Pool Salt System Calculator
Use this calculator to determine how much pool-grade salt to add when converting your pool to a saltwater system or adjusting existing salt levels. The ideal salt concentration for most saltwater chlorine generators is between 2,700 and 3,400 ppm, with 3,200 ppm being the typical target.
Formula
Step 1 – Pure salt needed (grams):
Salt (g) = ΔSalt (ppm) × Pool Volume (gal) × 3.78541
Derivation: ppm = mg of salt per kg of water; 1 gallon of water ≈ 3.78541 kg; therefore mg of salt = ppm × gallons × 3.78541, and dividing by 1,000 converts mg → g.
Step 2 – Convert to pounds:
Salt (lbs, pure) = Salt (g) ÷ 453.592
Step 3 – Adjust for salt purity:
Salt (lbs, product) = Salt (lbs, pure) ÷ (Purity % ÷ 100)
Industry Rule of Thumb (verification):
~1 lb of 100% pure NaCl per 1,000 gallons raises salt level by approximately 120 ppm.