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pH Calculator - Hydrogen Ion Concentration

Free pH calculator. Calculate pH from hydrogen ion concentration. Convert between pH, pOH, and H+ concentration.

Calculate pH from ion concentration

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pH Calculator

Calculate pH from hydrogen ion concentration. pH measures how acidic or basic a solution is on a scale of 0-14.

pH = -log₁₀[H⁺] | pH + pOH = 14

pH 7 = neutral. pH < 7 = acidic. pH > 7 = basic. Each pH unit = 10× difference in H⁺ concentration.

What's the pH of common substances?

Battery acid: 0, Lemon: 2, Vinegar: 2.5, Coffee: 5, Water: 7, Blood: 7.4, Soap: 9-10, Bleach: 12.5

Why is pH important?

pH affects chemical reactions, enzyme activity, and corrosion. Pool water needs pH 7.2-7.8, blood pH must stay 7.35-7.45.

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