How many calories are in one foot-pound?

1 foot-pound (ft·lbf) = 0.324048 thermochemical calories (cal). This follows from 1 ft·lbf = 1.35581794833 J and 1 J = 1 ÷ 4.184 cal, giving 1.35581794833 ÷ 4.184 ≈ 0.324048 cal.

How many kilocalories are in one foot-pound?

1 ft·lbf = 0.000324048 kilocalories (kcal). Since 1 kcal = 1,000 cal, divide 0.324048 cal by 1,000.

What is the conversion formula from foot-pounds to calories?

cal = ft·lbf × 0.324048. For kilocalories: kcal = ft·lbf × 0.000324048. To reverse: ft·lbf = cal × 3.08596.

What type of calorie does this tool use?

This tool uses the thermochemical calorie (cal_th), equal to exactly 4.184 joules. This is the standard calorie in chemistry. The food Calorie (capital C) is a kilocalorie (kcal = 1,000 cal).

When would I need to convert foot-pounds to calories?

This conversion appears in ballistics (muzzle energy), mechanical engineering (comparing heat and work), and physics coursework that mixes US customary and SI unit systems.

Is foot-pound the same as pound-foot?

Foot-pound (ft·lbf) and pound-foot (lb·ft) refer to the same magnitude. "Foot-pound" is the conventional term for energy and work; "pound-foot" is used for torque in automotive contexts, but the unit size is identical.

Foot Pounds to Calories Converter

Name: Foot Pounds to Calories Converter
Availability: InStock
Author: Nham Vu

Enter foot-pounds (ft·lbf) and get the equivalent in thermochemical calories (cal) and kilocalories (kcal) instantly.

Foot-Pounds ↔ Calories Converter

Foot-Pounds (ft·lbf)

ft·lbf

⇅

Calories (cal) — thermochemical

cal

Kilocalories (kcal) — food Calories

kcal

1 ft·lbf = 0.324048 cal — 1 cal = 3.08596 ft·lbf

Quick Reference Table

Common foot-pound values in calories (1 ft·lbf = 0.324048 cal)

Foot-Pounds (ft·lbf)	cal	kcal

1 ft·lbf = 1.35582 J × (1 cal / 4.184 J) = 0.324048 cal (thermochemical)

Real-world energy references

1 ft·lbf ≈ 0.324 cal — lifting a 1 lb book 1 foot
9 mm pistol muzzle energy (~416 ft·lbf): ~135 cal
.308 rifle muzzle energy (~2,600 ft·lbf): ~843 cal
1 kcal (food Calorie) = 3,086 ft·lbf of mechanical equivalent
Daily human diet (~2,000 kcal): ~6.17 million ft·lbf of chemical energy

Summary

Enter foot-pounds (ft·lbf) and get the equivalent in thermochemical calories (cal) and kilocalories (kcal) instantly.

How it works

Enter a value in the Foot-Pounds (ft·lbf) field to see the calorie and kilocalorie equivalents.
Enter a value in the Calories (cal) field to reverse-convert to foot-pounds.
Enter a value in the Kilocalories (kcal) field to convert food Calories to ft·lbf.
All three fields update simultaneously — no button click required.
Click any row in the reference table to load that value into the converter.

Use cases

Convert muzzle energy (ft·lbf) from ballistics data into caloric equivalents for physics coursework.
Translate mechanical work figures in imperial units to thermochemical calories for chemistry lab reports.
Compare engine or motor output expressed in ft·lbf against dietary energy values in kcal.
Cross-check calorimetry data when mixing US customary and SI unit systems.
Verify that kinetic energy calculations in ft·lbf match expected thermochemical calorie values.

Frequently Asked Questions

Last updated: 2026-07-23 · Reviewed by Nham Vu