BTU (IT) to Rydberg Converter

Energy Converter

27 units available

Decimals:

From

To

4.839990e+20

1 BTU (IT) = 4.839990e+20 Ry

Formula:

Ry = BTU (IT) × 4.839990e+20

With your value: 1 BTU (IT) = 4.839990e+20 Ry

How big is that?

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

Heartbeat (1/1.1e+3 your value)0.000948 BTU (IT)

Your value1.00 BTU (IT)

AA battery charge (9.5× your value)9.48 BTU (IT)

Slice of bread (2.7e+2× your value)265 BTU (IT)

Daily food intake (8.0e+3× your value)7.96e+3 BTU (IT)

Litre of petrol (3.2e+4× your value)3.24e+4 BTU (IT)

Other BTU (IT) to Rydberg conversions

2 BTU (IT) to Ry 3 BTU (IT) to Ry 4 BTU (IT) to Ry 5 BTU (IT) to Ry 6 BTU (IT) to Ry 7 BTU (IT) to Ry 8 BTU (IT) to Ry

BTU (IT) to Rydberg Conversion Table

BTU (IT) (BTU (IT))	Rydberg (Ry)
0.5	2.419995e+20
1	4.839990e+20
2	9.679980e+20
5	2.419995e+21
10	4.839990e+21
15	7.259985e+21
20	9.679980e+21
25	1.209997e+22
50	2.419995e+22
100	4.839990e+22
250	1.209997e+23
500	2.419995e+23
1000	4.839990e+23

Rydberg to BTU (IT) Conversion Table

Rydberg (Ry)	BTU (IT) (BTU (IT))
0.5	1.033060e-21
1	2.066120e-21
2	4.132240e-21
5	1.033060e-20
10	2.066120e-20
15	3.099180e-20
20	4.132240e-20
25	5.165300e-20
50	1.033060e-19
100	2.066120e-19
250	5.165300e-19
500	1.033060e-18
1000	2.066120e-18

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.

BTU (IT) (BTU (IT))

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 BTU (IT) to Rydberg

To convert from BTU (IT) (BTU (IT)) to Rydberg (Ry), multiply the value by 4.839990e+20.

Formula: Ry = BTU (IT) × 4.839990e+20

Reverse: BTU (IT) = Ry × 2.066120e-21

Step-by-Step Example

Start with your value in BTU (IT). For example: 5 BTU (IT)
Multiply by the conversion factor: 5 x 4.839990e+20
The result is: 2.419995e+21 Ry

About BTU (IT)

The btu (it) (BTU (IT)) is a unit of energy and work. One btu (it) equals 1055.055853 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 BTU (IT)?

There are exactly 4.839990e+20 Rydberg in 1 BTU (IT). This means the conversion factor from BTU (IT) to Rydberg is 4.839990e+20.

What is the formula to convert BTU (IT) to Rydberg?

The formula to convert BTU (IT) to Rydberg is: Ry = BTU (IT) × 4.839990e+20. For example, to convert 10 BTU (IT) to Rydberg, you would multiply 10 by 4.839990e+20.

What is a BTU (IT)?