Tank Volume Calculator
A tank volume calculator finds the volume of cylindrical, rectangular, oval, or conical tanks. Volume determines storage capacity for water, fuel, chemicals, or septic systems. Results are given in gallons, liters, and cubic feet.
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Tip: For partially filled tanks: multiply total volume by the fill fraction. A cylindrical tank 70% full: V_filled = 0.70 × π × r² × h. For accurate measurement of a lying horizontal cylinder, the formula is more complex — use a tank strapping chart.
- 1Cylindrical: V = π × r² × h
- 2Rectangular: V = L × W × H
- 3Oval (elliptical): V = π × a × b × h (a,b = semi-axes)
- 4Conical: V = (1/3) × π × r² × h
- 51 cubic foot = 7.481 US gallons = 28.317 liters
| Tank type | Typical size | Volume |
|---|---|---|
| Residential water heater | 40–80 gallon | 151–302 L |
| Residential propane | 120–1000 gallon | 454–3,785 L |
| Septic tank (family) | 1,000–1,500 gallon | 3,785–5,678 L |
| Swimming pool (avg) | 10,000–20,000 gal | 37,854–75,708 L |
| Oil barrel | 42 US gallons | 159 L |
| Fuel tanker truck | 5,000–11,000 gal | 18,927–41,639 L |
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Fun Fact
The world's largest oil storage tank (Juaymah, Saudi Arabia) holds 160 million barrels of crude oil — enough to supply the entire world's daily oil consumption for more than 1.5 days.
References
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