Horsepower (Boiler) to Kilojoule/Hour Converter

Power Converter

22 units available

Decimals:

From

To

35,314.2

1 hp (S) = 35,314.2 kJ/h

Formula:

kJ/h = hp (S) × 35,314.2

With your value: 1 hp (S) = 35,314.2 kJ/h

How big is that?

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

LED bulb (1/1.1e+3 your value)0.000917 hp (S)

Laptop (1/1.5e+2 your value)0.00663 hp (S)

Microwave oven (1/9.8 your value)0.102 hp (S)

Electric kettle (1/3.3 your value)0.306 hp (S)

Your value1.00 hp (S)

Family car engine (9.2× your value)9.17 hp (S)

Other Horsepower (Boiler) to Kilojoule/Hour conversions

2 hp (S) to kJ/h 3 hp (S) to kJ/h 4 hp (S) to kJ/h 5 hp (S) to kJ/h 6 hp (S) to kJ/h 7 hp (S) to kJ/h 8 hp (S) to kJ/h

Horsepower (Boiler) to Kilojoule/Hour Conversion Table

Horsepower (Boiler) (hp (S))	Kilojoule/Hour (kJ/h)
0.5	17,657.1
1	35,314.2
2	70,628.4
5	176,571
10	353,142
15	529,713
20	706,284
25	882,855
50	1,765,710
100	3,531,420
250	8,828,550
500	17,657,100
1000	35,314,200

Kilojoule/Hour to Horsepower (Boiler) Conversion Table

Kilojoule/Hour (kJ/h)	Horsepower (Boiler) (hp (S))
0.5	1.415861e-5
1	2.831722e-5
2	5.663444e-5
5	0.000142
10	0.000283
15	0.000425
20	0.000566
25	0.000708
50	0.001416
100	0.002832
250	0.007079
500	0.014159
1000	0.028317

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 (Boiler) (hp (S))

Power

Exact conversion

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

Kilojoule/Hour (kJ/h)

Power

Exact conversion

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

How to Convert Horsepower (Boiler) to Kilojoule/Hour

To convert from Horsepower (Boiler) (hp (S)) to Kilojoule/Hour (kJ/h), multiply the value by 35,314.2.

Formula: kJ/h = hp (S) × 35,314.2

Reverse: hp (S) = kJ/h × 0.0000283172

Step-by-Step Example

Start with your value in Horsepower (Boiler). For example: 5 hp (S)
Multiply by the conversion factor: 5 x 35,314.2
The result is: 176,571 kJ/h

About Horsepower (Boiler)

The horsepower (boiler) (hp (S)) is a unit of power. One horsepower (boiler) equals 9809.5 watts. UnitConvertLab converts it against every other power unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.

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

About Kilojoule/Hour

The kilojoule/hour (kJ/h) is a unit of power. One kilojoule/hour equals 0.2777777778 watts. UnitConvertLab converts it against every other power unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.

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

Frequently Asked Questions

How many Kilojoule/Hour are in 1 Horsepower (Boiler)?

There are exactly 35,314.2 Kilojoule/Hour in 1 Horsepower (Boiler). This means the conversion factor from Horsepower (Boiler) to Kilojoule/Hour is 35,314.2.

What is the formula to convert Horsepower (Boiler) to Kilojoule/Hour?

The formula to convert Horsepower (Boiler) to Kilojoule/Hour is: kJ/h = hp (S) × 35,314.2. For example, to convert 10 Horsepower (Boiler) to Kilojoule/Hour, you would multiply 10 by 35,314.2.

What is a Horsepower (Boiler)?