Percent Ratio Tax Multi Calc

Percent Ratio Tax Multi Calc is a specialized Chrome extension designed for quick and efficient rate conversions, tax calculations, and ratio computations. It supports multiple calculation histories with modifiable results, making it easy to track and adjust your figures.

The tool offers customizable rate settings and rounding methods — including rounded up, down, or off — accessible through a long tap on the rate change button. Its user-friendly interface allows copying and tapping within input boxes for smooth interactions.

Ideal for shoppers and businesses, this extension helps calculate tax changes (such as from 8% to 10%), compare prices inclusive or exclusive of tax, determine discounted prices like "30% OFF," and convert values using percentage scales. It eliminates the need for complex Excel formulas, improving business work efficiency and simplifying price tag updates.

Note: This extension does not support the four basic arithmetic operations; it is solely dedicated to rate and ratio conversions. User feedback and feature requests are welcomed to continually enhance functionality.