AbacusClassic Calculator for Android phones and tablets or Chromebooks is a free minimal-designed simple basic calculator app with additional functions and features. Calculator brings you customizable theme colors and photo, number display format choices, calculations of time and numbers, simple Preferences, built-in Quick Guide and hidable upper-screen ads. Calculator's 3-line display is easy to see all calculation values at a glance, and helps you double-check your entries faster. Your calculations can be shared through the clipboard. Experience Calculator’s improved look and feel.

Calculator’s features and functions make easy and simple for everyday calculations such as grocery amounts, tips, taxes, discounts, working hours, and more. The features include:

Improve Calculator's appearance. With no grid lines around the keys, a visually simple minimalistic style theme makes Calculator's look and feel simple, clean, modern yet elegant.

Hide ads temporarily. In the important meetings or transactions, ads hiding options keep you undisturbed from ads.

Calculate easy & press less. All functions are displayed and directly accessible on the theme. Neither a shift key nor swiping is required. Simply press numbers and functions to get the result. Every entry is highlighted when pressed or long-pressed.

Trace your calculation history easy. With a glance, it is easy to double-check your entries in the history display. Your operations or expressions are built up and shown as calculation history until you clear out. The display is automatically scrolled down during calculations and manually up and down.

Resume your last calculation anytime. Whenever you return to Calculator, your calculation data is automatically restored on the display and your calculation is always ready to be continued. From the history, you can easily find where you have left off in your calculation.

Customize your theme and display with unlimited colors and photos. Through color palettes, you can choose your style from selected color sets for the theme and display colors, or customize the color sets to your favorite ones with color sliders. Even more, you can personalize Calculator with your gallery photos.

Set your own number display formats. For your number style on the calculator displays, you can select round-up places and value as well as number separation markers. With your chosen number formats, the displayed numbers are as easy to read and accurate as you need. The displayed text sizes are also customizable.

Compare your setups. After setting up the theme and number formats, your recent settings are compared with the previous and default simply by pressing buttons.

The following functions improve usability:

Basics
* 5 arithmetic operators: multiplication, division, modulo, addition, and subtraction
* Percentage calculations: including markup, discount, profit, and margin
* Memory calculations: addition, subtraction, clear, and recall
* Backspace & Clear: Delete your last entries.
* Clear All: Clear all displays and reset calculation data except Memory and User Memory values.

Additional functions
* Hour-minute time calculation: Calculate hour and minute results instantly.
* Square & square-root
* Reciprocal
* Sign-change
* Clipboard copy & erase for displayed values
* Text-selection copy for history
* User Memory: Store your important number, such as a tax rate, foreign exchange rate, and others, to re-use for later calculations.
* Turn-Off: Turn off or exit the Calculator app and free up Calculator resources without losing Calculator data. When turning back on, the resume feature helps you continue the last calculation.

Visit the built-in Quick Guide and learn more about what Calculator can do for you.

If you find a bug or have suggestions for improvement, please contact us:

[email protected]