Enter your pool size, get the exact amount of salt, chlorine, or baking soda to add — plus pump and heater sizing. Built for pool owners, no signup, no fluff.
How many pounds (and 40-lb bags) of salt to reach 3,200 ppm in your saltwater pool.
Gallons for rectangular, round, oval and kidney-shaped pools. The starting point for every dose.
Exact bleach, cal-hypo or tablet dose to hit your target free chlorine level.
How much baking soda (or soda ash) to raise total alkalinity into the 80–120 ppm range.
The GPM your pump needs for a proper turnover — and what that means when buying a pump.
BTU per hour needed to warm your pool by your target temperature rise, in your timeframe.
Exact ounces of stabilizer to protect your chlorine from sunlight — and why more isn't better.
How much calcium chloride to bring CH into the 200–400 ppm range and protect your plaster.
Full step-by-step: generator choice, cost, how much salt to add, and your first 30 days.
Almost every common pool problem — cloudy water, low chlorine, salt cell warnings — comes back to one thing: how much of something to add to your pool. Guessing wastes chemicals and can push your water out of balance.
Pool Calc Hub gives you straight, formula-based answers. Every calculator shows the math it uses, uses the same conversion constants the pool industry uses (8.34 lbs per gallon of water), and works in both gallons and liters.
Yes — every calculator is 100% free, with no signup and no limits.
You can enter pool volume in gallons or liters, and results are shown in pounds/kilograms or fluid ounces, matching how products are sold in the US.
The formulas are the standard ones used across the pool industry. Real-world factors like backwashing, splash-out and rain can shift levels, so always re-test your water after adding chemicals and before adding more.