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Pool size
Pool volume
Pool surface area
Opening & closing
Pool closing & winterizing
Pool opening
Pool chemistry
Chlorine
Pool shock
pH
Total alkalinity
CYA (stabilizer)
Salt
Equipment & energy
Pump run time
Pump energy cost
Heat pump sizing
Hot tub & spa
Hot tub volume
Hot tub chemistry
Hot tub electricity cost
All 16 tools Free, with the formula and sources on every page.
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Pool size

Pool volume
Pool surface area

Pool chemistry

Chlorine
Pool shock
pH
Total alkalinity
CYA (stabilizer)
Salt

Equipment & energy

Pump run time
Pump energy cost
Heat pump sizing

Opening & closing

Pool closing & winterizing
Pool opening

Hot tub & spa

Hot tub volume
Hot tub chemistry
Hot tub electricity cost

All 16 tools

Pool chemistry
Pool care & maintenance
Opening & closing
Equipment & energy
Hot tubs & spas
Glossary
All guides

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Free calculators and guides for US pool and hot tub owners. Every tool shows its formula and sources, so you can check our work.

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Calculators

Pool volume calculator
Chlorine calculator
Pool shock calculator
Pool closing planner
Hot tub electricity cost

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Pool chemistry
Pool care & seasons
Equipment & energy
Hot tubs & spas
All guides
Glossary

PoolOwl

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PoolOwl results are estimates based on the numbers you enter and published methods. Always read and follow chemical product labels, add chemicals to water (never water to chemicals), and retest before adding more.