๐ฌ Science
pH Calculator
pH is the negative logarithm of hydrogen ion concentration, so each whole unit is a tenfold change โ which is why a pH of 4 is a hundred times more acidic than a pH of 6. Strong acids and bases are treated as fully dissociated here, which is accurate for the common mineral acids.
How it works
Concentration
Substance type
Temperature
pH
pOH
Hydrogen ion concentration
Hydroxide ion concentration
Solution
Ion product of water
Frequently asked questions
How do I use the pH Calculator?
Fill in the fields above โ the result recalculates instantly as you type. Everything runs in your browser, so the values you enter are never collected or stored.
Is this calculator free?
Yes. It is completely free, requires no account, and works on phones, tablets and desktops.