Great Calculator

Great Calculator is a polished all-in-one calculator suite for iPhone and iPad that combines everyday math, scientific tools, graphing, geometry, finance, time, number analysis, permutations, fractions, percentages, unit conversion, and currency conversion in a single organized app.

Instead of jumping between separate calculator apps, Great Calculator gives you focused workspaces built for the job you need right now. Switch quickly between Basic, Scientific, Percentages, Fractions, Graphing, Geometry, Unit Conversion, Numbers, Permutations, Money, and Time, while keeping a consistent layout, integrated keypad workflow, and clean result presentation across the app.

Core capabilities include:
• Basic and scientific calculation for daily and advanced math
• Fraction and percentage tools for quick problem solving
• Geometry helpers for common 2D and 3D formulas
• Unit conversion across practical real-world categories
• Money tools for currency conversion and financial calculations
• Numbers tools for features, averages, GCF/LCM, and random ranges
• Permutations, combinations, factorial, and list generation
• Time tools for elapsed time, countdowns, and between-date distance
• Graphing tools with expressions, tables, window controls, and sliders
• Home Screen widgets for quick access to common calculator workflows

The Numbers workspace goes beyond simple prime checking. The Features view reports whether a value is prime or composite and can surface useful characteristics such as parity, factorization, divisor details, digit metrics, and related number properties. Other tabs make it easy to calculate averages, find GCF/LCM values, and generate random values within a chosen range.

The Graphing workspace is designed for both clarity and power. You can graph standard expressions, use x and y relations, build tables of values, adjust the visible window numerically, and work with parameter sliders for expressions that use variables beyond x and y. The graphing system also supports broader relation authoring such as vertical relations, implicit relations, circles, and inequality-based graphing workflows.

The Money workspace combines live currency conversion with practical financial tools such as APR, auto, mortgage, TVM, 401K, ROI, discount, and tip calculations. When you request live exchange rates, the app clearly identifies the conversion provider and update time so you understand the source behind the displayed result. Most other calculators work entirely on-device.

The Time workspace helps with both live time calculations and date-to-date planning. You can measure elapsed time to or from a selected moment, or switch to Between Dates to compare a start date and end date with clear calendar markers and structured results. The app also includes organized support, legal, privacy, and accessibility resources inside the interface.

Great Calculator is built to stay readable and practical across a wide range of screen sizes, from smaller iPhones through larger iPads. The interface emphasizes spacing, clarity, consistent controls, and fast task completion instead of visual clutter.

Internet access is only used when you explicitly request the latest available exchange-rate data for currency conversion. History and preferences are stored locally on your device under your control. Great Calculator is designed for students, professionals, families, and everyday users who want one dependable utility app instead of a folder full of separate calculators.

Additional conveniences include organized expression entry, adaptive keypad layouts for different calculator modes, result cards that surface the most important values first, and dedicated tools for editing. Great Calculator is designed for utility: open it, choose the right workspace, enter values, and get a clear answer quickly. Whether you are solving homework, planning finances, converting units, exploring graphs, or comparing dates, it keeps essential tools together in one experience.