Chemistry

pH Calculator

Calculate pH, pOH, [H⁺], and [OH⁻] from any known value. Covers acids, bases, and buffers.
Input
Results
pH Scale
0 (Strong acid)7 (Neutral)14 (Strong base)
Formula: pH = −log₁₀[H⁺]  ·  pOH = −log₁₀[OH⁻]  ·  pH + pOH = pKw (14 at 25°C)
📐 Accuracy Note: Results are calculated using standard formulas and are provided for educational and reference purposes. While we strive for accuracy, floating-point arithmetic and rounding may introduce small errors. Do not rely on this tool for safety-critical, professional, or high-precision applications without independent verification.