How to Measure a Pool: A Comprehensive Guide

Understanding how to measure a pool is a fundamental skill for any pool owner. Whether you’re calculating the volume of water needed, planning for a pool cover, or simply curious about your pool’s size, accurate measurements are essential. In this blog post, we will guide you through the process of measuring different types of pools and calculating their volume. Rest assured, you don’t have to be a math whiz to get this done. With a few simple steps and our handy tips, you’ll be able to measure your pool like a pro in no time!


Identifying Your Pool’s Shape

Swimming pools come in a myriad of shapes, and the first step towards calculating your pool’s surface area is identifying its shape. From traditional rectangular and circular designs to more complex shapes like kidney or oval, your pool’s shape will determine the formula you need to use for the calculations.

Determining Necessary Measurements

Different pool shapes will require different measurements. For instance, if you have a circular pool, the diameter (distance from the edge of the pool through the center to the opposite edge) is all you need. However, for rectangular or square pools, you’ll need to measure both the length and the width. Once you’ve identified your pool’s shape, make a note of the measurements you’ll need to take.

Taking Pool Measurements

Now comes the hands-on part: measuring your pool. Using a tape measure, record the necessary dimensions in feet. For length, lay the tape measure parallel to one side of the pool and record the measurement. For width, start at one corner of the pool and measure the distance to the opposite corner. Be sure to write down both measurements to ensure accuracy.

Calculating the Surface Area

Once you have your measurements, it’s time to do the math. If you have a rectangular pool, simply multiply the length by the width to get the surface area. For round pools, multiply the diameter by itself (to get the radius squared), then multiply the result by 3.14 (pi). This will give you your pool’s surface area. Remember, there are also online pool surface area calculators available to assist with these calculations.

Estimating Pool Depth for Volume Calculation

Although not directly related to calculating the surface area, knowing your pool’s depth is crucial for estimating its volume, which is especially handy when determining how much water your pool holds. To measure the depth, submerge the tape measure into the pool until it reaches the bottom, noting the measurement at the top of the pool wall. If your pool depth varies, measure both the shallowest and the deepest points, then find the average depth by adding the two measurements together and dividing by two.


Mastering how to calculate your pool’s surface area is an essential skill for any pool owner. It not only enables you to determine the correct heat pump size but also helps in other pool maintenance tasks. Remember, precision is key, so take your time and double-check your measurements. Armed with this knowledge, you’re well on your way to becoming a pool measurement expert!