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Tank Volume Calculator

Volume of tanks and containers

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.

  1. 1Cylindrical: V = π × r² × h
  2. 2Rectangular: V = L × W × H
  3. 3Oval (elliptical): V = π × a × b × h (a,b = semi-axes)
  4. 4Conical: V = (1/3) × π × r² × h
  5. 51 cubic foot = 7.481 US gallons = 28.317 liters
Tank typeTypical sizeVolume
Residential water heater40–80 gallon151–302 L
Residential propane120–1000 gallon454–3,785 L
Septic tank (family)1,000–1,500 gallon3,785–5,678 L
Swimming pool (avg)10,000–20,000 gal37,854–75,708 L
Oil barrel42 US gallons159 L
Fuel tanker truck5,000–11,000 gal18,927–41,639 L

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.

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