Add or remove GST from any amount at India's standard slab rates.
Adding GST (exclusive amount given): GST amount = Amount × rate/100; Total = Amount + GST.
Removing GST (inclusive amount given): Base amount = Amount / (1 + rate/100); GST = Amount − Base.
Common GST slabs in India are 5%, 12%, 18% and 28% depending on goods/services category — check the applicable slab for your item.