GST Calculator (add / remove GST)
Find out how much GST is in a price, for a bill or a purchase. Add GST to a price, or take it out of a GST-inclusive price to see the real base price. CGST and SGST are split for you.
18% GST on ₹10,000 = ₹1,800, total ₹11,800.
How GST is calculated
- Adding GST: GST = amount × rate ÷ 100, total = amount + GST. For example ₹10,000 × 18 ÷ 100 = ₹1,800.
- Removing GST (price already includes it): base = amount × 100 ÷ (100 + rate). For example ₹11,800 × 100 ÷ 118 = ₹10,000.
- For a sale inside your state the GST is split equally into CGST (centre) and SGST (state): 18% = 9% + 9%.
- For a sale to another state the full rate is charged as IGST (18% IGST).
Worked example
An item costs ₹10,000 before GST at 18%. GST is ₹1,800 (CGST ₹900 + SGST ₹900) and the customer pays ₹11,800. The other way round, a GST-inclusive price of ₹11,800 has a base price of ₹10,000.
| Amount | ₹10,000 |
| GST rate | 18% |
| Amount is | Without GST (add GST) |
| Total with GST | ₹11,800 |
| Base price | ₹10,000 |
| GST amount | ₹1,800 |
| CGST | ₹900 |
| SGST | ₹900 |
Formula
CBIC GST rate notifications (GST 2.0, from 22 Sept 2025)
b = Md==1 ? A : A×100/(100+Gr) g = b×Gr/100 Total with GST = b+g Base price = b GST amount = g CGST = g/2 SGST = g/2
Good to know
- Since 22 September 2025 most goods use two main rates, 5% and 18%, with 40% for a few luxury or harmful items.
- Gold and silver carry 3% GST; rough diamonds 0.25%.
- Taking 18% off a GST-inclusive price is wrong: 18% of ₹11,800 is ₹2,124, but the real GST is ₹1,800.
- Confirm your item’s rate by its HSN code with your CA or on the GST portal.
Questions people ask
How do I remove GST from a GST-inclusive price?
GST = total × rate ÷ (100 + rate). For 18%, divide the total by 118 and multiply by 18. Choose “Including GST (remove GST)” above and it is done for you.
What are CGST and SGST?
For a sale within one state, GST is split into two equal parts: CGST goes to the central government and SGST to the state.
When is IGST charged?
When goods or services are sold from one state to another, the full rate is charged as IGST, for example 18% IGST.
What are the current GST rates?
Since 22 September 2025: 5% and 18% for most goods, 40% for a few special items, 3% on gold and 0% on many essential foods.
Can I make a GST bill with it?
Yes. The Quotation / bill maker in the same app makes a GST bill from items, quantity and rate, with a UPI QR you can send on WhatsApp.
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Updated 13 Nov 2026 · Desktop N Calculator v1.2.0