PH Calculator
Calculate pH from hydrogen ion concentration, or find H+ concentration from pH.
—
pH
—
pOH
—
Solution Type
Recent Calculations
What Is PH?
pH measures how acidic or basic a solution is on a scale of 0-14. pH 7 is neutral, below 7 is acidic, above 7 is basic.
Formula
pH = −log₁₀[H⁺]Example
A solution with H⁺ concentration of 0.001 M has pH = −log(0.001) = 3 (acidic).
Frequently Asked Questions
What does the pH scale mean?
Each pH unit represents a 10× change in H⁺ concentration. pH 3 is 10× more acidic than pH 4.
What's the pH of common substances?
Lemon juice: ~2, Coffee: ~5, Water: 7, Baking soda: ~9, Bleach: ~12.