Aquarium Calculator & Tools

Aquarium Calculator puts the everyday numbers of fishkeeping in one simple app: how much water your tank holds, how much to change, and how much product to add according to its label. TANK VOLUME • Rectangle, cylinder, bowfront, corner (quarter circle) and hexagon tanks • Enter centimetres or inches and switch any time • Subtract the empty space at the top, the substrate depth and decorations for the real water volume • Results in litres, US gallons and UK gallons • Save your tanks and open them again with one tap WATER CHANGE PLANNER • See how many litres or gallons a 10–50% water change is • Find how many water changes it takes to bring a value such as nitrate from the current level down to your target • Or the single water change percentage that reaches the target, with the step-by-step values after each change • Takes your tap water value into account DOSE BY LABEL • Enter the product label (for example 5 mL per 40 L) and get the amount for your tank • A simple proportion of the label; always follow the product instructions UNIT CONVERTER • cm ⇄ inches, litres ⇄ US/UK gallons, °C ⇄ °F, dKH/dGH ⇄ ppm YOUR DATA STAYS ON YOUR PHONE • No account, no sign-up, works offline • Back up and restore your saved tanks with a file The app shows a small banner ad.