Salt Level Calculator
Calculates pounds of pool-grade salt needed to reach and maintain ideal salt concentration.
How it works
Salt Needed: (Target PPM - Current PPM) × Pool Vol ÷ 120000 = lbs40 lb bags = Lbs÷40, round up
- You enter
- Pool volume (gallons), current salt (ppm), target salt (ppm), SWG brand (for reference ranges)
- You get
- Salt needed (lbs), 40lb bags needed, salt needed (kg), cost estimate
How accurate is it? Salt doesn't evaporate with water; only physical water loss removes salt; SWG displays can drift (digital meter recommended).
These are estimates, not quotes. See How We Estimate.
Worked example
20,000-gallon pool current 2800 ppm, target 3200 ppm: (3200-2800)×20000÷120000 = 66.7 lbs ≈ 2 bags of 40lb salt.
Tap an example above the calculator to see it worked with live numbers.
Reference table
| Product | Per 10,000 gallons | Changes |
|---|---|---|
| Liquid chlorine (12.5%) | 10.2 fl oz | Free chlorine +1 ppm |
| Cal-hypo shock (65%) | 2 oz | Free chlorine +1 ppm |
| Dichlor (56%) | 2.7 oz | Free chlorine +1 ppm |
| Muriatic acid (31.45%) | about 12 fl oz | pH −0.2 (at TA 100) |
| Soda ash | about 6 oz | pH +0.2 (at TA 100) |
| Baking soda | 1.5 lb | Alkalinity +10 ppm |
| Calcium chloride (77%) | 1.25 lb | Calcium hardness +10 ppm |
| Stabilizer (CYA) | 13 oz | CYA +10 ppm |
| Pool salt | 0.83 lb | Salt +10 ppm |
When to use it
Maintains proper salt levels (2700-3400 ppm) for salt chlorine generator efficiency and consistent chlorine production.
Initial SWG pool setup, weekly/monthly salt maintenance, after heavy rain dilution, after backwashing, seasonal adjustments.