Calculate pool water weight, gallons, liters, surface loading, and fill time from rectangular, round, oval, or known-volume pool measurements.

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Pool Water Weight Formula

The following example problem outlines the steps and information needed to estimate the weight of the water in a pool. This uses an approximate value for fresh water of about 8.34 lb per US gallon (it varies slightly with temperature and dissolved salts).

W₍water)(lb) = V(US gal) × 8.34 (lb) / (US gal)

Variables:

  • Wwater is the estimated weight of the pool water (lb)
  • V is the total pool volume (US gallons)

To estimate pool water weight (fresh water), multiply the volume of the pool in US gallons by 8.34.

How to Calculate Pool Water Weight?

The following steps outline how to calculate the pool water weight.

  1. First, determine the total volume of water in the pool (US gallons).
  2. Next, use the formula from above: Wwater = V × 8.34.
  3. Finally, calculate the water weight.
  4. After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

total volume of the pool (gallons) = 500

Wwater = V × 8.34 = 500 × 8.34 = 4,170 lb (approx.)