Pool Salt Calculator
How much salt does my pool need? Enter your pool's gallons plus current and target salt levels in ppm, and this salt pool calculator tells you exactly how many pounds of pool salt to add. Switch tabs for a pool chlorine calculator, pool shock calculator dose for free chlorine, or a pool volume estimator if you don't know your gallons.
Frequently Asked Questions
How much salt does my pool need?
Most saltwater pools target 3,000–3,500 ppm. This salt pool calculator compares your current reading to your target and converts the difference to pounds of pool salt using your pool's gallonage — a typical 20,000-gallon pool rising from 0 to 3,200 ppm needs roughly 530 lb of salt.
How does the pool chlorine calculator work?
Enter your gallons and current free chlorine (FC) reading plus your target. The calculator assumes standard 73% calcium hypochlorite shock, where 1 lb per 10,000 gallons raises FC by about 7 ppm, and converts that to ounces of shock to add.
What does the pool shock calculator assume?
It assumes calcium hypochlorite (cal-hypo) at 73% strength — the common granular shock. If you use dichlor or liquid chlorine instead, doses differ, so always check the product label and retest the water after dosing.
How do I estimate pool volume if I don't know my gallons?
Use the Pool Volume tab: pick rectangle, round, or oval, enter the dimensions in feet, and it converts cubic feet to gallons. Rectangle pools use length × width × average depth × 7.48; round and oval shapes use their standard factors.