How to Measure for a New Pool Liner

A pool liner must fit your pool’s shape and size exactly to prevent wrinkles, leaks, or stretching. Taking accurate measurements saves time, money, and frustration during installation.

Problems from Incorrect Measurements

• Loose or wrinkled liner

• Leaks from poor sealing

• Wasted money on an unusable liner

• Longer installation time

Tools and Supplies You Will Need

Having the right tools makes measuring more precise and efficient.

Essential Tools

• 100-foot measuring tape

• Chalk or marker

• Notepad and pen

• Helper for holding tape

• Level (optional for checking slopes)

Optional Items

• String line for straight reference points

• Camera for recording details

Step-by-Step Guide to Measuring Your Pool

Follow these steps to ensure you get the right measurements for your new liner.

Step 1: Measure the Length and Width

• For rectangular pools, measure the inside length and width at the waterline.

• For oval or round pools, measure the diameter at the widest point.

• Record each measurement clearly.

Step 2: Measure the Depth

• Measure the shallow end depth from the floor to the coping.

• Measure the deep end depth in the same way.

• Note if your pool has a gradual slope or a sudden drop.

Step 3: Identify the Pool Shape

• Take note of the pool’s shape: rectangular, oval, round, kidney, or freeform.

• For irregular shapes, it helps to draw a rough sketch and mark all dimensions.

Step 4: Check the Corners

• Determine if corners are square, diagonal, or rounded.

• Measure the radius of rounded corners by extending a tape from the corner point to where the curve begins.

Step 5: Measure Slopes and Breaks

• Measure where the floor starts sloping from shallow to deep.

• Note the length of flat areas and the incline distance.

• Use a level or helper to ensure accurate slope measurements.

Advanced Tips for Precision

Double-Check Your Work

• Measure each section twice to confirm accuracy.

• Have your helper read back the numbers while you write them down.

Mark Key Points

• Use chalk or markers to indicate points like the slope break, corners, and deepest point.

• Take photos of these points for reference.

Contact a Professional for Complex Shapes

• If your pool has unusual curves or angles, consider hiring a professional to measure.

• Some liner companies offer free measuring services to ensure a perfect fit.

Common Mistakes to Avoid

• Measuring outside the pool walls instead of inside

• Guessing depths without a tape measure

• Forgetting to record the slope or floor transitions

• Ignoring corner shapes or radii

Safety Tips While Measuring

• Use caution around the pool edge, especially if wet.

• Have a helper to hold the tape and provide support.

• Avoid leaning too far over the pool when measuring deep areas.

Helpful Notes

• Keep all notes and sketches organized for when you order your liner.

• If in doubt, consult the liner manufacturer’s guidelines for measuring.

• A precise fit ensures a professional look and extends the life of your liner.

By following this guide and taking careful measurements, you can confidently order the right pool liner and enjoy a smooth, hassle-free installation.