Frequently Asked Questions
How many gallons in a 36x18x18 aquarium?
36 x 18 x 18 = 11,664 cu in / 1728 = 6.75 cu ft x 7.481 = 50.5 gallons.
How many gallons in a 24-inch diameter by 48-inch tall vertical tank?
pi x (12)^2 x 48 / 1728 = 12.57 cu ft x 7.481 = 94.0 gallons.
How do I find the volume of a horizontal cylindrical tank?
Use the same formula as vertical but swap height for length: pi x (D/2)^2 x length / 1728 cu in per cu ft, then x 7.481 for gallons.
What is 1 cubic foot in gallons?
1 cubic foot = 7.481 US gallons. 1 gallon = 0.1337 cubic feet.
How many gallons in a 48x24x24 inch tank?
Rectangular: 48 x 24 x 24 = 27,648 cubic inches / 1728 = 16 cu ft x 7.481 = 119.7 gallons.
How many gallons in a 500-gallon propane tank?
Most residential propane tanks are horizontal cylinders. A standard 500-gallon tank measures about 10 ft long and 37.5 in diameter. Propane tanks are filled to 80% capacity for thermal expansion: 500 x 0.80 = 400 gallons maximum working capacity.
What is the volume of a 55-gallon drum?
A standard 55-gallon drum is about 23 in diameter and 34.5 in tall. Volume = pi x (11.5)^2 x 34.5 / 1728 = 8.30 cu ft x 7.481 = 62.1 gallons - a bit over the nominal 55-gallon size, since drums are typically filled a few inches below the rim.
How do I measure an irregular tank?
For tanks that do not match the standard shapes, measure the widest and tallest cross-sections. If roughly oval, use the oval formula. For very irregular shapes, fill the tank with a known volume of water to measure capacity directly.
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This calculator provides estimates for informational purposes only. Results are based on assumptions and may not reflect actual outcomes. Consult qualified professionals in relevant fields before making important decisions based on these results.