[ FREE TOOLS · NO SIGN-UP REQUIRED ]
Free, no-frills tools for freshwater aquarium keepers. Enter your numbers, get your answer.
These calculators cover the measurements planted tank keepers check most often — CO2 levels, water parameters, and tank planning. No accounts, no paywalls. Every tool runs entirely in your browser.
§ 01 · Calculators
CO2 / pH / KH Calculator
Enter your pH and KH readings to calculate exact dissolved CO2 levels. Includes status rating and adjustment advice.
Use Calculator →Aquarium Volume Calculator
Calculate tank volume from dimensions. Supports rectangular, bow-front, and hex tanks. Useful for CO2 dosing and water change planning.
Coming SoonFertilizer Dosing Calculator
Calculate EI method fertilizer doses for your tank volume. Covers macros and micros with weekly schedule output.
Coming Soon[ Planted Tank Guides ]
From the Guide Library