poolchemistrycalc

16 × 36 ft pool volume

A 16 × 36 ft pool holds

23,700gal 89,700L

At an average water depth of 66 in.

Section through a 16 × 36 ft pool: 66 in of water at its average depth, and the 23,700 gal figure computed from the water. 16 ft × 36 ft 66 in of water gallons use this

Gallons at every fill

Gallons at each average depth of water.
Average depth Holds
48 in 17,200 gal
65,100 L
54 in 19,400 gal
73,400 L
60 in 21,500 gal
81,400 L
66 in
this page		 23,700 gal
89,700 L
At 23,700 gal

What to add

One product for each adjustment, worked at this page's own gallons. Follow a quantity to set your own reading.
Fixes Product Add
Lower pH
−0.5 pH 		HASA Dry Acid 2.96 lb
Raise total alkalinity
+40 ppm 		HASA Alkalinity Up 13.28 lb
Raise pH
+0.3 pH 		HASA Soda Ash 7.11 lb
Raise free chlorine
+2.5 ppm 		HASA CHLOR 1.90 qt
Shock the pool
+9.5 ppm 		HASA CHLOR 7.20 qt

Not quite your pool?

feet, the long side
feet
inches, the shallow and deep end averaged

Change any measurement and every figure on this page is worked again: the gallons, the drawing, the fill table and each dose.

Pools near this one

Updated October 2026

Sources and dates

Ranges are quoted from the code named beside them, product strengths from the manufacturer's own product page, each retrieved on the date shown.

This site publishes calculated water volumes and chemical quantities for home pool and spa owners. It is not a health, safety or professional service, and it does not replace the instructions printed on the product you are holding. Not affiliated with, endorsed by or sponsored by HASA, Pyrock Chemical, Pentair, Hayward, Sonoma Hot Tubs, the Centers for Disease Control and Prevention, or any state health department. Product names are the trademarks of their owners and appear here only to identify the strength of what is in the container.