Aquarium Treatment Dose Calculator
Scale a water conditioner or medication dose to your tank volume.
liters
ml
liters
How it works
Total dose = water volume ÷ volume covered by the label dose × label dose. Dose for the volume you are actually treating, so for a water change you can treat only the new water. Always follow the label, do not overdose, and remember that some medications require removing carbon from the filter. Teaspoons are US teaspoons of 4.929 ml, and drops assume 20 per ml. Example: A label that gives 5 ml per 40 liters needs 25 ml for 200 liters.
FAQ
Is this calculator free?
Yes. No signup is needed and nothing you enter is stored.
Is the result exact?
Results are rounded for display. For financial, medical, or legal decisions, confirm with a professional.
Do my numbers leave my device?
No. The calculation runs in your browser.