GST calculator
Add GST to a price, or take GST out of a total. See CGST + SGST or IGST at once.
Main rates since 22 Sept 2025: 5 %, 18 % and 40 %; 12 % and 28 % are older rates (CBIC rate notifications of 17 Sept 2025, checked 30 Oct 2026). CGST and SGST are each rounded to the paisa. Nothing you type is stored or sent.
GST formulas
Add GST
GST = price × rate / 100
Total = price + GST
₹ 10,000 at 18 % → GST ₹ 1,800, total ₹ 11,800.
Remove GST
Price = total × 100 / (100 + rate)
GST = total - price
₹ 11,800 incl. 18 % → price ₹ 10,000, GST ₹ 1,800.
CGST + SGST or IGST?
| Sale | Tax | ₹ 10,000 at 18 % |
|---|---|---|
| Inside your state | CGST 9 % + SGST 9 % | ₹ 900 + ₹ 900 |
| To another state | IGST 18 % | ₹ 1,800 |
Make the invoice too
Got the numbers? Put them on a proper bill with the free GST invoice format. Billing every day? Bizznify does this math on every invoice and keeps your stock and accounts up to date.
Questions, answered.
How do I add GST to a price?
GST amount = price x rate / 100. Total = price + GST. Example: ₹ 10,000 at 18 % = ₹ 1,800 GST, total ₹ 11,800.
How do I remove GST from a total (inclusive price)?
Price without GST = total x 100 / (100 + rate). Example: ₹ 11,800 including 18 % GST = ₹ 10,000 + ₹ 1,800 GST.
When is it CGST + SGST and when IGST?
A sale inside your own state has CGST + SGST, each half of the rate. A sale to another state has one IGST at the full rate.
What are the GST rates?
Since 22 September 2025 most goods and services use 5 % or 18 %, with 40 % for a few items and special rates for some (for example 3 % on gold). Older invoices may show 12 % or 28 %. Source: CBIC rate notifications of 17 September 2025 (checked 30 October 2026). Check the rate for your HSN code.
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