Pool Water Weight Calculator
Safety first: Calculate the total load a pool exerts on your deck, patio, or foundation. Water is incredibly heavy; find out exactly how much.
Is My Deck Strong Enough?
Standard household decks are built to hold **40 to 60 lbs per square foot (PSF)**. A pool with just 3 feet of water exerts about **187 PSF**. This is why you should **never** put an above-ground pool on a standard deck without structural reinforcement.
Pro Tip: Before filling, make sure you know how long it will take to reach your target depth. Use our Pool Fill Time Calculator to plan your schedule.
Frequently Asked Questions
Can I put a small inflatable pool on my balcony?
It is very risky. Even a small 'kiddie' pool with only 12 inches of water exerts about 62 lbs per square foot, which exceeds the structural capacity of many apartment balconies.
Does salt water weigh more than fresh water?
Yes, but only slightly (about 2-3%). For residential pool calculations, the standard 8.34 lbs per gallon is accurate enough for safety assessments.
Foundation & Prep
The ground beneath your pool must be compacted and level. If the weight is unevenly distributed, the pool wall can buckle, leading to a catastrophic failure that releases thousands of gallons of water in seconds.
Pro Tip: Use a layer of sand or a specialized pool pad under above-ground pools to protect the liner from rocks and roots that can be pushed through by the massive pressure.