Hot Tub Chemical Calculator
Calculate hot tub chemical doses for sanitizer, pH, and alkalinity. Keep your spa water balanced and safe.
How to Calculate Hot Tub Chemical Doses
- 1 Enter your hot tub volume in gallons or liters
- 2 Select your sanitizer system (chlorine, bromine, or saltwater)
- 3 Enter your current sanitizer, pH, and alkalinity levels
- 4 Review the target levels for optimal water balance
- 5 See the exact chemical amounts needed to adjust levels
- 6 Follow the maintenance schedule for ongoing care
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Last updated: January 15, 2026 · v2.1