A free program for Android, by kame3.

This is a handy, versatile sales tax calculator app that helps you keep track of tax rates. The app’s user-friendly interface allows you to input sales tax or VAT amounts, calculate prices with and without sales tax, and even determine the amount of your refund.

Discount Sales Tax Calculator is the perfect application if you frequently shop. This helps you calculate percentages, which means you will know right away how much your total cost is if you have a discount coupon.

This is a free application available on the Google Play Store.