170,000 downloads worldwide!

This is a totally easy-to-use calculator.
It has all the basic features you'd expect from a calculator, as well as additional useful functions like the ability to calculate sales tax and discounts.

FEATURES
* History Tape - Reuse answer with a single tap
* Equation
* Sales Tax Calculations - Multiple tax settings with swipe change
* Discount Calculations with percentage operator (e.g., 100 - 30% = 70)
* Precise Rounding Settings
* Multiple Color Themes
* Multiple Font Sizes and Type Faces
* Left and Right Arrow Cursor Key - easy-to-edit expression
* Share Expression and Answer with other apps
* Support iPad
* Support Slide Over and Split View of iPad (If available)
* Sound Effects

If you want to reuse or edit a equation in history, swipe left it to show menu. You can select multiple options. You can also show menu by touch and hold history.

We welcome your feedback.

This is the free version of the app. A paid version is also available.
Paid version doesn't show ad and has four tax keys. (Free version has two tax keys)