The PH scale is from 0 to 14.
The PH scale is from 0 to 14.

Buffer Capacity Calculator

If you want to determine the amount of change resisted by a buffer in pH, you can use our buffer capacity calculator.

What is Buffer?

Before explaining the buffer capacity, we should know what a buffer is. A buffer is a fundamental aquatic solution in chemistry that carries a compound/mixture of a weak acid and its conjugate base ( A base formed by multiple mixed chemical compounds) or vice versa. The pH value varies lit-bit after adding a minute quantity of concentrated acid/base.

What is Buffer Capacity?

Now, after determining the buffer, we can define buffer capacity as:

quantity of an acid/base mixed in buffer solution's volume before its pH changes the value is called buffer capacity.


Formula of Buffer Capacity Calculator

To determine buffer capacity instantly, you can use our calculator, or to find it manually, you can use the formula for buffer capacity listed below; 

β = n / ΔpH


Buffer Capacity = amount acid or base / (final pH - initial pH)


  • β = Buffer capacity

  • n = Amount of moles (of acid/base) mixed in buffer solution (per liter).

  • ΔpH = final pH - initial pH (Change in the value of pH)


To know about perpendicular lines, visit our Perpendicular Line Calculator.


A buffer solution has initial pH & final pH is 7.4 & 6.20 and an amount of acid with 0.05 mol/l. find buffer capacity?

Given data

initial pH = 7.4
final pH = 6.20
amount of acid = 0.05 mol/l

To Find

buffer capacity = ? 


To get buffer capacity, let's use the formula below:

buffer capacity = amount of acid / (final pH - initial pH)

Putting values in the formula:

buffer capacity = 0.05 / (6.20 - 7.4)
buffer capacity = -0.041667 mol/l

How to use Buffer Capacity Calculator?

The steps to use a buffer capacity calculator are as follows:

Step 1: Enter the value of moles in the first required input.

Step 2: Enter the change in the value of pH in the second required input.

Step 3: The calculator will automatically display an answer on the screen.

Calculator use

You can use our buffer capacity calculator widely in pharmacy and chemical solutions; it can play a vital role during parenteral (injections) preparations, stability of formulations, intensify the solubility of the drug, and for optimum therapeutic effect.