Convert imperial gallons to US gallons in one step. Results update live in both directions, with a worked formula, nearby units and a 1–100 chart you can click.
imp gal
gal
Step-by-step calculation
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How to use the UK Gallons to US Gallons Converter
Type a value in the Imperial gallons box. The gallons (US) result appears instantly.
Going the other way? Type in the Gallons (US) box, or press the ⇄ swap button.
Set the precision with the decimal places menu.
Check the working in the step-by-step box, then press Copy result or click any row in the tables below.
Imperial gallons to gallons (US) formula
gal = imp gal × 1.200949926
Take the value in imperial gallons.
Multiply it by 1.200949926 (the number of US gallons in one imperial gallon).
Example: 1 imp gal × 1.200949926 = 1.20095 gal.
Reverse formula (US gallons to imperial gallons): imp gal = gal ÷ 1.200949926. Example: 12.0095 gal ÷ 1.200949926 = 10 imp gal.
Quick mental estimate: multiply by about 1.2. For exact answers use the converter above.
imp gal to gal conversion table (1–100)
Click any row to load it into the converter.
Imperial gallons to gallons (US)
Imperial gallons
Gallons (US)
1 imp gal
1.2 gal
2 imp gal
2.4 gal
3 imp gal
3.6 gal
4 imp gal
4.8 gal
5 imp gal
6 gal
6 imp gal
7.21 gal
7 imp gal
8.41 gal
8 imp gal
9.61 gal
9 imp gal
10.81 gal
10 imp gal
12.01 gal
11 imp gal
13.21 gal
12 imp gal
14.41 gal
13 imp gal
15.61 gal
14 imp gal
16.81 gal
15 imp gal
18.01 gal
16 imp gal
19.22 gal
17 imp gal
20.42 gal
18 imp gal
21.62 gal
19 imp gal
22.82 gal
20 imp gal
24.02 gal
21 imp gal
25.22 gal
22 imp gal
26.42 gal
23 imp gal
27.62 gal
24 imp gal
28.82 gal
25 imp gal
30.02 gal
26 imp gal
31.22 gal
27 imp gal
32.43 gal
28 imp gal
33.63 gal
29 imp gal
34.83 gal
30 imp gal
36.03 gal
31 imp gal
37.23 gal
32 imp gal
38.43 gal
33 imp gal
39.63 gal
34 imp gal
40.83 gal
35 imp gal
42.03 gal
36 imp gal
43.23 gal
37 imp gal
44.44 gal
38 imp gal
45.64 gal
39 imp gal
46.84 gal
40 imp gal
48.04 gal
41 imp gal
49.24 gal
42 imp gal
50.44 gal
43 imp gal
51.64 gal
44 imp gal
52.84 gal
45 imp gal
54.04 gal
46 imp gal
55.24 gal
47 imp gal
56.44 gal
48 imp gal
57.65 gal
49 imp gal
58.85 gal
50 imp gal
60.05 gal
51 imp gal
61.25 gal
52 imp gal
62.45 gal
53 imp gal
63.65 gal
54 imp gal
64.85 gal
55 imp gal
66.05 gal
56 imp gal
67.25 gal
57 imp gal
68.45 gal
58 imp gal
69.66 gal
59 imp gal
70.86 gal
60 imp gal
72.06 gal
61 imp gal
73.26 gal
62 imp gal
74.46 gal
63 imp gal
75.66 gal
64 imp gal
76.86 gal
65 imp gal
78.06 gal
66 imp gal
79.26 gal
67 imp gal
80.46 gal
68 imp gal
81.66 gal
69 imp gal
82.87 gal
70 imp gal
84.07 gal
71 imp gal
85.27 gal
72 imp gal
86.47 gal
73 imp gal
87.67 gal
74 imp gal
88.87 gal
75 imp gal
90.07 gal
76 imp gal
91.27 gal
77 imp gal
92.47 gal
78 imp gal
93.67 gal
79 imp gal
94.88 gal
80 imp gal
96.08 gal
81 imp gal
97.28 gal
82 imp gal
98.48 gal
83 imp gal
99.68 gal
84 imp gal
100.88 gal
85 imp gal
102.08 gal
86 imp gal
103.28 gal
87 imp gal
104.48 gal
88 imp gal
105.68 gal
89 imp gal
106.88 gal
90 imp gal
108.09 gal
91 imp gal
109.29 gal
92 imp gal
110.49 gal
93 imp gal
111.69 gal
94 imp gal
112.89 gal
95 imp gal
114.09 gal
96 imp gal
115.29 gal
97 imp gal
116.49 gal
98 imp gal
117.69 gal
99 imp gal
118.89 gal
100 imp gal
120.09 gal
Gallons (US) to imperial gallons
Gallons (US)
Imperial gallons
1 gal
0.83 imp gal
2 gal
1.67 imp gal
3 gal
2.5 imp gal
4 gal
3.33 imp gal
5 gal
4.16 imp gal
6 gal
5 imp gal
7 gal
5.83 imp gal
8 gal
6.66 imp gal
9 gal
7.49 imp gal
10 gal
8.33 imp gal
11 gal
9.16 imp gal
12 gal
9.99 imp gal
13 gal
10.82 imp gal
14 gal
