Kiddie Pool Weight Calculator

The weight of a filled kiddie pool depends on its size and water volume. Water weighs approximately 8.34 pounds per gallon (1 kg per liter).

• Small kiddie pools (50 gallons): ~420 pounds (190 kg)
• Medium kiddie pools (150 gallons): ~1,250 pounds (570 kg)
• Large kiddie pools (300+ gallons): 2,500+ pounds (1,130+ kg)

These weights include only the water. The pool structure itself adds minimal weight for inflatable pools (5-15 pounds) but can add significant weight for framed pools (25-100+ pounds).

Most residential decks are designed to support 40-50 pounds per square foot (psf). To determine if your deck can support a kiddie pool:

1. Calculate the pool's total weight (water + structure)
2. Divide by the pool's footprint area in square feet to get pounds per square foot
3. Compare to your deck's load capacity

For example, a 6-foot round pool with 150 gallons (~1,250 pounds) spread over 28 square feet equals about 45 psf, which is near the limit for many decks.

For larger pools or older decks, consult a structural engineer. Ground-level decks and concrete patios generally provide better support than elevated decks.

A healthy lawn can typically support the weight of most kiddie pools, but the weight distribution is important. For best results:

• Choose a flat area to ensure even weight distribution
• Remove any sharp objects that could damage the pool
• Consider using a ground cloth or interlocking foam tiles under the pool to protect both the lawn and pool
• For pools over 300 gallons, consider using a rigid platform or pavers to distribute weight more evenly

While grass can handle the weight, extended periods under a pool (more than a few days) may damage or kill the grass underneath due to lack of sunlight and air circulation.

Most apartment balconies are NOT safe for kiddie pools due to weight limitations. Typical residential balconies are designed to support 40-60 pounds per square foot, which is quickly exceeded by even small kiddie pools.

For example, a tiny 30-gallon pool weighs about 250 pounds, and if placed on a 4x6 foot area, creates a load of approximately 10 psf from water alone. However, the weight is concentrated rather than evenly distributed, creating potential structural concerns.

Additionally, many apartment leases and HOA regulations prohibit pools on balconies due to water damage risks. If you're considering a very small wading pool (under 10 gallons), always check your lease agreement and consult with property management first.