Foot-pounds to Millijoules Converter
Enter the energy in foot-pounds below to convert it to millijoules.
Convert Foot-pounds to Millijoules
Enter a value in foot-pounds (ft·lbf) to convert to millijoules (mJ).
Foot-pound to Millijoule Conversion Table
Table showing various foot-pound measurements converted to millijoules. Click any preset value or arrow to load it into the converter.
| Foot-pounds (ft·lbf) | Millijoules (mJ) |
|---|---|
| 1 ft·lbf | 1,355.8179483 mJ |
| 2 ft·lbf | 2,711.6358967 mJ |
| 2.5 ft·lbf | 3,389.5448708 mJ |
| 5 ft·lbf | 6,779.0897417 mJ |
| 10 ft·lbf | 13,558.1794833 mJ |
| 15 ft·lbf | 20,337.269225 mJ |
| 20 ft·lbf | 27,116.3589666 mJ |
| 25 ft·lbf | 33,895.4487083 mJ |
| 30 ft·lbf | 40,674.5384499 mJ |
| 50 ft·lbf | 67,790.8974166 mJ |
How to Convert Foot-pounds to Millijoules
To convert foot-pounds to millijoules, multiply the energy by the following conversion ratio: 1,355.8179483 millijoules/foot-pound.
Since one foot-pound is equal to 1,355.8179483 millijoules, you can use this simple formula to convert:
The energy in millijoules is equal to the energy in foot-pounds multiplied by 1,355.8179483.
For example, here's how to convert 5 foot-pounds to millijoules using the formula above.
How Many Millijoules Are in a Foot-pound?
There are 1,355.8179483 millijoules in a foot-pound, which is why we use this value in the formula above.
Our foot-pound to millijoule calculator automatically converts your energy measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Foot-pounds and millijoules are both units used to measure energy. Keep reading to learn more about each unit.
What Is a Foot-pound?
A foot-pound is a unit of energy equal to 1.3558179 joules (J), the base unit for energy. Mechanical work unit equal to 1.355818 Joules. [1]
The foot-pound is classified as a US customary and imperial unit of energy. Foot-pounds can be abbreviated as ft·lbf; for example, 1 foot-pound can be written as 1 ft·lbf.
When working with foot-pounds (ft·lbf) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.
In practice, foot-pounds (ft·lbf) are widely used across standard energy applications within US customary and imperial workflows, engineering documentation, and technical data sheets.
What Is a Millijoule?
A millijoule is a unit of energy equal to 1/1,000 of a joule (0.001 J). One-thousandth of a Joule. [2]
The millijoule is classified as a metric and SI-compatible unit of energy. Millijoules can be abbreviated as mJ; for example, 1 millijoule can be written as 1 mJ.
In the metric system, "milli" is the standard SI prefix for thousandths, or 10⁻³. This makes the millijoule (mJ) a convenient decimal multiple of the joule (J).
In practice, millijoules (mJ) are widely used across fine-tolerance laboratory, analytical, and micro-scale energy measurements within SI metric workflows, engineering documentation, and technical data sheets.
When converting energy between foot-pounds (ft·lbf) and millijoules (mJ), keep full floating-point precision (1 ft·lbf = 1,355.8179483 mJ; 1 mJ = 0.000737562 ft·lbf) during intermediate calculations and round only the final millijoule figure to match your instrument tolerance.
More Foot-pound & Millijoule Conversions
Need to calculate in the opposite direction? Use our millijoules to foot-pounds calculator to switch your starting unit immediately. You can also explore related tools such as converting millijoules to foot-pounds, converting foot-pounds to joules, or converting joules to calories.
Convert from Foot-pounds
Frequently Asked Questions
References
- [1]NIST CODATA StandardNIST CODATA (CODATA Energy & Thermodynamic Constants)·Energy Metrology Standard — Foot-pounds (ft·lbf) to Millijoules (mJ)
- [2]NIST SP 811 SpecificationNIST SP 811 (NIST SP 811 App. B.9 (Energy, Work & Heat))·Unit Specifications: Foot-pound (ft·lbf) (ft·lbf) & Millijoule (mJ)
- [3]BIPM ReferenceBIPM (Derived SI Unit: Joule (J))·Conversion Factors & Mathematical Basis (ft·lbf to mJ)