About PoolCareCalcs

PoolCareCalcs is a free set of calculators and finders for pool and hot tub owners: pool volume, chemicals, equipment, planning, hot tub and spa care, and converters.

Who runs this site

PoolCareCalcs is run by Chris Jensen, an independent individual based in Florida. It is not a company. I started it because information people were looking for was missing or hard to find, and I wanted pool and spa math in simple tools that show their method. Where the site says “we”, that is me. You can reach me at rusticreckoner@gmail.com or through the contact page.

Why this site exists

Pool care runs on numbers: gallons, parts per million, pounds per ten thousand gallons, BTUs and turnover hours. Most of them depend on one figure, your water volume, and a wrong volume throws every dose off. PoolCareCalcs starts with volume and builds from there, showing the rule behind each dose so you can see how the number was reached.

What you will find here

There are 28 calculators in six groups, plus seven finders:

• Volume: gallons for common pool sizes and shapes, plus above-ground and general volume calculators
• Chemicals: chlorine, salt, shock and a general pool chemical calculator
• Equipment: pump flow in gallons per minute and heater size in BTU
• Planning: a rough pool cost range and swimming calories burned
• Hot Tub & Spa: volume, chemicals, fill time and water cost, heat-up time, running cost, water change interval, pad weight and breaker and wire size
• Converters: cubic feet, gallons, liters, cubic meters and ppm to mg/L
• Finders: matches for pool type, cover, filter, heater and pump type, salt or traditional chlorine and what may be wrong with your water

Where the numbers come from

Each page lists the rule it uses. Volume pages use standard pool-industry formulas, doses come from rule-of-thumb rates published by pool-supply retailers and chemical manufacturers, equipment sizing follows the physics of heating water and the turnover-time targets that pool builders and pump makers use, and the converters use exact definitions such as those in NIST Handbook 44. Where a number is a rule of thumb, the page says so. The how we calculate page explains our approach and its limits.

What this site does not do

It does not test your water, it cannot read your product label and it does not replace a pool professional, an electrician or a structural engineer. It is not affiliated with any pool or chemical brand. See the disclaimer for the details.

How the site is paid for

PoolCareCalcs is free to use and is supported by advertising from Google AdSense. Advertising never changes a result. For how analytics and advertising cookies are handled, see the privacy policy.