Foot-pounds to Gigajoules Converter
Enter the energy in foot-pounds below to convert it to gigajoules.
Convert Foot-pounds to Gigajoules
Enter a value in foot-pounds (ft·lbf) to convert to gigajoules (GJ).
Foot-pound to Gigajoule Conversion Table
Table showing various foot-pound measurements converted to gigajoules. Click any preset value or arrow to load it into the converter.
| Foot-pounds (ft·lbf) | Gigajoules (GJ) |
|---|---|
| 1 ft·lbf | 1.355818e-9 GJ |
| 10 ft·lbf | 0.000000014 GJ |
| 100 ft·lbf | 0.000000136 GJ |
| 1,000 ft·lbf | 0.000001356 GJ |
| 10,000 ft·lbf | 0.000013558 GJ |
| 100,000 ft·lbf | 0.000135582 GJ |
| 1,000,000 ft·lbf | 0.0013558 GJ |
| 5,000,000 ft·lbf | 0.0067791 GJ |
| 10,000,000 ft·lbf | 0.0135582 GJ |
| 25,400,000 ft·lbf | 0.0344378 GJ |
How to Convert Foot-pounds to Gigajoules
To convert foot-pounds to gigajoules, multiply the energy by the following conversion ratio: 1.355818e-9 gigajoules/foot-pound.
Since one foot-pound is equal to 1.355818e-9 gigajoules, you can use this simple formula to convert:
The energy in gigajoules is equal to the energy in foot-pounds multiplied by 1.355818e-9.
For example, here's how to convert 5 foot-pounds to gigajoules using the formula above.
How Many Gigajoules Are in a Foot-pound?
There are 1.355818e-9 gigajoules in a foot-pound, which is why we use this value in the formula above.
Our foot-pound to gigajoule calculator automatically converts your energy measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Foot-pounds and gigajoules 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 Gigajoule?
A gigajoule is a unit of energy equal to 1,000,000,000 joules (J), the base unit for energy. Equal to 1,000,000,000 Joules, common in natural gas billing. [2]
The gigajoule is classified as an International System of Units (SI) unit of energy. Gigajoules can be abbreviated as GJ; for example, 1 gigajoule can be written as 1 GJ.
In the metric system, "giga" is the standard SI prefix for billions, or 10⁹. This makes the gigajoule (GJ) a convenient decimal multiple of the joule (J).
In practice, gigajoules (GJ) are widely used across large-scale industrial, bulk, and macro-level energy specifications within International System of Units (SI) workflows, engineering documentation, and technical data sheets.
When converting energy between foot-pounds (ft·lbf) and gigajoules (GJ), keep full floating-point precision (1 ft·lbf = 1.355818e-9 GJ; 1 GJ = 737,562,149.2772657 ft·lbf) during intermediate calculations and round only the final gigajoule figure to match your instrument tolerance.
More Foot-pound & Gigajoule Conversions
Need to calculate in the opposite direction? Use our gigajoules to foot-pounds calculator to switch your starting unit immediately. You can also explore related tools such as converting gigajoules 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 Gigajoules (GJ)
- [2]NIST SP 811 SpecificationNIST SP 811 (NIST SP 811 App. B.9 (Energy, Work & Heat))·Unit Specifications: Foot-pound (ft·lbf) (ft·lbf) & Gigajoule (GJ)
- [3]BIPM ReferenceBIPM (Derived SI Unit: Joule (J))·Conversion Factors & Mathematical Basis (ft·lbf to GJ)