Joule/Second to BTU/Second Converter

Power Converter

22 units available

Decimals:

From

To

0.000948

1 J/s = 0.000948 BTU/s

Formula:

BTU/s = J/s × 0.0009478171

With your value: 1 J/s = 0.00094782 BTU/s

How big is that?

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

Your value1.00 J/s

LED bulb (9.0× your value)9.00 J/s

Laptop (65× your value)65.0 J/s

Microwave oven (1.0e+3× your value)1.00e+3 J/s

Electric kettle (3.0e+3× your value)3.00e+3 J/s

Family car engine (9.0e+4× your value)9.00e+4 J/s

Other Joule/Second to BTU/Second conversions

2 J/s to BTU/s 3 J/s to BTU/s 4 J/s to BTU/s 5 J/s to BTU/s 6 J/s to BTU/s 7 J/s to BTU/s 8 J/s to BTU/s

Joule/Second to BTU/Second Conversion Table

Joule/Second (J/s)	BTU/Second (BTU/s)
0.5	0.000474
1	0.000948
2	0.001896
5	0.004739
10	0.009478
15	0.014217
20	0.018956
25	0.023695
50	0.047391
100	0.094782
250	0.236954
500	0.473909
1000	0.947817

BTU/Second to Joule/Second Conversion Table

BTU/Second (BTU/s)	Joule/Second (J/s)
0.5	527.527926
1	1,055.055853
2	2,110.111705
5	5,275.279263
10	10,550.558526
15	15,825.837789
20	21,101.117052
25	26,376.396316
50	52,752.792631
100	105,505.585262
250	263,763.963155
500	527,527.92631
1000	1,055,055.85262

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.

Joule/Second (J/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

BTU/Second (BTU/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

How to Convert Joule/Second to BTU/Second

To convert from Joule/Second (J/s) to BTU/Second (BTU/s), multiply the value by 0.0009478171.

Formula: BTU/s = J/s × 0.0009478171

Reverse: J/s = BTU/s × 1,055.05585262

Step-by-Step Example

Start with your value in Joule/Second. For example: 5 J/s
Multiply by the conversion factor: 5 x 0.0009478171
The result is: 0.004739 BTU/s

About Joule/Second

The joule/second (J/s) is a unit of power. One joule/second equals 1 watt. 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 BTU/Second

The btu/second (BTU/s) is a unit of power. One btu/second equals 1055.055853 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 BTU/Second are in 1 Joule/Second?

There are exactly 0.0009478171 BTU/Second in 1 Joule/Second. This means the conversion factor from Joule/Second to BTU/Second is 0.0009478171.

What is the formula to convert Joule/Second to BTU/Second?

The formula to convert Joule/Second to BTU/Second is: BTU/s = J/s × 0.0009478171. For example, to convert 10 Joule/Second to BTU/Second, you would multiply 10 by 0.0009478171.

What is a Joule/Second?