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A browser-based aquarium medicine dose calculator tool. No data sent to server.

📘 How to Use

  1. Enter your aquarium's width, depth, and water level in centimeters.
  2. Set the target concentration for the salt bath.
  3. Input the medicine's dosage instructions (e.g., amount per base water volume).
  4. Instantly view the calculated water volume, required salt, and medicine amounts.

Aquarium Medicine Dose Calculator

water_ph Aquarium Size

Estimated Water Volume
45.0 L

science Salt Bath Settings

*0.5% is generally recommended

Required Salt Amount
225.0 g

vaccines Medicine Bath Settings

Ex: If you add 1g per 10L of water, input '10' and '1'

Required Medicine Amount
4.50 g/ml
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Article

Aquarium Salt & Medicine Dose Calculator｜Accurate Treatment Dosages

This online tool helps aquarists accurately calculate the required amount of salt and medication for their fish tanks. Simply input your tank's dimensions and treatment specifications to get precise dosages, preventing common errors of under or overdosing and ensuring a safe treatment environment for your fish.

💡 Tool Overview

This calculator streamlines the process of preparing medicated or salt baths for your aquarium with the following features:

  • Automatic Water Volume Calculation: Determines the precise volume of water in your tank based on its width, depth, and actual water level, accounting for substrate and decorations.
  • Accurate Salt Dosing: Calculates the exact amount of salt (in grams) needed to achieve a specific salt concentration (e.g., 0.5%) for therapeutic salt baths.
  • Custom Medicine Dosage: Works with any commercial fish medication. Input the dosage instructions from the product label (e.g., 1 ml per 10 L) to find out the correct amount for your specific tank volume.
  • Prevents Calculation Errors: Eliminates manual math, reducing the risk of dosing mistakes that can be harmful or fatal to your fish.

🧐 Frequently Asked Questions (FAQ)

Q. Why is a 0.5% salt concentration often recommended?

A. A 0.5% salt concentration is a common therapeutic level for treating many common freshwater fish ailments, such as ich (white spot disease), mild fungal infections, and stress reduction. It helps fish with osmoregulation, which is the process of maintaining the proper balance of salt and water in their bodies. This reduces physiological stress, allowing the fish to use more energy to fight off disease. However, always research the salt tolerance of your specific fish species before starting treatment.

Q. Should I use the full tank height or the actual water level for the calculation?

A. For the most accurate results, you should always measure and input the actual water level. The total height of the tank is not representative of the water volume, as space is taken up by substrate, decorations, and the gap at the top. Using the water level ensures the dose is calculated based on the true amount of water being treated.

📚 Helpful Knowledge: The Science Behind Salt Baths

A salt bath is one of the most fundamental treatments in the aquarium hobby, and its effectiveness is based on the principle of osmoregulation. Freshwater fish live in an environment where the water has a much lower salt concentration than their own body fluids. As a result, water constantly tries to enter their bodies through osmosis. A healthy fish's kidneys work continuously to expel this excess water.

When a fish is sick or stressed, this osmoregulatory process can become a significant energy drain. By adding a controlled amount of salt to the aquarium water, you raise its salinity, bringing it closer to the fish's internal salinity. This reduces the osmotic pressure, meaning less water floods into the fish's body. The energy saved from osmoregulation can then be redirected by the fish's immune system to heal and fight off pathogens more effectively.