Free calculators for homeowners and pool techs — work out your volume, dose chemicals, and balance your water. Instant results, shareable links, no email required.
Estimate the cost and time to heat your pool — gas heater vs. electric heat pump.
Coming soonCheck your Langelier Saturation Index so water isn’t scaling or corroding.
Coming soonKeeping a pool balanced comes down to numbers: how much water you have, how much of each chemical to add, and whether your water is in range. Free Pool Tools turns those numbers into quick, dependable calculators that work the same for homeowners and pool professionals — no sign-up, no app, no email.
Start with the pool volume calculator to find your gallons — it’s the foundation every chemical dose is based on. From there, our chemistry tools build on that volume to tell you exactly how much to add. Every result comes with the formula we used and a link you can share.
Yes — every calculator on Free Pool Tools is completely free, with no account, sign-up, or email required. Run as many calculations as you like.
Both homeowners looking after their own pool and working pool techs who need quick, reliable numbers in the field. The calculators handle in-ground and above-ground pools, plus spas and hot tubs.
Each calculator uses standard pool-industry formulas and shows the math so you can check it. Treat the results as solid estimates for planning and dosing, and always confirm your water chemistry with a test kit before adding chemicals.
Yes. Every tool builds a shareable link that restores your exact inputs, so you can send a result to a customer, family member, or friend and they will see the same numbers.
Chlorine dosing, cyanuric acid (CYA), salt, water balance (LSI), and pool heating cost calculators are on the way. The pool volume calculator is live now.