Measuring a pool for a cover is the single most important step in ensuring a secure, functional, and long-lasting installation. A precise measurement translates to less winter maintenance, reduced water evaporation, and protection against debris. Whether you are preparing for the colder months or looking to keep your pool clean during the peak season, taking the time to get this right saves significant time, money, and frustration later on.
Understanding the Two Primary Measurement Types
Before you pull out a tape measure, it is essential to distinguish between two fundamental cover types: custom and standard. The measurement method diverges significantly based on this choice. A custom cover is fabricated specifically for your pool’s unique dimensions, requiring detailed specific measurements. Conversely, a standard or generic cover is designed to fit a range of common pool sizes, meaning you are looking for the closest possible match rather than a perfect fit. Choosing the type dictates the precision required for your measurements.
How to Measure a Pool for a Custom Cover
For a custom cover, accuracy is non-negotiable. You will need a durable tape measure, a notepad, and a helper to ensure the tape stays taut and straight across the water’s surface. Because the cover is built to your exact specifications, you must record the dimensions of the pool’s surface area, not the deck or coping.
Measuring Rectangular and Square Pools
For rectangular or square pools, measure the length and width of the water surface itself. Take multiple measurements across the width and length to account for any slight variations caused by settling or construction. Record the longest dimension for the length and the widest dimension for the width. Do not measure the surrounding deck or the coping; the cover lays on the water’s edge.
Measuring Round and Oval Pools
Round pools require measuring the diameter—the widest distance across the circle—at least twice to confirm consistency. For oval pools, you need both the maximum length and the maximum width, just as you would for an ellipse. Ensure the tape measure passes through the very center of the structure to get an accurate representation of the surface area that needs to be covered.
How to Measure for a Standard or One-Size-Fits-All Cover
If you are opting for a standard cover, your goal is to find the closest available size rather than an exact match. These covers are typically categorized by common dimensions such as 16x32 or 18x36. The process involves measuring your pool to identify which standard size bracket your pool falls into, usually allowing for a few inches of overlap or gap.
Using the Tape Measure Correctly
Regardless of the pool shape, keep the tape measure level and tight. For larger pools, it is advisable to lock the tape or use a helper to hold it steady to prevent sagging, which would result in a false, shorter measurement. Measure to the nearest inch to ensure you select the correct standard size or provide accurate data for a custom order. Always write the measurements down immediately to avoid forgetting critical dimensions.
Accounting for Shape and Obstacles
Not all pools are simple geometric shapes. If your pool features a combination of styles, such as a rectangular section with a semicircular end, break the structure down into smaller, measurable shapes. Calculate the dimensions of each section separately and then combine them logically. Furthermore, measure around ladders, return jets, or skimmer openings to determine if you need to order a custom cut or if the standard size provides enough flexibility to accommodate these features.
Final Verification and Ordering
Once the measurements are taken, double-check the numbers for accuracy. Compare your final figures against the manufacturer's size chart if you are purchasing a standard cover. For custom covers, review the specifications one last time before placing the order. Taking a moment to verify that you have recorded the longest points and the correct shape ensures the cover will install smoothly and function as intended for years to come.
