BTU (th) to Gigajoule Converter

Energy Converter

27 units available

Decimals:

From

To

1.054350e-6

1 BTU = 1.054350e-6 GJ

Formula:

GJ = BTU × 0.0000010544

With your value: 1 BTU = 1.054350e-6 GJ

How big is that?

Everyday references on a logarithmic scale, all expressed in btu (th) so you can sanity-check the result.

Heartbeat (1/1.1e+3 your value)0.000948 BTU

Your value1.00 BTU

AA battery charge (9.5× your value)9.48 BTU

Slice of bread (2.7e+2× your value)266 BTU

Daily food intake (8.0e+3× your value)7.97e+3 BTU

Litre of petrol (3.2e+4× your value)3.24e+4 BTU

Other BTU (th) to Gigajoule conversions

2 BTU to GJ 3 BTU to GJ 4 BTU to GJ 5 BTU to GJ 6 BTU to GJ 7 BTU to GJ 8 BTU to GJ

BTU (th) to Gigajoule Conversion Table

BTU (th) (BTU)	Gigajoule (GJ)
0.5	5.271750e-7
1	1.054350e-6
2	2.108700e-6
5	5.271750e-6
10	1.054350e-5
15	1.581525e-5
20	2.108700e-5
25	2.635875e-5
50	5.271750e-5
100	0.000105
250	0.000264
500	0.000527
1000	0.001054

Gigajoule to BTU (th) Conversion Table

Gigajoule (GJ)	BTU (th) (BTU)
0.5	474,225.826339
1	948,451.652677
2	1,896,903.305354
5	4,742,258.263385
10	9,484,516.52677
15	14,226,774.790155
20	18,969,033.05354
25	23,711,291.316925
50	47,422,582.63385
100	94,845,165.267701
250	237,112,913.169251
500	474,225,826.338502
1000	948,451,652.677005

Where these values come from

Every factor on this page is traced to the document that defines it. See the full provenance dataset or our methodology.

BTU (th) (BTU)

Energy

Exact conversion

The International Table BTU is exactly 1055.055 852 62 J.

Thermochemical and 39 °F BTU definitions differ by up to 0.2 %.

Source: NIST Special Publication 811, Guide for the Use of the International System of Units

National Institute of Standards and Technology (US) · Reviewed 2026-07-01

Gigajoule (GJ)

Energy

Exact conversion

Derived from the joule (1 J = 1 kg·m²/s²). Thermochemical and IT calories, BTU and kWh are exact defined multiples.

Source: NIST Special Publication 811, Guide for the Use of the International System of Units

National Institute of Standards and Technology (US) · Reviewed 2026-07-01

How to Convert BTU (th) to Gigajoule

To convert from BTU (th) (BTU) to Gigajoule (GJ), multiply the value by 1.054350e-6.

Formula: GJ = BTU × 0.0000010544

Reverse: BTU = GJ × 948,451.6526770049

Step-by-Step Example

Start with your value in BTU (th). For example: 5 BTU
Multiply by the conversion factor: 5 x 1.054350e-6
The result is: 5.271750e-6 GJ

About BTU (th)

The btu (th) (BTU) is a unit of energy and work. One btu (th) equals 1054.35 joules. UnitConvertLab converts it against every other energy unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.

Common uses: energy calculations, engineering and science, education.

About Gigajoule

The gigajoule (GJ) is a unit of energy and work. One gigajoule equals 1.000000 × 10^+9 joules. UnitConvertLab converts it against every other energy unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.

Common uses: energy calculations, engineering and science, education.

Frequently Asked Questions

How many Gigajoule are in 1 BTU (th)?

There are exactly 1.054350e-6 Gigajoule in 1 BTU (th). This means the conversion factor from BTU (th) to Gigajoule is 1.054350e-6.

What is the formula to convert BTU (th) to Gigajoule?

The formula to convert BTU (th) to Gigajoule is: GJ = BTU × 0.0000010544. For example, to convert 10 BTU (th) to Gigajoule, you would multiply 10 by 1.054350e-6.

What is a BTU (th)?