Stock tank sizes, dimensions & gallons
Galvanized round, round-end and poly stock tanks from Behlen Country, Tarter and Rubbermaid Commercial — the manufacturers' own dimensions and capacities, plus the gallons each inch of depth holds.
Round tank of a size not listed here? The vertical tank volume calculator gives gallons at any water depth.
10 ft round stock tank
The largest standard galvanized tank. Behlen Country's model 50130188 (sold as 10×2) is 120 in across and 23.5 in high, rated 1,117 gallons. Brim-full, that geometry holds 1,151 gal; each inch of depth is worth about 49 gallons. Full, the water alone weighs about 9,321 lb — put it on level, compacted ground, not on a slope where one side carries the load.
Tarter's largest round galvanized tank is 8 ft (WTR82, 700 gal); in poly, Tarter's DuraTough range goes to a 1,300-gallon 10 ft round.
Round-end (oval) galvanized tanks
Sold as height × width × length in feet: a “2×2×8” is 2 ft high, 2 ft wide and 8 ft long. The ends are half-circles, so the footprint is a rectangle plus one full circle of the tank's width.
| Maker / model | Dimensions (L × W × H) | Maker's capacity | Geometry, brim-full | Per inch of depth |
|---|---|---|---|---|
| Behlen Country 50130018 · 2×2×3 | 37.5 × 25.5 × 23.5 in | 71 gal | 83 gal | 3.5 gal |
| Behlen Country 50130028 · 2×2×4 | 46.5 × 26.5 × 23.5 in | 103 gal | 110 gal | 4.7 gal |
| Behlen Country 50130038 · 2×2×5 | 58.75 × 23.75 × 23.5 in | 134 gal | 130 gal | 5.5 gal |
| Behlen Country 50130048 · 2×2×6 | 70.25 × 26.5 × 23.5 in | 169 gal | 174 gal | 7.4 gal |
| Behlen Country 50130058 · 2×2×8 | 94.25 × 26 × 23.5 in | 224 gal | 235 gal | 10.0 gal |
| Behlen Country 50130088 · 3×2×8 | 93 × 36 × 23.5 in | 294 gal | 312 gal | 13.3 gal |
| Tarter WT223 · Oval Dura Tall 70 | 36 × 24 × 24 in | 70 gal | 77 gal | 3.2 gal |
| Tarter WT224 · Oval Ultra 100 | 48 × 24 × 24 in | 100 gal | 107 gal | 4.5 gal |
| Tarter WT225 · Oval Ultra 125 | 60 × 24 × 24 in | 125 gal | 137 gal | 5.7 gal |
| Tarter WT226 · Oval Ultra 170 | 72 × 24 × 24 in | 170 gal | 167 gal | 6.9 gal |
| Tarter WT228 · Oval Mega 220 | 96 × 24 × 24 in | 220 gal | 227 gal | 9.4 gal |
Tarter's catalog lists the WT328 “Oval Mega 300” at 96 × 24 × 24 in — the same as the 220-gallon WT228. A 24-inch-wide tank that size holds about 230 gallons, so the printed width looks like a catalog error (300 gallons needs about 36 in, as on Behlen's 3×2×8). It is left out of the table until Tarter corrects it.
| Maker / model | Dimensions (L × W × H) | Maker's capacity | Geometry, brim-full | Per inch of depth |
|---|---|---|---|---|
| Tarter WT214 · Oval Versa 40 | 48 × 24 × 12 in | 40 gal | 53 gal | 4.5 gal |
| Tarter WT216 · Oval Dura 70 | 72 × 24 × 12 in | 70 gal | 83 gal | 6.9 gal |
Round galvanized tanks
| Maker / model | Dimensions | Maker's capacity | Geometry, brim-full | Per inch of depth |
|---|---|---|---|---|
| Behlen Country 50130118 · 3×2 | 36 in dia × 24 in | 85 gal | 106 gal | 4.4 gal |
| Tarter WTR32 · Round Ultra 105 | 36 in dia × 24 in | 105 gal | 106 gal | 4.4 gal |
| Behlen Country 50130128 · 4×2 | 47 in dia × 24 in | 165 gal | 180 gal | 7.5 gal |
| Tarter WTR42 · Round Ultra 165 | 48 in dia × 24 in | 165 gal | 188 gal | 7.8 gal |
| Behlen Country 50130148 · 6×2 | 69 in dia × 23.5 in | 389 gal | 380 gal | 16.2 gal |
| Tarter WTR62 · Round Mega 390 | 72 in dia × 24 in | 390 gal | 423 gal | 17.6 gal |
| Behlen Country 50130168 · 8×2 | 96 in dia × 23.5 in | 706 gal | 736 gal | 31.3 gal |
| Tarter WTR82 · Round Mega 700 | 96 in dia × 24 in | 700 gal | 752 gal | 31.3 gal |
| Behlen Country 50130188 · 10×2 | 120 in dia × 23.5 in | 1,117 gal | 1,151 gal | 49.0 gal |
Poly stock tanks
Poly tanks have sloped sides and moulded ribs, so these are overall product dimensions, not a clean geometric shape — use the maker's capacity rather than computing from them.
