Volume
gal (UK)toac·ft
Convert imperial gallons (gal (UK)) to acre-feet (ac·ft).
Factor1 gal (UK) = 3.685575e-6 ac·ft
Converter
gal (UK)
Accepts numbers or expressions, e.g. 150 + 14.7
Result
ac·ft
Rendered to 6 significant figures.
Formula
Formula
ac·ft = gal (UK) × 3.685575e-6
Multiply any value in imperial gallons by 3.685575e-6 to obtain the value in acre-feet.
Worked example
Convert 100000 gal (UK) to ac·ft.
- 01Start with 100000 gal (UK).
- 02Multiply by the conversion factor: 100000 × 3.685575e-6 = 0.368558 ac·ft.
Result100000 gal (UK) = 0.368558 ac·ft
Conversion table
| gal (UK) | ac·ft |
|---|---|
| 1 | 3.6856e-6 |
| 2 | 7.3712e-6 |
| 5 | 1.8428e-5 |
| 10 | 3.6856e-5 |
| 20 | 7.3712e-5 |
| 50 | 0.00018428 |
| 100 | 0.00036856 |
| 200 | 0.00073712 |
| 500 | 0.0018428 |
| 1000 | 0.0036856 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from gal (UK) to ac·ft?
1 gal (UK) equals 3.685575e-6 ac·ft. To convert, multiply the value in imperial gallons by 3.685575e-6.
How do I convert 1 gal (UK) to ac·ft?
1 gal (UK) = 3.68558e-6 ac·ft. For any value, multiply by 3.685575e-6.
How do I convert ac·ft back to gal (UK)?
Divide by the same factor — or equivalently, multiply by 271328.1. So 1 ac·ft = 271328 gal (UK).
When would I need to convert imperial gallon to acre-foot?
Volume conversions are used for tank sizing, batch calculations, and bridging between vendor specs (gallons, barrels, ft³) and process documentation (m³, litres).
Is the conversion exact?
The factor shown is precise to at least 7 significant figures. For most process-engineering work this is far better than instrument accuracy. For metrology or trade applications, refer to the relevant national standard (NIST, BIPM, ISO 80000).