AquaCalcs.com provides free free aquarium calculators including tank volume, stocking levels, water chemistry, equipment sizing, and maintenance planning tools. With 28 calculators across 4 categories — from chlorine dosage and pH adjustment tools to pump sizing guides and cost estimators — we cover the tools users actually need, without the clutter.
Our mission is simple: give users accurate, fast, and free calculation tools with no barriers. There are no accounts to create, no paywalls to hit, and no personal data to hand over. You open a calculator, enter your pool details, and get your answer. That's it.
Every calculator on AquaCalcs uses standard pool industry formulas, established water chemistry equations, and real-world equipment specifications. We build each tool with care for both accuracy and speed, so the math runs entirely in your browser with instant results.
Whether you're calculating chlorine dosage for your weekly maintenance, sizing a pump for a new installation, estimating the cost of a pool renovation, or figuring out your hot tub drain schedule, AquaCalcs is here to help. We always recommend consulting a licensed pool professional for critical maintenance decisions.
Free, fast, and built for every user.