330 gallon vertical oil tank chart
The 330 vertical is the tall oval that measures 27″ wide, 44″ tall and a full 72″ long. Plenty of basements hold one without the owner knowing, because from the end it looks identical to the shorter oval that shares its 27 by 44 inch face. Stick it through the fill or gauge opening, read the wet line, and convert below.
Type a reading, or drag the level ↕
| Inches | Gallons | Inches | Gallons |
|---|---|---|---|
| 1″ | 2 | 23″ | 173 |
| 2″ | 6 | 24″ | 182 |
| 3″ | 11 | 25″ | 190 |
| 4″ | 17 | 26″ | 199 |
| 5″ | 23 | 27″ | 207 |
| 6″ | 30 | 28″ | 216 |
| 7″ | 38 | 29″ | 225 |
| 8″ | 45 | 30″ | 233 |
| 9″ | 53 | 31″ | 242 |
| 10″ | 61 | 32″ | 250 |
| 11″ | 70 | 33″ | 259 |
| 12″ | 78 | 34″ | 267 |
| 13″ | 87 | 35″ | 275 |
| 14″ | 95 | 36″ | 283 |
| 15″ | 104 | 37″ | 291 |
| 16″ | 113 | 38″ | 298 |
| 17″ | 121 | 39″ | 305 |
| 18″ | 130 | 40″ | 312 |
| 19″ | 138 | 41″ | 318 |
| 20″ | 147 | 42″ | 322 |
| 21″ | 156 | 43″ | 326 |
| 22″ | 164 | 44″ | 329 |
Tap any row to send that reading to the gauge above.
Generated 2026-07-27. Computed from nominal tank geometry at 231 cubic inches per gallon, with a 2.2 percent dished-head allowance calibrated to the manufacturer’s published capacity chart. Matches the chart books oil dealers use within about a gallon.
Reading the numbers
- Full is about 329 gallons. A normal fill stops a few inches short of the top anyway.
- Half is 22 inches, 164 gallons. A quarter (about 82 gallons) sits near 13 inches, a sensible reorder point once the weather turns.
- The middle of the tank moves about 8.6 gallons per inch. The extra foot of length over a shorter oval shows up in every inch.
- At 10 inches you are down to about 61 gallons. In a cold snap that is days of heat, not weeks.
- Identify the tank before you trust the chart. If your tank measures 72 inches end to end, this is your chart. Looking for a different size? See the 275 gallon oil tank chart.
Common questions
How do I know my tank is a 330 and not a smaller oval?
You cannot tell from the end, because the common upright ovals share the same 27 inch by 44 inch face. Measure the length instead: 60 inches is a 275, 72 inches is a 330. The data plate on the tank end settles it, if the stamping is still readable.
What happens if I read this tank with the wrong chart?
Every reading comes out about 20 percent low. At 20 inches a chart for the 60 inch oval says about 123 gallons, while this tank actually holds about 147 at the same depth. A wrong-chart reading is a common reason the run-out math never adds up.
Why is full 329 instead of 330?
About 329 gallons is what the tank geometry computes to with its dished heads; the 330 label rounds up the last gallon. A real fill lands lower, because the delivery whistle stops the fill below the top to leave an air gap.
When should I reorder?
In winter, do not ride below a quarter tank: about 82 gallons, around 13 inches on the stick. That leaves room for a delivery to be a few days out. See when to order heating oil.
Related
- 330 gallon horizontal chart (same tank lying flat)
- All tank charts by size
- What size is my oil tank?
- How to stick an oil tank
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