You are watching: How to measure a swimming pool

It is crucial to understand the volume that a swimming swimming pool to make precise chemistry adjustments. Even veteran pool specialists can eyeball a pool and also estimate the volume that it...but just how accurately? us have discovered through surveying many of our customers approximately the country, that swimming pool volume estimations–without measuring–are often off by more than 2000-3000 gallons (7571 - 11,356 L). ~ above average, that"s about a 10% error. Ten percent!

That can mean 10% much more chemicals provided (assuming you measure up chemicals correctly in the very first place), or it could mean under-dosing the swimming pool every visit. No are an excellent outcomes, and also will result in water chemistry challenges.

Some pools room fortunate enough to have a specific volume on record (based on the pool builder"s style software). However many pools room not therefore fortunate. Because that those pools, we have to estimate their volume by measure up dimensions and also doing part calculations. There are number of pool volume calculators available online, and our totally free Orenda app has a*Pool Volume Estimator *feature that supplies the formula provided in the NSPF"s Certified swimming pool Operator (CPO) cultivate manual.

**HELPFUL IDEA:**Want help measuring? You deserve to use a laser measuring tool. Collection up a bucket or check kit ~ above the opposite next of the pool, and aim the laser in ~ it. This is a fast and easy means to measure up dimensions that your pool accurately. Because that depth, use your brush/net/vacuum pole, however without an attachments on it. Make note on the pole exactly how deep the water come up ~ above the pole, then measure it when you pull it the end of the water.

## Swimming swimming pool Volume Calculations

Pool volume is calculated based on length, width, and also average depths. Basically we room trying to number out the cubic area the the whole swimming pool, climate multiply by a provided volume the water per the cubic unit of measurement. Below are the multipliers, depending upon the devices of measurement friend use.

*1 Cubic Foot = 7.48 gallons / 28.31 L*

*1 Cubic Meter = 264.17 gallons / 1,000 L*

The infographic over (which we spent method too much time creating ourselves) offers you the basics for those common shapes that pools. Obviously, free kind pools that space not conveniently kidney-shaped are an ext difficult.

### Rectangular Pools and also Multi-Rectangular Pools

*(Length) x (Width) x (Average Depth) x (7.48) = swimming pool Volume in Gallons*

**Average depth** requires–at a minimum–measuring the deepest depth and the shallowest, and finding the typical of the two. However some pools have actually mostly shallow and also a steep autumn off right into a little deep area, or vice versa. In instances like that, it can be useful to take an ext than two depth dimensions to obtain a more accurate average depth measurement.

A normal rectangular pool is reasonably straightforward to calculate volume. Multi-shaped pools, however, have to be calculation by splitting the pool into sections, then adding them together. Because that instance, one L shape pool must be divided into 2 rectangles, then include the 2 volumes the water together.

### Circular Pools and also Spas

*(Surface Area) x (Average Depth) x (7.48) = Pool/Spa Volume in Gallons*

If you understand the diameter or radius the the circle, you have the right to calculate the area v the assist of Pi (π). The formula is πR2, or <3.14 x (Radius squared)>. ~ you understand the area, every you require is to understand the median depth. Spas space usually pretty easy. Measure up the depth the the bench, and the depth the the floor. The typical depth is <(floor depth + bench depth)÷2>. Then just multiply the cubic area by the volume variable (7.48 because that gallons). Over ground pools are also easier, since they only have actually one depth throughout.

### Free kind / Oblong / Kidney-shaped Pools

*(Length) x (Approximate Width) x (Average Depth) x (7.48) = pool Volume in Gallons*

Free form pools are more and more popular these days. Unfortunately they are likewise more complicated to measure up the volume on. If you have actually a free-form pool, call the swimming pool builder, and hope they conserved the volume that the pool from the design software they used. Otherwise, you"re walk to need to do the finest you have the right to with dimensions you can measure.

The general idea is to shot to obtain the area as accurately as possible, then multiply by average depth, and again through the volume factor (7.48 for gallons). To acquire area on a kidney shaped pool, measure up diameters throughout each that the main round areas. Include them together and also find the typical diameter, i beg your pardon will role as your **approximate width**. In the diagram here, A and also B stand for two diameters throughout the pool.

*<(A + B)÷2> = median Diameter = approximate Width*

Then merely multiply the "width" by the size to find your area. Take her area, multiply by average depth and the volume factor, and also you have actually an approximate pool volume.

Alternatively, if you have actually the time and the patience, there is a chemical means to measure pool volume within a very little margin that error. It entails diluted water samples and also alkalinity testing.

## The Orenda App

If you currently use the Orenda App, you know we have a*Pool Volume Estimator* built into it. We continue to update and also improve upon it, therefore it will certainly look different as we continue to improve it. But the formulas perform not change. Right now we offer volume estimations for Rectangular, Circular and Oblong/Kidney swimming pool shapes.

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Whatever method you use to calculate pool volume, that is essential to perform so. No measuring pool volume is among the most common bad habits we check out that reason problems and also wasted money.