100 gallon tank: dimensions that work
100 gal = 379 L = 13.4 ft³. Full weight ≈ 835 lb of water. Below: every diameter/length pair that holds exactly this — geometry, not brand specs, so you can sanity-check any manufacturer sheet.
| Diameter | Length |
|---|---|
| 24 in dia | 51 in (4.3 ft) |
| 30 in dia | 33 in (2.7 ft) |
| Diameter | Height |
|---|---|
| 24 in dia | 51 in tall |
| 30 in dia | 33 in tall |
Have a real tank with these dimensions? Generate its inch-by-inch dip chart, or run partial fills on the universal calculator. Manufactured tanks add heads, legs and fittings — treat these tables as the geometric core and trust the nameplate where one exists.
FAQ
How big is a 100 gallon tank?
It depends on the proportions — the tables above show every horizontal length and vertical height that holds exactly 100 gallons at common diameters. Pure geometry: πr²L = 100 × 231 in³.
How much does 100 gallons weigh?
About 835 lb as water or 705 lb as diesel — grade ranges and more liquids on the weight library.
How many litres is 100 gallons?
379 litres (0.4 m³). Exact: 1 US gal = 3.785411784 L.