GUIDE深度 · Deep dive
How to Calculate Pool Volume
Pool volume in gallons equals cubic feet times 7.48. For a rectangular pool, multiply length by width by average depth; for a sloping floor, average the shallow and deep ends.
Rectangular pool
Length times width times average depth in feet times 7.48 gives gallons; average depth = (shallow + deep) / 2.
For 20 by 10 by 5 feet: 1,000 cubic feet, about 7,480 gallons.
Round and freeform
Round: pi times radius squared times average depth times 7.48. For freeform, split the pool into rectangles and circles and add them.
Volume drives chlorine dosing, pump turnover and heating time, so an error affects water quality.
FAQ
How many gallons is 20 by 10 by 5 feet?
1,000 cubic feet times 7.48 is about 7,480 gallons.
How do I handle a sloping floor?
Average the shallow and deep ends; for complex shapes, split into sections and add.