Aquarium pH Adjustment Calculator

Struggling to balance your tank’s pH? This Aquarium pH Calculator helps you safely adjust your aquarium’s pH level without guessing.

Just enter your current pH, target pH, and tank size. You’ll get step-by-step advice, dosage suggestions, and the safest way to raise or lower pH in your fish tank—whether you’re keeping betta fish, goldfish, shrimp, or even turtles.

Why Is pH Important in an Aquarium?

Keeping the right pH level is key to a healthy aquarium. A sudden jump or drop in pH can shock your fish, harm their immune system, or kill off your beneficial bacteria. That’s why this tool only recommends safe pH change limits—no more than 0.3 per day.

How to Raise pH in an Aquarium

If your tank’s pH is too low, this calculator may suggest:

Adding baking soda to your aquarium (1 tsp per 5 gallons can raise pH by about 0.2)
Placing crushed coral or aragonite sand in your filter or substrate
Using commercial products like Seachem Alkaline Buffer

How to Lower pH in a Fish Tank

To lower high pH safely, it may guide you to:

Add Indian almond leaves or driftwood
Use peat moss in a mesh bag inside your filter
Try Seachem Acid Buffer or other pH-lowering products

Works for Any Freshwater Setup

Whether you have a planted tank, shrimp tank, community aquarium, or turtle tank, this tool adapts to your setup and gives tailored tips.

Use the calculator now and take the guesswork out of water chemistry. Bookmark it if you often wonder what to add to raise or lower pH in your fish tank.