If you have a more complicated shaped pool, you’ll need to run a few other calculations. But the rounding isn’t enough to throw off your water chemistry calculations. Note: The calculator rounds up decimal points, which makes it easier to calculate chemical dosing.
You want to know how much water is in your pool, and it’s probably not filled up to the top. Be sure to measure from the depth of your water, not the height of the wall or the depth of the pool.