DrPhos' pH Calculator

Easily Calculate pH, pOH, [H⁺], and [OH⁻]

The DrPhos pH Calculator is a fast, reliable tool for solving acid-base problems in general chemistry. It supports both strong and weak acids and bases—automatically solving equilibrium expressions using the appropriate Ka or Kb values.

Whether you’re converting between pH and concentration, calculating [H⁺], or just checking your work, this app provides accurate, instant results.

Features:
• Calculate pH, pOH, [H⁺], or [OH⁻] from any one value
• Handles strong and weak acids/bases with Ka or Kb
• Built-in support for molarity and scientific notation
• Maintains pH + pOH = 14 automatically
• Clean, focused layout with visual feedback

Need more chemistry tools?
Unlock additional features within the app or explore the full DrPhos GenChem Helper, which includes:
• Significant Figures Counter
• Molar Mass Calculator
• Ionic Compound Builder
• General Chemistry Naming Tool
• Equation Balancer
• Stoichiometry Solver
• Solution Concentration Calculator
• Integrated Rate Law Calculator
• Scientific Calculator
• Quadratic Equation Solver

Unlock individual tools for $0.99 each—or get everything in the full GenChem Helper for just $9.99.