# DrPhos' pH Calculator — Master pH Problems Instantly > Chemistry calculator for pH, pOH, and ion concentrations. (iPhone/iPad app by Monte L Helm.) - Source: https://appshunter.io/ios/app/drphos-ph-calculator/id6477762321 (this page in markdown: same URL + `.md`) - Developer: [Monte L Helm](https://appshunter.io/developer/1715082616) - Category: Education, Utilities - Price: $0.99 with in-app purchases - Rating: 3.67/5 from 3 App Store ratings - Age rating: 4+ - Requires: iOS 17.2 · 15 MB - Languages: English - Released: 2024-02-12 - Data updated: 2026-06-04 - Monetization: free with in-app purchases - User reviews in markdown: https://appshunter.io/ios/app/drphos-ph-calculator/id6477762321/reviews.md ## What is 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. ## Key features - Calculate pH, pOH, [H⁺], or [OH⁻] - Handles strong and weak acids/bases - Supports Ka and Kb values - Built-in molarity and scientific notation - Automatic pH + pOH = 14 - Clean, focused layout ## Pricing and in-app purchases Base price: $0.99. **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | Science Calculator | $0.99 | one-time | | Quadratic Equation Solver | $0.99 | one-time | | Significant Figures Calculator | $0.99 | one-time | | Molar Mass Calculator | $0.99 | one-time | | Stoichiometry | $0.99 | one-time | | pH Calculator | $0.99 | one-time | | Ionic Compound Builder | $0.99 | one-time | | General Chemistry Naming | $0.99 | one-time | | Solution Concentrations | $0.99 | one-time | | Reaction Balancer | $0.99 | one-time | | Kinetics Calculator | $0.99 | one-time | ## Frequently asked questions about DrPhos' pH Calculator ### What is DrPhos' pH Calculator used for? DrPhos' pH Calculator is designed to instantly solve acid-base problems in general chemistry. It can calculate pH, pOH, [H⁺], and [OH⁻] for both strong and weak acids and bases. ### Does DrPhos' pH Calculator handle weak acids and bases? Yes, DrPhos' pH Calculator automatically solves equilibrium expressions for weak acids and bases using their respective Ka or Kb values. ### Can I convert between pH and concentration with DrPhos' pH Calculator? Yes, the app allows you to convert between pH and concentration, as well as calculate [H⁺] or [OH⁻] from any single given value. ### What additional chemistry tools are available with DrPhos' pH Calculator? You can unlock more chemistry tools, such as a Significant Figures Counter, Molar Mass Calculator, and Equation Balancer, through in-app purchases. ### How much does DrPhos' pH Calculator cost? The base DrPhos' pH Calculator is free. Individual additional tools can be unlocked for $0.99 each, or you can purchase the full GenChem Helper for $9.99. ### What devices support DrPhos' pH Calculator? DrPhos' pH Calculator is available for iPhone and iPad devices. ### How often is DrPhos' pH Calculator updated? The latest version, 3.0, was released on July 29, 2025, indicating active development and updates. ### What is the age rating for DrPhos' pH Calculator? DrPhos' pH Calculator has an age rating of 4+, making it suitable for a wide range of users. ## Version history (last 5 releases) ### 3.0 — 2025-07-29 • Now supports weak acid and base calculations using Ka and Kb • Improved UI for entering concentrations and switching between inputs • Added visual feedback for calculated values • Bug fixes and performance improvements for smoother operation ### 2.3.1 — 2024-10-17 Minor improvements and bug fixes. ### 2.3 — 2024-07-17 Bug fixes and updated graphics ### 2.2.2 — 2024-06-29 bug fixes added kinetics calculator ### 2.1 — 2024-06-17 Fixed a bug that was causing crash when decimal point was entered first. Added the Kinetics Calculator app as optional in-app purchase. ## Apps similar to DrPhos' pH Calculator | App | Rating | Price | Category | | --- | --- | --- | --- | | [TeachFX](https://appshunter.io/ios/app/teachfx/id1329178826) | 5.0 (20) | Free | Education | | [Picmonic Anatomy & Physiology](https://appshunter.io/ios/app/picmonic-anatomy-and-physiology/id1468975572) | 4.9 (230) | Free | Education | | [Wend.](https://appshunter.io/ios/app/wend/id1518680025) | 3.8 (92) | Free | Education | | [Pocket Chemist](https://appshunter.io/ios/app/pocket-chemist/id1619691624) | 5.0 (4) | Free | Education | | [Carolina® RGB Colorimeter](https://appshunter.io/ios/app/carolina-rgb-colorimeter/id6445908681) | 5.0 (1) | Free | Education | | [Mentone Seventh-day Adventist](https://appshunter.io/ios/app/mentone-seventh-day-adventist/id1601885399) | 4.3 (4) | Free | Education | ## More apps by Monte L Helm - [DrPhos' Molar Mass](https://appshunter.io/ios/app/drphos-molar-mass/id6471319631) - [Ionic Compound Builder](https://appshunter.io/ios/app/ionic-compound-builder/id6472619902) - [DrPhos' Ionic Compounds](https://appshunter.io/ios/app/drphos-ionic-compounds/id6473097401) - [DrPhos' Reaction Balancer](https://appshunter.io/ios/app/drphos-reaction-balancer/id6474077005) - [DrPhos' Stoichiometry](https://appshunter.io/ios/app/drphos-stoichiometry/id6475633178) - [DrPhos' GenChem Naming](https://appshunter.io/ios/app/drphos-genchem-naming/id6476617346) All apps by Monte L Helm: https://appshunter.io/developer/1715082616 --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-04.*