Convert between hydrogen ion concentration and pH in either direction and see the full acid base picture. pH is defined as the negative base ten logarithm of the hydrogen ion concentration in moles per liter, so a concentration of 1e-7 gives a neutral pH of 7 at room temperature. Enter a concentration to get the pH, or enter a pH to recover the concentration, and this tool also reports pOH and the hydroxide ion concentration using the relationship that pH plus pOH equals 14. It then classifies the solution as acidic, neutral or basic. This is a staple for chemistry students, lab work and water testing. Everything is computed locally in your browser, so your numbers stay private and results appear the moment you type.
Convert between hydrogen ion concentration and pH in either direction and see the full acid base picture. pH is defined as the negative base ten logarithm of the hydrogen ion concentration in moles per liter, so a concentration of 1e-7 gives a neutral pH of 7 at room temperature.
Yes. pH Calculator is completely free, with no sign-up and no usage limits.
Yes. pH Calculator runs in any modern web browser. There is nothing to download or install.
Yes. pH Calculator runs entirely on your device in your browser, so nothing you enter is uploaded to a server.