How the figure 8 pool volume calculator works
Each lobe is treated as an ellipse: 3.1416 times half its length times half its width. Add both lobe areas together.
Multiply the combined area by the average water depth. One lobe is often deeper, so average across the whole pool.
The formula
Volume = (ellipse 1 area + ellipse 2 area) x average depth
Measure: Length and width of both lobes, average depth.
Worked example
A 16 by 14 foot lobe is 175.9 square feet and a 14 by 12 foot lobe is 131.9 square feet, giving 307.8 square feet.
At an average depth of 4.5 feet that is 1,385 cubic feet, roughly 10,362 gallons or 39,220 litres.
Tips before you measure
Split the pool at the narrowest point of the waist so neither lobe is measured twice.
If one lobe is a deep hopper, work out both lobes separately at their own depths for a tighter number.
Figure-8 pool volume FAQs
Where do the two lobes split?
At the pinch point in the middle, where the pool is at its narrowest.
Why not measure it as one oval?
The waist removes water that an oval formula counts, so a single oval reading runs high.
Are both lobes usually the same size?
Rarely. Most figure 8 pools have a larger deep lobe and a smaller shallow one.
Other pool shapes
Not quite the right outline? The main pool volume calculator covers all 20 shapes with the same units and formulas.