Tank Capacity and Diameter

How do I use this chart? To determine the number of gallons of fuel remaining in your tank, measure the depth of the fuel in the tank, then compare that measurement (in inches) to the chart below.

What do I use to measure the fuel? Many hardware stores and home centers sell measuring sticks specifically for this purpose. Some homeowners have also used weighted strings or measuring tapes to measure the fuel.

How do I determine my tank size? 550 and 1,000 gallon tanks are generally underground tanks. 275 and 330 gallon tanks are both above-ground tanks. Approximate dimensions of a 275 gallon tank is 26″ X 44″ X 5 ft long. A 330 gallon tank is 1 foot longer than a 275.

How much will may tank actually hold? Your tank, when full, will actually contain less fuel than it’s full capacity. For example, in a 275 gallon tank, the actual “usable” capacity is about 250 -256 gallons. The difference is the “head space” that is designed into the tank to allow for fuel expansion and for safe filling at the time of delivery.

CAPACITY 275-Horiz. 275-Vert. 330 550 1000 1080 CAPACITY
DIAMETER (Height) 26″ 42″ 44.5 48″ 48″ 47″ DIAMETER (Height)
INCHES OF FUEL INCHES OF FUEL
1 6 2 3 3 5 8 1
2 14 5 6 8 14 19 2
3 23 9 11 14 26 32 3
4 33 14 17 22 40 47 4
5 43 20 23 30 55 64 5
6 54 26 30 40 72 83 6
7 65 32 37 50 90 103 7
8 77 39 44 61 110 124 8
9 89 46 52 72 130 145 9
10 100 53 60 84 151 169 10
11 113 60 68 96 173 193 11
12 125 67 77 109 196 219 12
13 137 75 85 122 220 244 13
14 149 82 93 136 244 271 14
15 161 90 102 149 269 298 15
16 174 97 110 163 294 327 16
17 185 105 119 177 319 357 17
18 197 112 127 192 345 386 18
19 209 120 136 206 371 415 19
20 221 127 144 221 397 444 20
21 231 135 152 236 424 473 21
22 241 142 161 250 451 502 22
23 251 150 169 265 477 534 23
24 260 157 178 280 504 561 24
25 268 165 186 295 531 591 25
26 275 172 194 310 558 620 26
27 * 180 203 325 584 649 27
28 * 187 211 339 611 678 28
29 * 195 220 354 637 707 29
30 * 203 228 369 663 736 30
31 * 210 237 383 689 764 31
32 * 217 245 397 715 793 32
33 * 224 253 411 740 820 33
34 * 231 262 424 764 848 34
35 * 238 270 438 789 875 35
36 * 244 278 451 812 901 36
37 * 250 285 464 835 926 37
38 * 256 292 476 857 951 38
39 * 261 299 488 879 973 39
40 * 265 306 500 899 994 40
41 * 268 311 510 918 1014 41
42 * 271 317 519 935 1033 42
43 * 320 530 954 1050 43
44 * * 325 538 969 1065 44
45 * * * 546 983 1078 45
46 * * * 552 994 1089 46
47 * * * 558 1004 1095 47
48 * * * 560 1007 * 48

Note: Tank dimensions may vary from manufacturer to manufacturer so gallons listed should be viewed as approximate.