How many gallons of water in 20x40 lazy L pool?

To calculate the volume of a 20x40 lazy L pool, you'll first need the average depth. Assuming an average depth of 5 feet, the formula for volume in gallons is: length × width × average depth × 7.48 (gallons per cubic foot). Therefore, for a 20x40 pool with a 5-foot average depth, the volume would be approximately 29,976 gallons (20 × 40 × 5 × 7.48). Adjust the depth accordingly for a more accurate estimate.