250+ iOS apps curated and reviewed
The best tdh calculator apps on iPhone average 4.1★ across 250+ titles — we've ranked them by what real users actually keep on their phones. Updated August 2026.
| # | App | Price | Rating | Ads | In-App Purchases | Updated |
|---|---|---|---|---|---|---|
| 1 |  | Free | 5.0★ (3) | No | No | May 2026 |
| 2 |  | Free | — | No | No | May 2026 |
| 3 |  | Free | 5.0★ (1) | No | No | May 2026 |
| 4 |  | Free | 5.0★ (1) | No | No | May 2026 |
| 5 |  | Free | 4.9★ (409K) | Yes | No | Aug 2026 |
| 6 |  | Free | — | Yes | Yes | Jul 2026 |
| 7 |  | Free | — | Yes | No | Aug 2026 |
| 8 |  | Free | 4.7★ (61K) | No | No | Aug 2026 |
This utility app helps calculate key centrifugal pump performance metrics like head, suction, and friction loss. It also suggests suitable pumps from a catalog and allows saving and sharing results. It's designed for field use on Apple devices, functioning offline.
This utility app assists engineers and technical personnel in calculating system parameters for slurry pipe and pump sizing. It computes required head pressure and limiting settling velocity based on user-inputted system data. The tool aims to simplify the selection process for slurry pumps.
This app simplifies system requirement calculations for pumps. Users input details like flow rate, pipe type, size, and length to determine total dynamic head, NPSHa, and losses. It helps users select the correct pump based on actual conditions, saving time onsite or remotely.
This utility app offers a clean and intuitive interface for performing calculations. It prioritizes a user-friendly design with large buttons and a clear display for quick and efficient use.
This app offers both basic and scientific calculation modes with over 30 scientific operations. It allows for customization of the app's appearance and includes features for note-taking, drawing, and viewing calculation history. It supports high accuracy calculations and nested parentheses.
This app offers a comprehensive scientific calculator with advanced functions for math, finance, and engineering. It includes unit and currency conversion, a constants library, and a biorhythm calculator for daily insights. The interface is intuitive and supports multiple calculation modes.
A simple, neat, and brilliant calculator that displays entire calculations and answers at once. Personalize your experience by choosing your favorite color theme. Works on iPhone and iPod.
This utility app offers a comprehensive suite of calculators for everyday financial, health, and date-related needs. It includes tools for loans, investments, taxes, health metrics, and unit conversions, along with a math solver.
A straightforward and user-friendly calculator designed for iPhone and iPad. It offers standard calculation logic, basic math operations, and a history display for convenience. Optimized for a simple and efficient user experience.
Perform essential math operations like addition, subtraction, multiplication, and division without any interruptions. Save your calculations with custom titles for easy retrieval and reuse.
A fast, clean, and easy-to-use calculator app offering both basic and advanced scientific functions. It features a minimal design, calculation history, and supports dark and light modes for a comfortable daily calculation experience.
This app offers both basic and advanced scientific calculations with an intuitive interface designed for tablets and phones. It includes features like currency conversion, calculation history, and the ability to share results. An optional premium membership removes ads and provides enhanced support.
