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Free Pool Calculators for Every Job Around the Water

Every Pool Calculators gives you one place to work out pool volume, salt and chlorine doses, pump and heater sizing, water loss and build costs. Type your numbers and get an answer right away. Pool owners, builders and service techs all use the same tools here.

Pool Volume Calculator Pool Salt Calculator

All pool calculators

Every tool sits on this page. Pick a category and open the calculator you need in one click.

Illustration of a swimming pool with length, width and depth measurements marked

Volume & Size Tools

Work out how big your pool is and how much water it holds.

Illustration of pool test strips, a test vial, chlorine tablets and a bag of pool salt

Water Chemistry Tools

Get the dose right before you pour anything in the water.

Illustration of a pool pump and sand filter connected with plumbing

Equipment & Maintenance Tools

Size the gear that moves, filters and heats your water.

Illustration of a pool beside a calculator, coins and a rising cost chart

Cost & Planning Tools

Plan the budget, the payments and the water you lose each week.

Pool calculator questions

Short answers to the questions we get most across the tool set.

How do I calculate my pool volume?

Multiply the surface area by the average depth to get cubic feet, then multiply by 7.48 for US gallons. A 16 by 32 foot pool with a 5 foot average depth holds about 19,150 gallons.

How much salt does a saltwater pool need?

Most chlorine generators run at 2,700 to 3,400 ppm. Going from zero to 3,200 ppm takes roughly 27 pounds of salt per 1,000 gallons of water.

How much chlorine should I add?

Hold free chlorine between 2 and 4 ppm. The amount depends on your gallons and the strength of the product, so dose by product type rather than by the scoop.

What size pump does my pool need?

Pick the pump by flow rate. Divide your gallons by the turnover hours you want, then divide by 60 to get the gallons per minute the pump has to move.

Are these pool calculators free?

Yes. Every calculator on this site is free, runs in your browser and needs no sign up. Nothing you type is sent anywhere.