Horsepower-Hour to Kilocalorie Converter

Energy Converter

27 units available

Decimals:

From

To

641.615568

1 hp·h = 641.615568 kcal

Formula:

kcal = hp·h × 641.6155682839

With your value: 1 hp·h = 641.61556828 kcal

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 Kilocalorie conversions

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

Horsepower-Hour to Kilocalorie Conversion Table

Horsepower-Hour (hp·h)	Kilocalorie (kcal)
0.5	320.807784
1	641.615568
2	1,283.231137
5	3,208.077841
10	6,416.155683
15	9,624.233524
20	12,832.311366
25	16,040.389207
50	32,080.778414
100	64,161.556828
250	160,403.892071
500	320,807.784142
1000	641,615.568284

Kilocalorie to Horsepower-Hour Conversion Table

Kilocalorie (kcal)	Horsepower-Hour (hp·h)
0.5	0.000779
1	0.001559
2	0.003117
5	0.007793
10	0.015586
15	0.023378
20	0.031171
25	0.038964
50	0.077928
100	0.155857
250	0.389641
500	0.779283
1000	1.558566

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

Kilocalorie (kcal)

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

How to Convert Horsepower-Hour to Kilocalorie

To convert from Horsepower-Hour (hp·h) to Kilocalorie (kcal), multiply the value by 641.6155682839.

Formula: kcal = hp·h × 641.6155682839

Reverse: hp·h = kcal × 0.0015585657

Step-by-Step Example

Start with your value in Horsepower-Hour. For example: 5 hp·h
Multiply by the conversion factor: 5 x 641.6155682839
The result is: 3,208.077841 kcal

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 Kilocalorie

The kilocalorie (food Calorie) equals 1,000 calories or 4,184 joules. It is the standard unit for food energy content.

Common uses: nutrition, diet, food labeling.

Frequently Asked Questions

How many Kilocalorie are in 1 Horsepower-Hour?

There are exactly 641.6155682839 Kilocalorie in 1 Horsepower-Hour. This means the conversion factor from Horsepower-Hour to Kilocalorie is 641.6155682839.

What is the formula to convert Horsepower-Hour to Kilocalorie?

The formula to convert Horsepower-Hour to Kilocalorie is: kcal = hp·h × 641.6155682839. For example, to convert 10 Horsepower-Hour to Kilocalorie, you would multiply 10 by 641.6155682839.

What is a Horsepower-Hour?