Calculate the pH of solutions effortlessly with Enter your values and get instant, accurate results for any pH calculation.



pH scale

How to Use the pH Calculator

Step 1: Select Calculation Method

  • Choose either “Calculate using Concentration” or “Calculate using Mass & Volume” as the method for your calculation.

Step 2: Enter Chemical Information

  • In the “Chemical” field, type the name of the chemical you are analyzing. You can search for the chemical using the search bar.

Step 3: Input Concentration

  • In the “Concentration” field, enter the concentration of the chemical solution. Ensure you select the correct unit (Molarity or another unit) from the dropdown menu.

Step 4: Calculate pH

  • Click on the purple “Calculate” button to compute the pH of the solution.

Step 5: View Results

  • The calculated pH value will be displayed in the “pH” field below the input section.

Step 6: Optional – Molar Mass

  • If you chose to calculate using mass and volume, enter the molar mass of the chemical in the “Molar Mass” field. The molar mass can be found in g/mol.

pH Formula

The pH of a solution is calculated using the following formula:



  • [H+] represents the concentration of hydrogen ions (H+) in the solution, usually measured in moles per liter (M).

pH Calculator Examples

Example 1:

Hydrogen Ion Concentration: 1×10−4

  • Calculation: pH=−log⁡(1×10−4)
  • Result: pH=4
  • Conclusion: The solution is acidic.

Example 2:

Hydrogen Ion Concentration: 1×10−7

  • Calculation: pH=−log⁡(1×10−7)
  • Result: pH=7
  • Conclusion: The solution is neutral.

Example 3:

Hydrogen Ion Concentration: 1×10−9

  • Calculation: pH=−log⁡(1×10−9)
  • Result: pH=9
  • Conclusion: The solution is alkaline.

Example 4:

Hydrogen Ion Concentration: 3.16×10−5

  • Calculation: pH=−log⁡(3.16×10−5)
  • Result: pH=4.5
  • Conclusion: The solution is acidic.

Example 5:

Hydrogen Ion Concentration: 7.94×10−3

  • Calculation: pH=−log⁡(7.94×10−3)
  • Result: pH=2.1
  • Conclusion: The solution is highly acidic.

How does a pH calculator work?

A pH calculator uses the formula pH=−log⁡[H+]to compute the pH level. You need to input the concentration of hydrogen ions (H+) in the solution, and the calculator will provide the pH value.

Is the pH calculator accurate?

Reputable pH calculators are generally accurate if you provide precise input values. For best results, ensure your data is correct and follow any specific instructions provided by the calculator tool.

Can I use the pH calculator for any type of solution?

Yes, a pH calculator can be used for any aqueous solution where you can determine or know the concentration of hydrogen ions. This includes acids, bases, and neutral solutions.

Do I need an internet connection to use a pH calculator?

Some pH calculators are web-based and require an internet connection, while others are available as offline apps or software.

Can I export or save the results from a pH calculator?

Some pH calculators offer features to export, save, or print the results. Check the specific tool’s options for these functionalities.

Can a pH calculator handle very small or very large hydrogen ion concentrations?

Yes, most pH calculators can handle a wide range of hydrogen ion concentrations, from very dilute to very concentrated solutions. Just ensure the values are accurately input to get correct results.