11.66 imp gal
15 gal
12.49 imp gal
16 gal
13.32 imp gal
17 gal
14.16 imp gal
18 gal
14.99 imp gal
19 gal
15.82 imp gal
20 gal
16.65 imp gal
21 gal
17.49 imp gal
22 gal
18.32 imp gal
23 gal
19.15 imp gal
24 gal
19.98 imp gal
25 gal
20.82 imp gal
26 gal
21.65 imp gal
27 gal
22.48 imp gal
28 gal
23.31 imp gal
29 gal
24.15 imp gal
30 gal
24.98 imp gal
31 gal
25.81 imp gal
32 gal
26.65 imp gal
33 gal
27.48 imp gal
34 gal
28.31 imp gal
35 gal
29.14 imp gal
36 gal
29.98 imp gal
37 gal
30.81 imp gal
38 gal
31.64 imp gal
39 gal
32.47 imp gal
40 gal
33.31 imp gal
41 gal
34.14 imp gal
42 gal
34.97 imp gal
43 gal
35.8 imp gal
44 gal
36.64 imp gal
45 gal
37.47 imp gal
46 gal
38.3 imp gal
47 gal
39.14 imp gal
48 gal
39.97 imp gal
49 gal
40.8 imp gal
50 gal
41.63 imp gal
51 gal
42.47 imp gal
52 gal
43.3 imp gal
53 gal
44.13 imp gal
54 gal
44.96 imp gal
55 gal
45.8 imp gal
56 gal
46.63 imp gal
57 gal
47.46 imp gal
58 gal
48.3 imp gal
59 gal
49.13 imp gal
60 gal
49.96 imp gal
61 gal
50.79 imp gal
62 gal
51.63 imp gal
63 gal
52.46 imp gal
64 gal
53.29 imp gal
65 gal
54.12 imp gal
66 gal
54.96 imp gal
67 gal
55.79 imp gal
68 gal
56.62 imp gal
69 gal
57.45 imp gal
70 gal
58.29 imp gal
71 gal
59.12 imp gal
72 gal
59.95 imp gal
73 gal
60.79 imp gal
74 gal
61.62 imp gal
75 gal
62.45 imp gal
76 gal
63.28 imp gal
77 gal
64.12 imp gal
78 gal
64.95 imp gal
79 gal
65.78 imp gal
80 gal
66.61 imp gal
81 gal
67.45 imp gal
82 gal
68.28 imp gal
83 gal
69.11 imp gal
84 gal
69.94 imp gal
85 gal
70.78 imp gal
86 gal
71.61 imp gal
87 gal
72.44 imp gal
88 gal
73.28 imp gal
89 gal
74.11 imp gal
90 gal
74.94 imp gal
91 gal
75.77 imp gal
92 gal
76.61 imp gal
93 gal
77.44 imp gal
94 gal
78.27 imp gal
95 gal
79.1 imp gal
96 gal
79.94 imp gal
97 gal
80.77 imp gal
98 gal
81.6 imp gal
99 gal
82.43 imp gal
100 gal
83.27 imp gal
Common values
Imperial gallons
Gallons (US)
Example
0.5 imp gal
0.6 gal
Half gallon
1 imp gal
1.2 gal
1 imperial gallon
2 imp gal
2.4 gal
2 gallons
5 imp gal
6 gal
5 gallons
10 imp gal
12.01 gal
10 gallons
12 imp gal
14.41 gal
Car fuel tank (approx.)
20 imp gal
24.02 gal
20 gallons
50 imp gal
60.05 gal
50 gallons
About imperial gallons and gallons (US)
Imperial gallons (imp gal). The UK imperial gallon is exactly 4.54609 liters, about 20% larger than the US gallon (3.785 L). It is used in the UK for fuel economy (mpg) and in some Commonwealth countries.
Gallons (US) (gal). The US liquid gallon is exactly 231 cubic inches, about 3.785 liters. The UK imperial gallon is larger, about 4.546 liters.
Frequently asked questions
What is 1 imperial gallon in US gallons?
One imperial gallon equals 1.20095 US gallons. These are US customary measures.
How do you convert imperial gallons to US gallons?
Multiply the number of imperial gallons by 1.200949926. For example, 1 imp gal × 1.200949926 = 1.20095 gal.
What is 10 imperial gallons in US gallons?
10 imp gal is 12.0095 gal.
How much is 20 imperial gallons in US gallons?
20 imperial gallons equals 24.019 US gallons.
How do I convert US gallons back to imperial gallons?
Divide by 1.200949926, or press the ⇄ swap button above. For example, 12.0095 gal ÷ 1.200949926 = 10 imp gal.
Why are UK and US gallons different?
The US kept the old English wine gallon of 231 cubic inches (3.785 L), while Britain redefined its gallon in 1824 as 10 pounds of water, 4.54609 L. One imperial gallon is about 1.2 US gallons.
Are US and UK gallons the same?
No. The US liquid gallon is 3.785 liters, while the UK imperial gallon is 4.546 liters, about 20% larger. US quarts and pints are smaller than imperial ones for the same reason. This converter uses US liquid measures.