Enter a value in foot-pound-force (ft·lbf) in the "From" field, and the equivalent value in British thermal unit (BTU) will be displayed in the "To" field automatically.

The conversion factor between foot-pound-force and British thermal unit is calculated automatically based on their relationship to the base unit in the energy / work / heat category.

Yes, you can convert between any units in the energy / work / heat category. Use the dropdown menus to select different units.