Water change calculator

Link a tank or aquascape project for live parameters and regional targets. Plan partial changes with source blending — always match temperature and salinity before adding.

Aquarium or setup

Aquarium volume (L)

Plan a partial change with source blending. Match temperature and salinity before adding. Values prefill from your latest log and project targets when linked.

Aquarium volume (L)Change %Current pHCurrent KH (dKH)Current nitrate (ppm, optional)Target pH (optional)Target KH (optional)

Add water source profiles for tap/RO blend predictions — especially useful when diluting hard municipal water to softer targets.

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