British Thermal Unit to Gigajoule Converter
Energy · unit-converter
Convert British Thermal Unit to Gigajoule with fixed input and output units, a step-by-step formula line, and reference tables. Factors are joule-based; food energy uses thermochemical calories. The full Energy Converter also includes MMBtu, toe, thermal kWh, and MeV/GeV.
Calculator
From: British Thermal Unit (btu)
To: Gigajoule (gj)
About British Thermal Unit
The British thermal unit used here is the IT BTU: ≈ 1,055.056 J. It appears in HVAC, heating equipment, and US engineering data.
About Gigajoule
One gigajoule is 1,000,000,000 J. Utility-scale and fuel-system reporting commonly use GJ.
How to convert british thermal units to gigajoules
1 british thermal unit is equal to 0.00000105505585 gigajoule when both are expressed in joule-equivalents:
1 btu = (1,055.05585262 J ÷ 1,000,000,000 J) gj = 0.00000105505585 gj
Each british thermal unit is defined as 1,055.05585262 J and each gigajoule as 1,000,000,000 J in this tool, so one btu equals 1,055.05585262 ÷ 1,000,000,000 gj = 0.00000105505585 gj.
Let d(btu) be the numeric amount in British Thermal Unit (btu), and d(gj) the amount in Gigajoule (gj). Then:
d(gj) = d(btu) × (1,055.05585262 / 1,000,000,000)
Equivalently, divide by how many btu fit into one gj (joules per gj divided by joules per btu):
d(gj) = d(btu) ÷ 947817.12031331716571
Or: gigajoule = british thermal unit ÷ 947817.12031331716571
Examples
Example #1: Convert 1 btu to gigajoule
1 btu = 1 btu × (1,055.05585262/1,000,000,000) gj = 0.0000010551 gj
1 btu = 1 btu ÷ 947817.12031331716571 = 0.0000010551 gj
Example #2: Convert 10 btu to gigajoule
10 btu = 10 btu × (1,055.05585262/1,000,000,000) gj = 0.0000105506 gj
10 btu = 10 btu ÷ 947817.12031331716571 = 0.0000105506 gj
Summary
To convert British Thermal Unit to Gigajoule, multiply the value in btu by the ratio of joules per btu divided by joules per gj. Equivalently: value_gj = value_btu × (1055.05585262 / 1000000000). Numerically, 1 btu equals 0.00000105505585262 gj.
Relationship context
You are converting between US / imperial engineering units (BTU, therm, ft·lb) (British Thermal Units) and SI energy (joules) (Gigajoules). All values are mapped through joules first. The numeric factor is 1.055056e-6.
Conversion tables
| British Thermal Unit (btu) | Gigajoule (gj) |
|---|---|
| 0.1 | 0.0000001055 |
| 1 | 0.0000010551 |
| 2 | 0.0000021101 |
| 3 | 0.0000031652 |
| 4 | 0.0000042202 |
| 5 | 0.0000052753 |
| 6 | 0.0000063303 |
| 7 | 0.0000073854 |
| 8 | 0.0000084404 |
| 9 | 0.0000094955 |
| British Thermal Unit (btu) | Gigajoule (gj) |
|---|---|
| 10 | 0.0000105506 |
| 20 | 0.0000211011 |
| 30 | 0.0000316517 |
| 40 | 0.0000422022 |
| 50 | 0.0000527528 |
| 60 | 0.0000633034 |
| 70 | 0.0000738539 |
| 80 | 0.0000844045 |
| 90 | 0.000094955 |
| 100 | 0.0001055056 |