GST Calculator: Add or Remove GST

Add GST to a price, or take it out of a GST-inclusive amount, with the CGST/SGST or IGST split for your invoice.

GST Calculator

Add GST to a price or remove GST from an inclusive price, with the CGST, SGST and IGST split.

Total price incl. GST₹11,800.00

Price before GST: ₹10,000.00
Total GST: ₹1,800.00
CGST (9%): ₹900.00
SGST / UTGST (9%): ₹900.00
Price incl. GST: ₹11,800.00

Rates as of 01-10-2026. Rates change – confirm with your bank or the official notification.

Results are estimates for educational purposes only and are not financial, tax or legal advice. For more details, do consult a lawyer or a subject-matter expert.

Price vs GST

Price before GSTGST

View chart data as a table

Price vs GST
Price before GST	₹10,000.00
GST	₹1,800.00

Explain this result

Adding GST: GST = price × rate ÷ 100, total = price + GST.

Removing GST: price before GST = inclusive price × 100 ÷ (100 + rate), GST = inclusive price − price before GST.

At 18%: price before GST ₹10,000.00 + GST ₹1,800.00 = ₹11,800.00. Within a state the GST is split equally into CGST and SGST (9% each); on inter-state sales the full 18% is IGST.

Frequently asked questions

How do I remove GST from a price?

Divide the GST-inclusive price by (1 + rate/100). For ₹11,800 at 18%: 11,800 ÷ 1.18 = ₹10,000 before GST, so the GST is ₹1,800.

When is IGST charged instead of CGST and SGST?

IGST applies when the supplier and the place of supply are in different states (inter-state). Within one state, CGST and SGST are charged in equal halves.

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<iframe id="ss-embed-gst" src="https://sumsense.in/sumsense-embed/gst/" title="GST Calculator" width="100%" height="900" style="border:0;max-width:100%" loading="lazy"></iframe>
<p style="font-size:13px"><a href="https://sumsense.in/calculators/gst-calculator/">GST Calculator</a> – Free calculator by SumSense</p>
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Worked example

A service worth ₹10,000 at 18%: GST is ₹1,800, invoice total ₹11,800. Within the same state that is CGST ₹900 + SGST ₹900; to another state it is IGST ₹1,800.

Formulas

Add GST: GST = amount × rate ÷ 100.
Remove GST: base = amount × 100 ÷ (100 + rate).

Tips

GST rates were restructured from 22 September 2025. Check your item’s current rate on the CBIC website.
Your invoice must show your GSTIN, HSN/SAC code and the tax split.
Customer not paying? See tools for recovering dues.