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A browser-based aquarium salt mixing calculator tool. No data sent to server.

📘 How to Use

  1. Enter the total volume of water you are mixing (in Liters)
  2. {'Choose your target criterion': 'Specific Gravity (SG) or Salinity (ppt)'}
  3. Select your brand of synthetic sea salt from the dropdown list

Aquarium Salt Mixing Calculator

1L 500L
1.010 1.020 1.030

*Grams needed for 1L at 1.023 (33ppt).

2100g

For 60 L of water

info Results are for reference only. Salinity varies with temperature and salt type. Always verify with a refractometer before adding water to your aquarium.

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Article

Aquarium Salt Calculator｜Perfect Salinity Made Easy

This tool helps saltwater and reef aquarium hobbyists accurately calculate the amount of salt mix needed for water changes or new tank setups. Simply input your water volume and desired salinity level to get an instant, precise measurement, ensuring a stable environment for your marine life.

💡 Tool Overview

  • Precise Salt Dosage: Eliminates guesswork by calculating the exact amount of salt mix required in grams for any volume of water.
  • Dual Measurement Modes: Set your target using either Specific Gravity (SG) or Salinity in Parts Per Thousand (ppt), the two most common standards in the hobby.
  • Brand-Specific Profiles: Features presets for popular synthetic sea salt brands (like Red Sea Salt, Coral Pro, Instant Ocean) to account for variations in density and formulation.
  • Instant & Interactive: Sliders and input fields provide real-time results, allowing you to fine-tune your parameters on the fly.

🧐 Frequently Asked Questions

Q. What is the ideal Salinity or Specific Gravity for a reef tank?

A. Most reef tanks thrive at a Specific Gravity (SG) of 1.024 to 1.026, which corresponds to a salinity of approximately 33-35 ppt (parts per thousand). However, it's crucial to research the specific needs of your corals and fish, as some species may prefer slightly different parameters. Fish-only tanks are often kept at a slightly lower salinity, around 1.020-1.023 SG.

Q. Why does the brand of salt mix matter?

A. Different manufacturers formulate their salt mixes with varying amounts of moisture and element concentrations. This means that the weight of salt required to reach a specific salinity level can differ from one brand to another. Our calculator uses the manufacturers' recommended dosages for popular brands to provide a more accurate starting point.

📚 Aquarium Salt Calculator Know-How

When mixing saltwater, it's important to understand the difference between Salinity and Specific Gravity. Salinity (measured in ppt) is a direct measurement of the total mass of dissolved salts in water. Specific Gravity (SG) is a ratio that compares the density of your saltwater to the density of pure freshwater.

Because water density changes with temperature, SG readings are temperature-dependent. For the most accurate and consistent results, always measure your saltwater with a refractometer or digital salinity pen at a consistent temperature. While this calculator provides an excellent starting point, you should always use the calculated amount as a guide and verify the final salinity with a reliable measuring device before adding the water to your aquarium.