Tools & Calculators

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Ammonia Toxicity Calculator

Calculate free ammonia (NH₃) from TAN, pH, and temperature. Compare against EPA criteria and koi-specific thresholds.

Calculate pond volume for rectangular, oval, kidney, and irregular shapes with varying depth zones.

Determine safe fish load based on pond volume, filtration capacity, and growth projections.

Size your biological and mechanical filtration based on pond volume, fish load, and feeding rate.

Calculate required GPH based on head height, pipe diameter, and target turnover rate.

Calculate salt needed for tonic, parasite treatment, nitrite detox, or salt dips — with dosing schedules and safety guidance.

Real-time water temperatures across the US from USGS, NOAA, and USACE stations with koi feeding zone overlays.

Assess pond turnover risk based on depth, temperature differential, wind exposure, and aeration status.