Find the water surface area of a swimming pool in square feet, square metres and square yards from its shape and inside dimensions. Enter the values shown in the calculator to get a practical planning estimate.
Free interactive calculatorPool Volume
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FREE ONLINE CALCULATOR
Pool Surface Area Calculator
Enter the inside dimensions of the pool at the waterline. The area is shown when you calculate.
AREA
YOUR ESTIMATE
Estimated pool surface area
Planning estimate
Pool surface area—Square feet
Square metres—Water surface
Square yards—Water surface
Waterline length—Perimeter
Floor + wall area—Approximate interior surface
Measurement note: This is an estimate for the water surface of a regular shape. Steps, benches, curves and cut-out corners can change the real area. Use inside waterline dimensions, and measure the deck or surrounding area separately.
ABOUT THIS TOOL
What this calculator helps with
Pool Volume
A pool surface area calculator estimates the size of the water surface of a swimming pool from its shape and inside dimensions. Instead of working it out by hand, you enter a length and width or a diameter, and the pool surface area calculator returns the area in square feet, square metres and square yards.
Why this calculation matters
Surface area is the starting point for choosing a pool cover, estimating evaporation and heat loss, and comparing pool sizes. It is also the figure people want from a pool square footage calculator: the area of the water surface, which is different from the pool's volume in gallons or the size of the surrounding deck.
Details to have ready
Pool shape, such as rectangular, round, oval or freeform.
Inside length and width, or inside diameter, measured at the waterline.
The unit you measure in, feet or metres, kept the same for every dimension.
Optional average water depth if you also want an estimate of the floor and wall area.
How to prepare
Identify the pool shape closest to yours and choose it in the calculator.
Measure the inside length and width, or the inside diameter, at the waterline.
Choose feet or metres and enter every dimension in that unit.
Add an average depth only if you need the approximate floor and wall area as well.
Note: Steps, benches, curves and cut-out corners change the true area. For an irregular pool, split the shape into simple sections or treat the result as an estimate. This page is about swimming pools, not billiards or pool tables.
MEASUREMENT & CALCULATION GUIDE
How to calculate swimming pool surface area
The surface area of a pool is the area of its water surface, measured at the waterline. This swimming pool surface area calculator uses the inside dimensions of the pool and the formula for its shape, then converts the result into square feet, square metres and square yards. People often search for the same figure as pool square footage, square feet of a pool or pool area.
Rectangular: length × width = surface area Round: π × radius² = surface area Oval: π ÷ 4 × length × width = surface area
Pool surface area examples
A 30 ft by 15 ft rectangular pool has a surface area of 30 × 15 = 450 square feet. A 24 ft round pool has an area of π × 12² ≈ 452.4 square feet. A 30 ft by 15 ft oval pool is smaller, at about 353.4 square feet, because the curved ends remove area compared with a rectangle of the same length and width.
Pool square footage calculator: what is included?
A pool square footage calculator normally reports the water surface only. It does not include the deck, coping or landscaping around the pool. If you enter an average water depth, this tool also gives an approximate floor and wall area (surface area plus waterline length × average depth), which is a rough guide for liner or finish planning on a pool with a level floor.
Where surface area is used
Choosing the size of a solar cover, safety cover or winter cover, which usually needs extra allowance beyond the water surface.
Understanding evaporation and heat loss, which increase with a larger water surface. See the pool heater size calculator for a heat-up estimate.
Getting the area before working out volume. Multiply by average depth, or use the pool volume calculator.
Comparing pool sizes or checking a quoted dimension against what you measured. The guide to measuring a pool explains how to take the measurements.
COMMON QUESTIONS
About Pool Surface Area Calculator
How do I calculate the surface area of a swimming pool?
Multiply length by width for a rectangular pool, use π × radius² for a round pool, and π ÷ 4 × length × width for an oval pool. Measure the inside dimensions at the waterline.
Is pool surface area the same as pool square footage?
Usually people mean the area of the water surface, which is what this tool calculates. It does not include the deck or coping around the pool, so measure those separately if you need them.
What is the difference between surface area and pool volume?
Surface area is a flat area in square feet or square metres. Volume also uses the average depth and is given in gallons or litres, so use the pool volume calculator when you need capacity.
How do I find the surface area of a freeform pool?
The calculator approximates a freeform pool as an oval using its longest length and widest width. Curves, lobes and built-in features can make the real area differ, so treat the result as an estimate.
Does the swimming pool surface area calculator include the pool floor and walls?
The main result is the water surface only. If you enter an average depth, the tool also shows an approximate floor and wall area, which can help when planning a liner or surface finish.
Which measurements should I use?
Use inside dimensions at the waterline rather than the outside wall or coping, because outside measurements include wall thickness and overstate the water area.
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