Horsepower-Hour to Hartree Converter

Energy Converter

27 units available

Decimals:

From

To

6.157515e+23

1 hp·h = 6.157515e+23 Eh

Formula:

Eh = hp·h × 6.157515e+23

With your value: 1 hp·h = 6.157515e+23 Eh

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 Hartree conversions

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

Horsepower-Hour to Hartree Conversion Table

Horsepower-Hour (hp·h)	Hartree (Eh)
0.5	3.078758e+23
1	6.157515e+23
2	1.231503e+24
5	3.078758e+24
10	6.157515e+24
15	9.236273e+24
20	1.231503e+25
25	1.539379e+25
50	3.078758e+25
100	6.157515e+25
250	1.539379e+26
500	3.078758e+26
1000	6.157515e+26

Hartree to Horsepower-Hour Conversion Table

Hartree (Eh)	Horsepower-Hour (hp·h)
0.5	8.120158e-25
1	1.624032e-24
2	3.248063e-24
5	8.120158e-24
10	1.624032e-23
15	2.436047e-23
20	3.248063e-23
25	4.060079e-23
50	8.120158e-23
100	1.624032e-22
250	4.060079e-22
500	8.120158e-22
1000	1.624032e-21

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

Hartree (Eh)

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 Hartree

To convert from Horsepower-Hour (hp·h) to Hartree (Eh), multiply the value by 6.157515e+23.

Formula: Eh = hp·h × 6.157515e+23

Reverse: hp·h = Eh × 1.624032e-24

Step-by-Step Example

Start with your value in Horsepower-Hour. For example: 5 hp·h
Multiply by the conversion factor: 5 x 6.157515e+23
The result is: 3.078758e+24 Eh

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 Hartree

The hartree (Eh) is a unit of energy and work. One hartree equals 4.359745 × 10^-18 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.

Frequently Asked Questions

How many Hartree are in 1 Horsepower-Hour?

There are exactly 6.157515e+23 Hartree in 1 Horsepower-Hour. This means the conversion factor from Horsepower-Hour to Hartree is 6.157515e+23.

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

The formula to convert Horsepower-Hour to Hartree is: Eh = hp·h × 6.157515e+23. For example, to convert 10 Horsepower-Hour to Hartree, you would multiply 10 by 6.157515e+23.

What is a Horsepower-Hour?