How many gallons of water are in a 16x32 inground pool?

Pool & SpaPool Water Chemistry

Swimming Pool Water Volume Calculator

Calculate total swimming pool water capacity in gallons and determine exact chlorine shock dosages based on pool dimensions and shape.

Pool & Spa Field StandardsPool Water Chemistry

Engineering formulations calibrated to IPC, UPC & NEC specificationsSub-Zero Cold Climate Tolerances

Quick Summary & Key Answer

To calculate rectangular pool volume: multiply Length × Width × Average Depth × 7.48. For example, a 16' × 32' pool with an average depth of 5.75 feet holds approximately 22,000 gallons of water, requiring 2.2 lbs of chlorine shock per treatment.

Water weighs 8.34 lbs per gallon; a 20,000 gallon pool weighs over 166,000 lbs.
Pool pumps should circulate the entire water volume once every 8 to 12 hours.
1 lb of 68% calcium hypochlorite shock treats 10,000 gallons of water.

Interactive Calculator

Adjust inputs for real-time results

Pool Shape

Length (or Diameter if Round)feet

feet

Width (if Rectangular or Oval)feet

feet

Shallow End Depthfeet

feet

Deep End Depthfeet

feet

Calculated OutputPool Volume Sized

Total Pool Water Capacity

22,021 GalUS Gallons

Average Pool Depth: 5.8 Feet
Total Water Weight: 183,656 lbs (91.8 tons)
Chlorine Shock Dose Needed: 2.2 lbs (Calcium Hypo)
Turnover Flow Rate (8-hr cycle): 46 GPM

Note: 1 Cubic Foot = 7.48 Gallons. Maintain water turnover by sizing the pool filter pump for at least one full volume cycle every 8 hours.

Pool Pump Sizing Guidelines

Size pool pump GPM to turn over 100% of pool water volume within 8 hours to maintain chemical sanitation.

Frequently Asked Questions

Common questions regarding this calculation and code compliance

A standard 16x32 inground pool with a shallow and deep end holds approximately 18,000 to 22,000 gallons of water.