Aquarium tools
Aquarium tools
A curated set of calculators and charts that help you understand your tank and make better decisions.
Fertilizer calculator
Convert salts, solutions, and doses for planted-tank fertilization.
CO₂ / pH / KH chart
Estimate dissolved CO₂ from pH and KH — a quick check for planted tanks.
Water-change calculator
Work out the % and litres to change to hit your target parameter.
Aquarium calculator
Plan a new tank: volume, glass thickness, and total weight from the dimensions you have in mind.