Free calculator · instant results
GST calculator for India
Type an amount, pick the GST rate and see the full tax breakup as you type. Switch between adding GST to a price and working backwards from a GST-inclusive total, and between CGST + SGST for sales within your state and IGST for sales to another state.
How to use the tool
- 1
Choose add or remove
Use “Add GST” when your price excludes tax, or “Remove GST” when the amount already includes it.
- 2
Enter the amount
Type the price in rupees. Commas are fine, and results update with every keystroke.
- 3
Pick the rate
Tap 0.25%, 3%, 5%, 12%, 18% or 28%, or enter a custom rate for your item.
- 4
Select the type of sale
Within your state shows CGST and SGST; to another state shows IGST. Copy the summary for your bill or WhatsApp.
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Turn the numbers into a proper GST invoice
Our free invoice generator adds CGST, SGST or IGST line by line, prints your GSTIN and puts a UPI QR on the bill so customers can pay on the spot.
Make a GST invoice →Frequently asked questions
How do I calculate GST on a price?
Multiply the price before tax by the rate. For ₹1,000 at 18%, GST is ₹180 and the total is ₹1,180. The calculator does this for you and shows the split.
How do I find the GST included in a total amount?
Divide the total by (100 + rate) and multiply by 100 to get the value before tax; the difference is the GST. For ₹1,180 at 18%, the base is ₹1,000 and GST is ₹180.
When do I charge CGST and SGST instead of IGST?
When the seller and the place of supply are in the same state, the tax is split equally into CGST and SGST. For a sale to another state, the whole amount is charged as IGST.
Which GST rate applies to my product or service?
It depends on the HSN or SAC code of what you sell, and rates are revised by the GST Council from time to time. Check the current rate for your item on the CBIC website or with your accountant.
How is the result rounded?
Each tax amount is rounded to the nearest paisa. When you add GST within a state, CGST and SGST are each rounded separately, the way they appear on a tax invoice.
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