Rydberg to Foot-Pound Converter

Energy Converter

27 units available

Decimals:

From

To

1.607791e-18

1 Ry = 1.607791e-18 ft·lbf

Formula:

ft·lbf = Ry × 1.607791e-18

With your value: 1 Ry = 1.607791e-18 ft·lbf

How big is that?

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

Your value1.00 Ry

Heartbeat (4.6e+17× your value)4.59e+17 Ry

AA battery charge (4.6e+21× your value)4.59e+21 Ry

Slice of bread (1.3e+23× your value)1.28e+23 Ry

Daily food intake (3.9e+24× your value)3.85e+24 Ry

Litre of petrol (1.6e+25× your value)1.57e+25 Ry

Other Rydberg to Foot-Pound conversions

2 Ry to ft·lbf 3 Ry to ft·lbf 4 Ry to ft·lbf 5 Ry to ft·lbf 6 Ry to ft·lbf 7 Ry to ft·lbf 8 Ry to ft·lbf

Rydberg to Foot-Pound Conversion Table

Rydberg (Ry)	Foot-Pound (ft·lbf)
0.5	8.038955e-19
1	1.607791e-18
2	3.215582e-18
5	8.038955e-18
10	1.607791e-17
15	2.411687e-17
20	3.215582e-17
25	4.019478e-17
50	8.038955e-17
100	1.607791e-16
250	4.019478e-16
500	8.038955e-16
1000	1.607791e-15

Foot-Pound to Rydberg Conversion Table

Foot-Pound (ft·lbf)	Rydberg (Ry)
0.5	3.109857e+17
1	6.219714e+17
2	1.243943e+18
5	3.109857e+18
10	6.219714e+18
15	9.329570e+18
20	1.243943e+19
25	1.554928e+19
50	3.109857e+19
100	6.219714e+19
250	1.554928e+20
500	3.109857e+20
1000	6.219714e+20

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.

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

Foot-Pound (ft·lbf)

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 Rydberg to Foot-Pound

To convert from Rydberg (Ry) to Foot-Pound (ft·lbf), multiply the value by 1.607791e-18.

Formula: ft·lbf = Ry × 1.607791e-18

Reverse: Ry = ft·lbf × 6.219714e+17

Step-by-Step Example

Start with your value in Rydberg. For example: 5 Ry
Multiply by the conversion factor: 5 x 1.607791e-18
The result is: 8.038955e-18 ft·lbf

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.

About Foot-Pound

The foot-pound (ft·lbf) is a unit of energy and work. One foot-pound equals 1.355817948 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 Foot-Pound are in 1 Rydberg?

There are exactly 1.607791e-18 Foot-Pound in 1 Rydberg. This means the conversion factor from Rydberg to Foot-Pound is 1.607791e-18.

What is the formula to convert Rydberg to Foot-Pound?

The formula to convert Rydberg to Foot-Pound is: ft·lbf = Ry × 1.607791e-18. For example, to convert 10 Rydberg to Foot-Pound, you would multiply 10 by 1.607791e-18.

What is a Rydberg?