GST Calculator can ascertain level of duties on any sum you need to work out. We have separate choices dependent on current GST Tax Slabs in India. GST Calculator app includes following GST Tax Rate Slabs, ✔ +3% GST ✔ -3% GST ✔ +5% GST ✔ -5% GST ✔ +12% GST ✔ -12% GST ✔ +28% GST ✔ -28% GST India GST Calculator is a handy app which allows you to calculate all 4 GST tax rates at your finger tips. It takes-in an amount (either gross or net) and allows you to add or reduce GST from given amount. It