The Buffer Solution Calculator determines the pH of a buffer solution using the Henderson–Hasselbalch equation. For an acidic buffer, the equation pH=pKa+log⁡([Salt][Acid])\text{pH} = \text{pKa} + \log\left(\frac{[\text{Salt}]}{[\text{Acid}]}\right)pH=pKa+log([Acid][Salt]​) is applied, while for a basic buffer the calculator uses pOH=pKb+log⁡([Salt][Base])\text{pOH} = \text{pKb} + \log\left(\frac{[\text{Salt}]}{[\text{Base}]}\right)pOH=pKb+log([Base][Salt]​) and converts it to pH with pH=14−pOH\text{pH} = 14 – \text{pOH}pH=14−pOH. By entering the values of pKa or pKb, and the concentrations of the salt and acid/base, the calculator instantly finds the buffer pH. It helps chemistry students and lab professionals predict how buffer solutions resist pH changes when small amounts of acid or base are added.