Convert between [H⁺], [OH⁻], pH, pOH — Instantly!
Our free pH and pOH Calculator helps students, chemistry professionals, and laboratory technicians instantly convert between hydrogen ion concentration [H⁺], hydroxide ion concentration [OH⁻], pH, and pOH values. Whether you're analyzing chemical solutions, performing laboratory experiments, studying acid-base chemistry, or preparing for chemistry exams, this tool provides accurate calculations following standard chemical formulas.
Calculate pH from concentration, determine pOH from hydroxide ions, find [H⁺] from pH, convert between acidity and alkalinity measurements, and understand acid-base relationships with our specialized chemistry calculator.
Our calculator uses precise logarithmic calculations and the ion product of water (Kw = 1×10⁻¹⁴) to ensure laboratory-grade accuracy for all pH and pOH conversions.
Get immediate results without manual logarithmic calculations. Convert between all four acid-base parameters in seconds, saving time on homework and lab work.
Perfect for chemistry students at all levels. Visualize the pH scale relationship and understand the inverse connection between [H⁺] and [OH⁻] concentrations.
Use our calculator on any device - desktop, tablet, or mobile. Perfect for quick calculations in the laboratory, classroom, or during study sessions.
Used by chemistry students, teachers, laboratory technicians, and researchers worldwide. No registration required - calculate pH and pOH values instantly!
pH and pOH are related by the formula: pH + pOH = 14 (at 25°C). This relationship comes from the ion product of water: [H⁺] × [OH⁻] = 1×10⁻¹⁴. As pH decreases (more acidic), pOH increases, and vice versa.
pH is calculated using the formula: pH = -log₁₀[H⁺]. For example, if [H⁺] = 0.001 M, then pH = -log(0.001) = 3. Our calculator performs this logarithmic calculation automatically.
A pH of 7 indicates a neutral solution where [H⁺] = [OH⁻] = 1×10⁻⁷ M. Pure water at 25°C has a pH of 7. Values below 7 are acidic, while values above 7 are basic (alkaline).
Yes, our calculator uses scientific notation to accurately represent extremely small concentrations (e.g., 1×10⁻¹² M) and can handle the full pH scale range from 0 to 14, corresponding to [H⁺] from 1 M to 1×10⁻¹⁴ M.