US therm used for natural gas energy.
US therms to Foot-pounds Converter — therm to ft-lb
Convert US therm (therm) to Foot-pound (ft-lb) using the exact conversion factor (1 us therm = 77,798,350.53 foot-pound). See the formula, worked examples, and conversion table.
US therms to Foot-pounds converter
Converter
Engineering Converter
Convert common stress, force, torque, power, and energy units used in engineering.
Context values
Some unit families need one extra value for a physically accurate result.
Work from one pound-force over one foot.
Result = input x 1.054804e+8 / 1.355817948.
Energy units are compatible.
Reserved above the conversion cards and below the converter.
About Converting US therms to Foot-pounds
US therm and Foot-pound both measure a quantity used in structural or mechanical engineering — commonly stress, pressure, force, torque, power, or energy — where converting between the unit conventions used in different regions, industries, or equipment specifications is a routine part of design work. Specifically: US therm used for natural gas energy, and work from one pound-force over one foot.
Formula
foot-pounds = us therms × 77798350.5306
This factor comes from each unit's defined relationship to the category's base unit: 1 us therm equals 105480400 base units, and 1 foot-pound equals 1.35581794833 base units, so dividing one by the other gives the direct us therm-to-foot-pound factor of 77798350.5306.
Simple example
1 therm × 77798350.53 = 77,798,350.53 ft-lb
1 us therm = 77,798,350.53 foot-pounds.
Real-world example
100 therm × 77798350.53 = 7,779,835,053 ft-lb
100 us therms = 7,779,835,053 foot-pounds.
Conversion table
| US therm (therm) | Foot-pound (ft-lb) |
|---|---|
| 1 therm | 77,798,350.53 ft-lb |
| 10 therm | 777,983,505.3 ft-lb |
| 50 therm | 3,889,917,527 ft-lb |
| 100 therm | 7,779,835,053 ft-lb |
| 500 therm | 38,899,175,270 ft-lb |
| 1,000 therm | 77,798,350,530 ft-lb |
Reverse conversion: Foot-pound to US therm
1 ft-lb × 1.285374e-8 = 1.285374e-8 therm
1 foot-pound = 1.285374e-8 us therms.
us therms = foot-pounds × 1.285374e-8
For a page dedicated to this direction, see Foot-pound to US therm.
Understanding the US therm (therm)
US therm used for natural gas energy.
Understanding the Foot-pound (ft-lb)
Work from one pound-force over one foot.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many foot-pounds are in 1 us therm?
1 us therm equals 77,798,350.53 foot-pounds, using the exact defined conversion factor rather than an estimate.
How do I convert us therm to foot-pound?
Multiply the us therm value by 77798350.53. The converter above does this instantly to whatever precision you set.
How do I convert foot-pound back to us therm?
Use the reverse factor: 1 foot-pound equals 1.285374e-8 us therms. You can also use the swap control in the converter above to flip the direction instantly.
What is a us therm?
US therm (therm) is a unit of engineering.
What is a foot-pound?
Foot-pound (ft-lb) is a unit of engineering.
Is the us therm to foot-pound conversion exact?
Yes. Both us therm and foot-pound are defined by fixed standards rather than physical artifacts, so the factor of 77798350.53 used above is exact to as many digits as you choose to display.
Why do engineering unit conventions vary so much by region and industry?
Pressure, force, and stress can be expressed in metric (pascal, newton), US customary (psi, pound-force), or older and industry-specific units (atmosphere, torr, kip) depending on the country, industry, and even the equipment manufacturer, which is why engineers routinely need to convert between them when working across specs from different sources.