| Maker / model | Product L × W × H | Maker's capacity |
|---|---|---|
| Rubbermaid Commercial FG424300BLA · BRUTE 50 gal | 52 × 31 × 12 in | 50 gal |
| Rubbermaid Commercial FG424288BLA · BRUTE 100 gal | 53 × 31 × 25 in | 100 gal |
| Rubbermaid Commercial 2226155 · BRUTE 120 gal low profile | 73.5 × 39 × 14 in | 120 gal |
| Rubbermaid Commercial FG424500BLA · BRUTE 150 gal | 58 × 39 × 24.5 in | 150 gal |
| Rubbermaid Commercial FG424700BLA · BRUTE 300 gal | 63 × 69 × 25 in | 300 gal |
| Behlen Country 52120605 · rigid poly 60 gal | 53 × 31.5 × 15 in | 60 gal |
| Behlen Country 52121005 · rigid poly 100 gal | 52.75 × 31.5 × 25 in | 100 gal |
| Behlen Country 52121505 · rigid poly 150 gal | 56.5 × 41.75 × 25 in | 150 gal |
| Behlen Country 52123005 · rigid poly 300 gal | 81 × 46.5 × 25.5 in | 300 gal |
How these figures are worked out
gal = 0.0034 × D² × H (inches)gal = (π × W² ÷ 4 + W × (L − W)) × H ÷ 231A US gallon is exactly 231 cubic inches. The “geometry” column applies these to the maker's stated dimensions, brim-full. The maker's own figure is usually lower because of the corrugated wall, rolled rim and drain fitting; where it is slightly higher (Behlen's 2×2×5 and 6×2, Tarter's WT226), the published dimensions are rounded. Behlen ships tanks nested inside each other, so the B and C tanks of a nested set are slightly smaller — the figures here are for the largest (A) version.
FAQ
How many gallons is a 10 ft stock tank?
Behlen Country's 10 ft galvanized round tank (model 50130188, 120 in diameter × 23.5 in high) is rated 1,117 gallons. Each inch of depth holds about 49 gallons, and full it carries roughly 9.3 thousand lb (4.7 tons) of water.
What size is a 2×2×8 stock tank?
The trade name is height × width × length in feet. Behlen's 2×2×8 round-end tank is 94.25 in long, 26 in wide and 23.5 in high and holds 224 gallons; Tarter's equivalent (WT228) is 96 × 24 × 24 in and 220 gallons.
What does 3×2×8 or 2×3×8 mean?
The same tank written two ways: 3 ft wide, 2 ft high, 8 ft long. Behlen lists its 3×2×8 at 93 × 36 × 23.5 in and 294 gallons.
How many gallons per inch is my stock tank?
Footprint area in square inches ÷ 231. For a round tank that is 0.0034 × diameter²; for a round-end tank it is (0.785 × W² + W × (L − W)) ÷ 231. Stock tanks have vertical sides, so every inch of depth holds the same amount — see the per-inch column above.
Why is the maker's capacity different from the geometry?
The geometry is brim-full at the stated dimensions. Corrugated walls, the rolled rim and the drain boss take volume out, so the maker's figure is usually 3–15 % lower. A few come out slightly higher, which means the published dimension is rounded. Use the maker's figure for ordering and the per-inch figure for reading a level.
Sources and standards
- Farmstead Oval Stock Tanks — Tank SizingBehlen Country (manufacturer)https://www.behlencountry.com/products/farmstead-oval-stock-tanksModel numbers, capacity and height/length/width for the galvanized round-end range (version A of each nested set). Behlen notes that actual dimensions and capacities may vary from nominal.
- Farmstead Round Stock Tanks — Tank SizingBehlen Country (manufacturer)https://www.behlencountry.com/products/farmstead-round-stock-tanksGalvanized round tanks from 3 ft to 10 ft (model 50130188, 10×2, 1,117 gal, 120 in diameter, 23.5 in high).
- Rigid Poly Stock TanksBehlen Country (manufacturer)https://www.behlencountry.com/products/rigid-poly-stock-tanksCapacities and dimensions appear on the product page after selecting a size.
- Tarter Catalog No. 9 — Stock Tanks (catalog pp. 113–118)Tarter (manufacturer)https://tarter.canto.com/direct/document/9nimaeavg126pdgfjmf8rjn768/dpuV1ohvkSbd9mZcc4HTuK2NhWE/original?content-type=application%2Fpdf&name=Tarter_Catalog_No9.pdfItem numbers, height, length/diameter, width and approximate capacity for Tarter's galvanized range.
- BRUTE Stock Tanks — product specificationsRubbermaid Commercial Products (manufacturer)https://www.rubbermaidcommercial.com/material-handling/farm-garden/brute-stock-tanks/Product length, width, height and weight by SKU.
- Handbook 44, Appendix C — General Tables of Units of MeasurementNational Institute of Standards and Technology, U.S. Department of Commercehttps://www.nist.gov/document/2026-nist-handbook-44-appendix-c
Every linked source above was retrieved and checked on 2026-11-01.