GST Calculator

Quickly add GST to a price, or find the original price and tax from a GST-inclusive amount. The calculator also shows the CGST and SGST split used for sales within the same state.

Result

Total amount (with GST) —
Amount before GST —
GST amount —
CGST + SGST (each) —

How to use

  1. Enter the amount.
  2. Enter the GST rate (for example 5% or 18%).
  3. Choose whether to add GST or remove GST.
  4. See the amount before tax, the GST amount and the total.

Formula

Add GST: GST = Amount × Rate ÷ 100
Remove GST: Original amount = Amount × 100 ÷ (100 + Rate)

Frequently asked questions

What are CGST and SGST?

For a sale within one state, GST is split equally into Central GST (CGST) and State GST (SGST). For a sale between two states, the full amount is charged as IGST.

Which GST rate should I use?

The rate depends on the product or service. Since September 2025 most goods and services fall under the 5% or 18% slabs, with a higher rate for some luxury and sin goods. Check the official GST rate list for your item.

What does "remove GST" mean?

Use it when the price you have already includes GST, such as an MRP. It tells you the original price and how much of it is tax.

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