Foot-pound to Gigajoule Converter

One Foot-pound equals 1.355818e-9 Gigajoule (1 ft-lb = 1.355818e-9 GJ). Multiply a Foot-pound value by 1.355818e-9 to get the equivalent in Gigajoule. Use the calculator above for instant results, or follow the formula, worked examples, 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 Gigajoule.

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)
0.1 1.355818e-10
0.5 6.779090e-10
1 1.355818e-9
2 2.711636e-9
5 6.779090e-9
10 1.355818e-8
25 3.389545e-8
50 6.779090e-8
100 1.355818e-7
250 3.389545e-7
500 6.779090e-7
1000 0.000001355817948

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-pound × 1.355818e-9 = 1.355818e-8 Gigajoule.
  4. Label the result as Gigajoule (GJ).

Relative Size Comparison

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

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 Gigajoule (1 ft-lb = 1.355818e-9 GJ). Foot-pound to Gigajoule conversion comes up most often in US mechanical engineering and in firearm muzzle energy, typically when figures need restating for 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

15 Foot-pound equals 2.033727e-8 Gigajoule.

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 Gigajoule.

What is the formula for Foot-pound to Gigajoule?

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

How many Gigajoule are in 1 Foot-pound?

1 Foot-pound equals 1.355818e-9 Gigajoule.

Can I convert Gigajoule back to Foot-pound?

Yes. 1 Gigajoule equals 737562149.3 Foot-pound, 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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