1000 gallon underground oil tank chart
The 1000 gallon underground tank shows up on larger properties and two-family homes. It has the same 48 inch diameter as a 550, stretched to about 130 inches long, so a stick reads the same depth scale in both. Each wet inch here carries nearly twice the oil. Be sure which tank you have before you read gallons off the chart.
Type a reading, or drag the level ↕
| Inches | Gallons | Inches | Gallons |
|---|---|---|---|
| 1″ | 5 | 25″ | 536 |
| 2″ | 15 | 26″ | 563 |
| 3″ | 27 | 27″ | 590 |
| 4″ | 41 | 28″ | 617 |
| 5″ | 56 | 29″ | 643 |
| 6″ | 73 | 30″ | 670 |
| 7″ | 92 | 31″ | 696 |
| 8″ | 112 | 32″ | 721 |
| 9″ | 132 | 33″ | 746 |
| 10″ | 154 | 34″ | 771 |
| 11″ | 176 | 35″ | 796 |
| 12″ | 199 | 36″ | 819 |
| 13″ | 223 | 37″ | 842 |
| 14″ | 247 | 38″ | 865 |
| 15″ | 272 | 39″ | 886 |
| 16″ | 297 | 40″ | 907 |
| 17″ | 323 | 41″ | 926 |
| 18″ | 349 | 42″ | 945 |
| 19″ | 375 | 43″ | 962 |
| 20″ | 402 | 44″ | 978 |
| 21″ | 428 | 45″ | 992 |
| 22″ | 455 | 46″ | 1004 |
| 23″ | 482 | 47″ | 1013 |
| 24″ | 509 | 48″ | 1018 |
Tap any row to send that reading to the gauge above.
Generated 2026-09-20. Computed from nominal tank geometry at 231 cubic inches per gallon. Actual tanks vary by manufacturer; cross-check your tank data plate.
Preview the printable sheet
Reading the numbers
- Full computes to about 1018 gallons. Half is 24 inches, 509 gallons.
- A quarter (about 255 gallons) sits near 14.5 inches. Even at a quarter, this tank holds nearly as much as a full 275.
- The middle band moves about 27 gallons per inch, nearly double the 550's 15. A half inch of stick error is about 13 gallons here, so keep the stick vertical and read carefully.
- A 30 inch wet line is 670 gallons here. The same reading on a 550 is 371 gallons, since both tanks are 48 inches deep but nowhere near the same length. Settle the tank ID before you order oil against a reading.
- Read it through the fill pipe with a long stick, wet line only. The procedure and the water-finding paste check are in how to stick an oil tank.
Common questions
How can I tell a 1000 from a 550?
Not with the stick: both tanks are 48 inches deep, and the length difference (about 130 inches against 72) is buried. Look for installation records or the original permit, or ask your oil company. One hard clue from delivery history: a single delivery larger than about 560 gallons cannot fit in a 550. What size is my oil tank has more.
Who actually has a 1000 gallon tank?
Larger single homes, two-family houses, and properties that were converted from small commercial use. The draw of the size is fewer deliveries: one tank can carry a long stretch of the heating season between fills.
How many gallons per inch?
About 27 through the middle band, far less in the first and last few inches where the round shell curves away. Always convert with the chart; straight multiplication on a cylinder goes wrong fast near the top and bottom.
Is the reading procedure different from a smaller buried tank?
No, it is the same fill-pipe technique: a 6 to 8 foot clean wooden stick, lowered gently to the bottom, wet line only, cap back on firmly. See the buried-tank section of how to stick an oil tank, including the water-finding paste check.
Related
- 550 gallon underground chart (same depth scale, half the oil)
- How to stick an oil tank (buried-tank procedure)
- What size is my oil tank?
- How long will my oil last?
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