Label-based dose calculator
Enter the dose exactly as printed on the product label, then choose whether you are dosing the full tank or only new replacement water.
This calculator only scales the amount on a product label. It does not diagnose fish, choose treatment products, or replace label directions, a veterinarian, or an experienced aquatic professional.
How to use an aquarium dosing calculator safely
Aquarium dosing is safest when it starts from the product label and the real amount of water being dosed. For a water change, dose the replacement water unless the product label says otherwise. For fertilizers and routine additives, keep notes and make changes gradually so fish, shrimp, plants, and beneficial bacteria are not shocked.
Aquarium dosing FAQ
Should I dose the full tank or only new water?
For water conditioner during a water change, many aquarists dose the replacement water volume. Some products or situations may call for full tank volume, so follow the product label.
Can this calculate medication for sick fish?
This tool only scales a label amount to a water volume. It does not diagnose disease, select medicine, or recommend treatment strength. Follow the product label and qualified professional guidance.
Why use real water volume instead of tank size?
Substrate, rocks, wood, filters, decorations, and the waterline reduce actual water volume. Using real water volume can avoid overdosing compared with the advertised tank size.