High school mathematics will help you calculate the number of gallons a round tank holds. Just use a simple formula based on the tank's depth and radius. Measure the inside dimensions to calculate the capacity most accurately.
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Things you need
- Measuring tape
Calculate the radius of the tank. The radius equals the tank's diameter divided by two. (The diameter is the distance from a point on one side of the tank to the point directly opposite.) That means if the diameter is 22 feet, the radius is 11 feet (because 22 divided by 2 equals 11). Convert any partial foot to a decimal. For example, a diameter of 17 feet has a radius of 8.5 feet.
Multiply the radius by itself to obtain its square. (For example, if the radius is 11 feet, multiply it by 11 to get 121.)
Multiply 3.1417 (pi) by the radius' square. For example, 3.1417 times 121 equals 380.146.
Measure the depth. Convert any partial foot to a decimal. Depending on the tank's size, you might need a ladder to stand on.
Multiply the result in Step 3 by the depth of the tank to convert the measurements and calculate the tank's capacity in cubic feet. (For example, 380.146 multiplied by a depth of 10 feet gives you 3801.46 cubic feet.)
Multiply the result in Step 5 by 7.47. This converts the measurement into gallons. For example, 3801.46 times 7.47 gives you 28,397 gallons (rounded off). This is the water capacity in gallons of a 22-foot-by-10-foot-round tank.
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