Foot-Pound/Second to BTU/Second Converter

Power Converter

22 units available

Decimals:

From

To

0.001285

1 ft·lbf/s = 0.001285 BTU/s

Formula:

BTU/s = ft·lbf/s × 0.0012850675

With your value: 1 ft·lbf/s = 0.00128507 BTU/s

How big is that?

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

Your value1.00 ft·lbf/s

LED bulb (6.6× your value)6.64 ft·lbf/s

Laptop (48× your value)47.9 ft·lbf/s

Microwave oven (7.4e+2× your value)738 ft·lbf/s

Electric kettle (2.2e+3× your value)2.21e+3 ft·lbf/s

Family car engine (6.6e+4× your value)6.64e+4 ft·lbf/s

Other Foot-Pound/Second to BTU/Second conversions

2 ft·lbf/s to BTU/s 3 ft·lbf/s to BTU/s 4 ft·lbf/s to BTU/s 5 ft·lbf/s to BTU/s 6 ft·lbf/s to BTU/s 7 ft·lbf/s to BTU/s 8 ft·lbf/s to BTU/s

Foot-Pound/Second to BTU/Second Conversion Table

Foot-Pound/Second (ft·lbf/s)	BTU/Second (BTU/s)
0.5	0.000643
1	0.001285
2	0.00257
5	0.006425
10	0.012851
15	0.019276
20	0.025701
25	0.032127
50	0.064253
100	0.128507
250	0.321267
500	0.642534
1000	1.285067

BTU/Second to Foot-Pound/Second Conversion Table

BTU/Second (BTU/s)	Foot-Pound/Second (ft·lbf/s)
0.5	389.084631
1	778.169262
2	1,556.338525
5	3,890.846311
10	7,781.692623
15	11,672.538934
20	15,563.385246
25	19,454.231557
50	38,908.463114
100	77,816.926228
250	194,542.315571
500	389,084.631142
1000	778,169.262284

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.

Foot-Pound/Second (ft·lbf/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 Foot-Pound/Second to BTU/Second

To convert from Foot-Pound/Second (ft·lbf/s) to BTU/Second (BTU/s), multiply the value by 0.0012850675.

Formula: BTU/s = ft·lbf/s × 0.0012850675

Reverse: ft·lbf/s = BTU/s × 778.169262284

Step-by-Step Example

Start with your value in Foot-Pound/Second. For example: 5 ft·lbf/s
Multiply by the conversion factor: 5 x 0.0012850675
The result is: 0.006425 BTU/s

About Foot-Pound/Second

The foot-pound/second (ft·lbf/s) is a unit of power. One foot-pound/second equals 1.355817948 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.

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 Foot-Pound/Second?

There are exactly 0.0012850675 BTU/Second in 1 Foot-Pound/Second. This means the conversion factor from Foot-Pound/Second to BTU/Second is 0.0012850675.

What is the formula to convert Foot-Pound/Second to BTU/Second?

The formula to convert Foot-Pound/Second to BTU/Second is: BTU/s = ft·lbf/s × 0.0012850675. For example, to convert 10 Foot-Pound/Second to BTU/Second, you would multiply 10 by 0.0012850675.

What is a Foot-Pound/Second?