550 Gallon Underground Oil Tank dimensions
Usually filled to ~500 gal. A 48 in diameter variant also exists — confirm your diameter before using this chart.
| Spec | Value |
|---|---|
| Diameter | 42 in |
| Length | 92 in (7.7 ft) |
| Geometric capacity | 551.8 gal |
| Nominal rating | 550 gal |
| Liquid weight (brim-full) | 3,973 lb of heating oil #2 |
| Empty tank weight | Varies by gauge/manufacturer — see nameplate or spec sheet |
Placement notes
Indoor oil tank clearances are governed by NFPA 31 and local code; requirements differ by jurisdiction and tank listing, so confirm specifics with your installer or AHJ. Practically, leave working access to the gauge, fill and vent, keep the legs on a solid level pad (a square footage calculator helps size the slab and figure concrete), and maintain the code-required separation from the burner.
Source
42 x 92 in variant per supplier gauge charts. Geometry yields 551 gal.. Capacity figures are computed from this geometry with exact partial-fill math — see methodology.
FAQ
What are the dimensions of a 550 gallon underground oil tank?
42″ × 92″ (7.7 ft) — full table above. Source: 42 x 92 in variant per supplier gauge charts. Geometry yields 551 gal..
How much does a full 550 gallon underground oil tank weigh?
About 3,973 lb of heating oil #2 brim-full, plus the empty tank weight.
How accurate are these figures?
Dimensions come from the sources listed; capacity is computed from exact geometry and matches our chart pages. Usually filled to ~500 gal. A 48 in diameter variant also exists — confirm your diameter before using this chart.