120 Gallon Propane Tank dimensions
Maximum fill is 80% of water capacity (~96 gal propane). Gauge reads % of capacity.
| Spec | Value |
|---|---|
| Diameter | 24 in |
| Shell (cylinder) length | 56 in |
| Overall length incl. heads | ~64 in (5.3 ft) |
| Geometric capacity | 120 gal |
| Nominal rating | 120 gal water capacity |
| Liquid weight (at the 80% legal fill) | 407 lb of liquid propane |
| Empty tank weight | Varies by gauge/manufacturer — see nameplate or spec sheet |
Clearance rules (NFPA 58)
Above-ground propane vessels of 125–500 gallons water capacity must sit at least 10 feet from buildings and property lines; 1,000–2,000 gallon vessels need 25 feet (reducible to 10 ft only in a specific single-tank case). Containers under 125 gallons may sit adjacent to a building, but still need 5 feet from building openings and 10 feet from ignition sources. Underground tanks up to 2,000 gallons need 10 feet from buildings and property lines. These are the NFPA 58 national baselines per the Propane Education & Research Council — many states and municipalities are stricter, so confirm locally before siting a tank.
Source
Nominal 24 in dia ASME vessel; cylinder length solved so geometric capacity = nameplate water capacity.. Capacity figures are computed from this geometry with exact partial-fill math — see methodology.
FAQ
What are the dimensions of a 120 gallon propane tank?
24″ × 56″ × ~64″ (5.3 ft) — full table above. Source: Nominal 24 in dia ASME vessel; cylinder length solved so geometric capacity = nameplate water capacity..
How much does a full 120 gallon propane tank weigh?
About 407 lb of liquid propane at the 80% legal fill, 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. Maximum fill is 80% of water capacity (~96 gal propane). Gauge reads % of capacity.