About the GST Calculator
Add GST to a price, or pull GST out of a GST-inclusive price, at any rate. Intra-state sales split GST equally into CGST and SGST, and inter-state sales charge it as IGST. Check the current rate for your goods or service on the official GST portal.
How to use
- Enter the amount and pick a rate (or type your own).
- Choose whether the amount already includes GST.
Formula
Add: GST = A × r/100 · Remove: Net = A × 100 ÷ (100 + r)
Frequently asked questions
How do I calculate GST on an amount?
Multiply the amount by the GST rate ÷ 100. For example, 18% GST on 1,000 is 180, so the total is 1,180.
How do I remove GST from an inclusive price?
Divide the inclusive price by (100 + rate) and multiply by 100. For example, 1,180 ÷ 118 × 100 = 1,000 before 18% GST.
What is the difference between CGST, SGST and IGST?
Within one state, GST is split equally into Central GST and State GST. For sales between states, the full amount is charged as Integrated GST.