BTU (th) to Foot-Pound Converter

Energy Converter

27 units available

Decimals:

From

To

777.648652

1 BTU = 777.648652 ft·lbf

Formula:

ft·lbf = BTU × 777.6486521085

With your value: 1 BTU = 777.64865211 ft·lbf

How big is that?

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

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

Your value1.00 BTU

AA battery charge (9.5× your value)9.48 BTU

Slice of bread (2.7e+2× your value)266 BTU

Daily food intake (8.0e+3× your value)7.97e+3 BTU

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

Other BTU (th) to Foot-Pound conversions

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

BTU (th) to Foot-Pound Conversion Table

BTU (th) (BTU)	Foot-Pound (ft·lbf)
0.5	388.824326
1	777.648652
2	1,555.297304
5	3,888.243261
10	7,776.486521
15	11,664.729782
20	15,552.973042
25	19,441.216303
50	38,882.432605
100	77,764.865211
250	194,412.163027
500	388,824.326054
1000	777,648.652108

Foot-Pound to BTU (th) Conversion Table

Foot-Pound (ft·lbf)	BTU (th) (BTU)
0.5	0.000643
1	0.001286
2	0.002572
5	0.00643
10	0.012859
15	0.019289
20	0.025719
25	0.032148
50	0.064296
100	0.128593
250	0.321482
500	0.642964
1000	1.285928

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 (th) (BTU)

Energy

Exact conversion

The International Table BTU is exactly 1055.055 852 62 J.

Thermochemical and 39 °F BTU definitions differ by up to 0.2 %.

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 BTU (th) to Foot-Pound

To convert from BTU (th) (BTU) to Foot-Pound (ft·lbf), multiply the value by 777.6486521085.

Formula: ft·lbf = BTU × 777.6486521085

Reverse: BTU = ft·lbf × 0.0012859278

Step-by-Step Example

Start with your value in BTU (th). For example: 5 BTU
Multiply by the conversion factor: 5 x 777.6486521085
The result is: 3,888.243261 ft·lbf

About BTU (th)

The btu (th) (BTU) is a unit of energy and work. One btu (th) equals 1054.35 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 BTU (th)?

There are exactly 777.6486521085 Foot-Pound in 1 BTU (th). This means the conversion factor from BTU (th) to Foot-Pound is 777.6486521085.

What is the formula to convert BTU (th) to Foot-Pound?

The formula to convert BTU (th) to Foot-Pound is: ft·lbf = BTU × 777.6486521085. For example, to convert 10 BTU (th) to Foot-Pound, you would multiply 10 by 777.6486521085.

What is a BTU (th)?