Foot-pounds to Gigajoules Converter

One Foot-pound equals 1.355818e-9 Gigajoules (1 ft-lb = 1.355818e-9 GJ). Multiply a Foot-pound value by 1.355818e-9 to get the equivalent in Gigajoules. Enter a value above to calculate the result. You can also use the formula and reference table below.

Formula

GJ = ft-lb × 1.355818e-9

Multiply the Foot-pound value by 1.355818e-9 to get the equivalent value in Gigajoules.

Example Conversions

1 Foot-pound (ft-lb)

1.355818e-9 Gigajoule (GJ)

5 Foot-pound (ft-lb)

6.779090e-9 Gigajoule (GJ)

10 Foot-pound (ft-lb)

1.355818e-8 Gigajoule (GJ)

25 Foot-pound (ft-lb)

3.389545e-8 Gigajoule (GJ)

100 Foot-pound (ft-lb)

1.355818e-7 Gigajoule (GJ)

Conversion Table

Common conversion values from Foot-pound to Gigajoule
Foot-pound (ft-lb)Gigajoule (GJ)
0.11.355818e-10
0.56.779090e-10
11.355818e-9
22.711636e-9
56.779090e-9
101.355818e-8
253.389545e-8
506.779090e-8
1001.355818e-7
2503.389545e-7
5006.779090e-7
10000.000001355817948

How to Convert Manually

Use these steps to convert Foot-pound values to Gigajoule without the calculator.

  1. Write down the value in Foot-pound (ft-lb) that you want to convert.
  2. Multiply that value by 1.355818e-9.
  3. For example, 10 Foot-pounds × 1.355818e-9 = 1.355818e-8 Gigajoules.
  4. Label the result as Gigajoule (GJ).

Relative Size Comparison

1 Foot-pound
1 Gigajoule737562149.3 Foot-pounds
1 GJ

This chart shows the visual difference in size between exactly one Foot-pound and one Gigajoule.

About Foot-pound and Gigajoule

The foot-pound is about 1.3558 joules, the work of one pound-force through one foot. US mechanical engineering and firearm muzzle energy use foot-pounds. The gigajoule is one billion joules, roughly the energy in 26 liters of gasoline. District heating and industrial energy contracts bill in gigajoules. One Foot-pound equals 1.355818e-9 Gigajoules (1 ft-lb = 1.355818e-9 GJ). Foot-pound is used in US mechanical engineering and in firearm muzzle energy. Gigajoule is used in district heating bills.

Precision and Rounding:Energy factors mix exact definitions (1 kWh = 3,600,000 J; 1 cal = 4.184 J thermochemical) with measured conventions (1 BTU ≈ 1,055.056 J). Nutrition and utility bills round to whole units; engineering heat calculations should keep the full factor until the final step.

Conversion factors per NIST Special Publication 811 and the BIPM SI Brochure (9th edition) (reference).

Worked Example

15Foot-pounds equals2.033727e-8Gigajoules.

15 ft-lb × 1.355818e-9 = 2.033727e-8 GJ

FAQ

How do I convert Foot-pound to Gigajoule?

Multiply the Foot-pound value by 1.355818e-9 to get the equivalent value in Gigajoules.

What is the formula for Foot-pound to Gigajoule?

The formula is GJ = ft-lb × 1.355818e-9.

How many Gigajoules are in 1 Foot-pound?

1 Foot-pound equals 1.355818e-9 Gigajoules.

Can I convert Gigajoule back to Foot-pound?

Yes. 1 Gigajoule equals 737562149.3 Foot-pounds, and the related converter can reverse the calculation.

What are common names for Foot-pound and Gigajoule?

Foot-pound is shown as ft-lb and may also be searched as foot-pound, foot pound, ft·lb. Gigajoule is shown as GJ and may also be searched as gigajoule, gigajoules.

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