e-5 hp
- Step 4 — check it in reverse. cal/h = hp × 641,615.5684057038 returns 21 cal/h, which matches the figure you started with.
Power Converter
22 units available
21 cal/h = 3.272988e-5 hp
Formula:
hp = cal/h × 0.0000015586With your value: 21 cal/h = 3.272988e-5 hp
How big is that?
Everyday references on a logarithmic scale, all expressed in calorie/hour so you can sanity-check the result.
Other Calorie/Hour to Horsepower (Mech) conversions
Calorie/Hour to Horsepower (Mech) Conversion Table
| Calorie/Hour (cal/h) | Horsepower (Mech) (hp) |
|---|---|
| 0.5 | 7.792828e-7 |
| 1 | 1.558566e-6 |
| 2 | 3.117131e-6 |
| 5 | 7.792828e-6 |
| 10 | 1.558566e-5 |
| 15 | 2.337849e-5 |
| 20 | 3.117131e-5 |
| 25 | 3.896414e-5 |
| 50 | 7.792828e-5 |
| 100 | 0.000156 |
| 250 | 0.00039 |
| 500 | 0.000779 |
| 1000 | 0.001559 |
Horsepower (Mech) to Calorie/Hour Conversion Table
| Horsepower (Mech) (hp) | Calorie/Hour (cal/h) |
|---|---|
| 0.5 | 320,807.784203 |
| 1 | 641,615.568406 |
| 2 | 1,283,231.136811 |
| 5 | 3,208,077.842029 |
| 10 | 6,416,155.684057 |
| 15 | 9,624,233.526086 |
| 20 | 12,832,311.368114 |
| 25 | 16,040,389.210143 |
| 50 | 32,080,778.420285 |
| 100 | 64,161,556.84057 |
| 250 | 160,403,892.101426 |
| 500 | 320,807,784.202852 |
| 1000 | 641,615,568.405704 |
Where these values come from
Every factor on this page is traced to the document that defines it. See the full provenance dataset or our methodology.
Calorie/Hour (cal/h)
Power
Derived from the watt (1 W = 1 J/s).
Source: NIST Special Publication 811, Guide for the Use of the International System of Units
National Institute of Standards and Technology (US) · Reviewed 2026-07-01
Horsepower (Mech) (hp)
Power
Mechanical horsepower is exactly 550 ft·lbf/s = 745.699 871 582 270 22 W.
Metric horsepower (PS) is 735.498 75 W — about 1.4 % lower.
Source: NIST Special Publication 811, Guide for the Use of the International System of Units
National Institute of Standards and Technology (US) · Reviewed 2026-07-01
How to Convert Calorie/Hour to Horsepower (Mech)
To convert from Calorie/Hour (cal/h) to Horsepower (Mech) (hp), multiply the value by 1.558566e-6.
Formula: hp = cal/h × 0.0000015586
Reverse: cal/h = hp × 641,615.5684057038
Step-by-Step Example
- Start with your value in Calorie/Hour. For example: 5 cal/h
- Multiply by the conversion factor: 5 x 1.558566e-6
- The result is: 7.792828e-6 hp
Calorie/Hour and Horsepower (Mech) Relationship
This calculation facilitates standardized conversion between recognized units of power. Since 1 Calorie/Hour represents a fraction of a Horsepower (Mech) (1 Horsepower (Mech) ≈ 6.416e+5 Calorie/Hours), the Horsepower (Mech) is the larger measurement interval. Understanding the relationship between Calorie/Hour and Horsepower (Mech) is essential for accurate calculations in physics, engineering, commerce, and daily applications.
About Calorie/Hour
The Calorie/Hour (symbol: cal/h) is a recognized unit in the Standard measurement framework, utilized within power applications for precision and standardized data representation.
Common uses of Calorie/Hour: power calculations, engineering and science, education.
About Horsepower (Mech)
The Horsepower (Mech) (symbol: hp) is a recognized unit in the Standard measurement framework, utilized within power applications for precision and standardized data representation.
Common uses of Horsepower (Mech): power calculations, engineering and science, education.
Frequently Asked Questions
- What is 21 Calorie/Hour in Horsepower (Mech)?
- 21 Calorie/Hour equals 3.272988e-5 Horsepower (Mech).
- How many Horsepower (Mech)s are in 1 Calorie/Hour?
- There are exactly 1.558566e-6 Horsepower (Mech)s in 1 Calorie/Hour. This means the conversion factor from Calorie/Hour to Horsepower (Mech) is 1.558566e-6.
- What is the formula to convert Calorie/Hour to Horsepower (Mech)?
- The formula to convert Calorie/Hour to Horsepower (Mech) is: hp = cal/h × 0.0000015586. For example, to convert 10 Calorie/Hours to Horsepower (Mech)s, you would multiply 10 by 1.558566e-6.
- What is a Calorie/Hour?
- The Calorie/Hour (symbol: cal/h) is a recognized unit in the Standard measurement framework, utilized within power applications for precision and standardized data representation.
- What is a Horsepower (Mech)?
- The Horsepower (Mech) (symbol: hp) is a recognized unit in the Standard measurement framework, utilized within power applications for precision and standardized data representation.
- What are the common uses of Calorie/Hour?
- The Calorie/Hour is commonly used in power calculations, engineering and science, education.
Related Power Conversions
Cite this page
UnitConvertLab. (2026). 21 Calorie/Hour to Horsepower (Mech). UnitConvertLab. Retrieved from https://unitconvertlab.com/convert/21-calorie_per_hour-to-horsepower_mech