Horsepower-Hour to Rydberg Converter

Energy Converter

27 units available

Decimals:

From

To

1.231503e+24

1 hp·h = 1.231503e+24 Ry

Formula:

Ry = hp·h × 1.231503e+24

With your value: 1 hp·h = 1.231503e+24 Ry

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 Rydberg conversions

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

Horsepower-Hour to Rydberg Conversion Table

Horsepower-Hour (hp·h)	Rydberg (Ry)
0.5	6.157516e+23
1	1.231503e+24
2	2.463007e+24
5	6.157516e+24
10	1.231503e+25
15	1.847255e+25
20	2.463007e+25
25	3.078758e+25
50	6.157516e+25
100	1.231503e+26
250	3.078758e+26
500	6.157516e+26
1000	1.231503e+27

Rydberg to Horsepower-Hour Conversion Table

Rydberg (Ry)	Horsepower-Hour (hp·h)
0.5	4.060078e-25
1	8.120157e-25
2	1.624031e-24
5	4.060078e-24
10	8.120157e-24
15	1.218024e-23
20	1.624031e-23
25	2.030039e-23
50	4.060078e-23
100	8.120157e-23
250	2.030039e-22
500	4.060078e-22
1000	8.120157e-22

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

Rydberg (Ry)

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 Rydberg

To convert from Horsepower-Hour (hp·h) to Rydberg (Ry), multiply the value by 1.231503e+24.

Formula: Ry = hp·h × 1.231503e+24

Reverse: hp·h = Ry × 8.120157e-25

Step-by-Step Example

Start with your value in Horsepower-Hour. For example: 5 hp·h
Multiply by the conversion factor: 5 x 1.231503e+24
The result is: 6.157516e+24 Ry

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 Rydberg

The rydberg (Ry) is a unit of energy and work. One rydberg equals 2.179872 × 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 Rydberg are in 1 Horsepower-Hour?

There are exactly 1.231503e+24 Rydberg in 1 Horsepower-Hour. This means the conversion factor from Horsepower-Hour to Rydberg is 1.231503e+24.

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

The formula to convert Horsepower-Hour to Rydberg is: Ry = hp·h × 1.231503e+24. For example, to convert 10 Horsepower-Hour to Rydberg, you would multiply 10 by 1.231503e+24.

What is a Horsepower-Hour?