Convert 15 impgal to gal
15 imperial gallons = 18.014249 US gallons
Sumwise · Maintained by Theo Abbott (pen name) · automated checks · Data: exact arithmetic; unit definitions from NIST SP 811 · Updated · How the checks work
How to convert imperial gallons to US gallons
- Formula:
US gallons = imperial gallons × 1.20095 - Put in the value: 15 imperial gallons.
- Result: 18.014249 US gallons.
Imperial gallons to US gallons table
| imperial gallons | US gallons |
|---|---|
| 1 impgal | 1.20095 gal |
| 2 impgal | 2.4019 gal |
| 5 impgal | 6.00475 gal |
| 10 impgal | 12.009499 gal |
| 15 impgal | 18.014249 gal |
| 20 impgal | 24.018999 gal |
| 50 impgal | 60.047496 gal |
| 100 impgal | 120.094993 gal |
| 500 impgal | 600.474963 gal |
| 1,000 impgal | 1,200.95 gal |
Converting the other way: US gallons to imperial gallons
imperial gallons = US gallons × 0.83267418. So 18.014249 US gallons is back to 15 imperial gallons; one US gallon is 0.83267418 imperial gallons. See the US gallons to imperial gallons table.
Quick estimate in your head
For a rough answer, multiply by about 1.2: 15 × 1.2 ≈ 18 gal, against the exact 18.014249 gal (0.1% out). Good enough to check that a calculated result is sensible.
Common mistakes
The usual slip is using the factor the wrong way round. A imperial gallon is bigger than a US gallon, so the number of US gallons must come out larger than the number of imperial gallons. If your answer goes the other way, divide instead of multiplying.
About the units
Imperial gallon (impgal) and US gallon (gal) are both units of volume. One imperial gallon equals 1.20095 US gallons, and one US gallon equals 0.83267418 imperial gallons. Results on this page are rounded for display; the conversion itself uses the exact definitions.
Volume conversions come up in recipes, fuel economy, drink and bottle sizes, garden and pool water, and engine sizes.
15 imperial gallons in other units
The most readable unit for this amount is imperial gallons (15).
- 68,191.35 ml
- 68.19135 l
- 0.06819135 m3
- 13,834.94 tsp
- 4,611.65 tbsp
- 2,305.82 floz
- 288.227982 cup
- 144.113991 pt
- 72.056996 qt
- 18.014249 gal
How answers are calculated and checked: methodology.
Questions
How many US gallons are in 15 imperial gallons?
18.014249 US gallons.
What is the formula to convert imperial gallons to US gallons?
US gallons = imperial gallons × 1.20095
How many US gallons are in one imperial gallon?
One imperial gallon is 1.20095 US gallons, so multiply any number of imperial gallons by 1.20095.
Is 15 impgal more than 15 gal?
Yes. 15 imperial gallons is 18.014249 US gallons, which is more than 15 US gallons.
How do I convert imperial gallons to US gallons in a spreadsheet?
Put the number of imperial gallons in A1 and type =A1*1.20095 in the next cell. Fill the formula down to convert a whole column.