Horsepower-Hour to Calorie (th) Converter

Energy Converter

27 units available

Decimals:

From

To

641,615.568284

1 hp·h = 641,615.568284 cal

Formula:

cal = hp·h × 641,615.5682839388

With your value: 1 hp·h = 641,615.56828394 cal

How big is that?

Everyday references on a logarithmic scale, all expressed in horsepower-hour so you can sanity-check the result.

Heartbeat (1/2.7e+6 your value)3.73e-7 hp·h

AA battery charge (1/2.7e+2 your value)0.00373 hp·h

Slice of bread (1/9.6 your value)0.104 hp·h

Your value1.00 hp·h

Daily food intake (3.1× your value)3.13 hp·h

Litre of petrol (13× your value)12.7 hp·h

Other Horsepower-Hour to Calorie (th) conversions

2 hp·h to cal 3 hp·h to cal 4 hp·h to cal 5 hp·h to cal 6 hp·h to cal 7 hp·h to cal 8 hp·h to cal

Horsepower-Hour to Calorie (th) Conversion Table

Horsepower-Hour (hp·h)	Calorie (th) (cal)
0.5	320,807.784142
1	641,615.568284
2	1,283,231.136568
5	3,208,077.84142
10	6,416,155.682839
15	9,624,233.524259
20	12,832,311.365679
25	16,040,389.207098
50	32,080,778.414197
100	64,161,556.828394
250	160,403,892.070985
500	320,807,784.141969
1000	641,615,568.283939

Calorie (th) to Horsepower-Hour Conversion Table

Calorie (th) (cal)	Horsepower-Hour (hp·h)
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

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.

Horsepower-Hour (hp·h)

Energy

Exact conversion

Derived from the joule (1 J = 1 kg·m²/s²). Thermochemical and IT calories, BTU and kWh are exact defined multiples.

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

Calorie (th) (cal)

Energy

Exact conversion

The thermochemical calorie is exactly 4.184 J.

The International Table calorie (4.1868 J) and the 15 °C calorie differ slightly.

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 Horsepower-Hour to Calorie (th)

To convert from Horsepower-Hour (hp·h) to Calorie (th) (cal), multiply the value by 641,615.5682839388.

Formula: cal = hp·h × 641,615.5682839388

Reverse: hp·h = cal × 0.0000015586

Step-by-Step Example

Start with your value in Horsepower-Hour. For example: 5 hp·h
Multiply by the conversion factor: 5 x 641,615.5682839388
The result is: 3,208,077.84142 cal

About Horsepower-Hour

The horsepower-hour (hp·h) is a unit of energy and work. One horsepower-hour equals 2.684520 × 10^+6 joules. UnitConvertLab converts it against every other energy unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.

Common uses: energy calculations, engineering and science, education.

About Calorie (th)

The thermochemical calorie equals 4.184 joules. Not to be confused with the food Calorie (kcal), which equals 1,000 calories.

Common uses: chemistry, nutrition, heating.

Frequently Asked Questions

How many Calorie (th) are in 1 Horsepower-Hour?

There are exactly 641,615.5682839388 Calorie (th) in 1 Horsepower-Hour. This means the conversion factor from Horsepower-Hour to Calorie (th) is 641,615.5682839388.

What is the formula to convert Horsepower-Hour to Calorie (th)?

The formula to convert Horsepower-Hour to Calorie (th) is: cal = hp·h × 641,615.5682839388. For example, to convert 10 Horsepower-Hour to Calorie (th), you would multiply 10 by 641,615.5682839388.

What is a Horsepower-Hour?