How do I add GST to an amount?

GST = amount × rate ÷ 100, and the total = amount + GST. For example, ₹10,000 at 18% adds ₹1,800 GST for a ₹11,800 total.

How do I remove GST from a GST-inclusive price?

Base amount = total ÷ (1 + rate ÷ 100). The GST portion is the total minus the base amount.

What is the CGST/SGST split?

For intra-state supplies, GST is split equally into Central GST (CGST) and State GST (SGST) — each is half of the total GST.

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GST Calculator

Add or remove GST with CGST/SGST split for Indian tax rates.

Amount

GST rate (%)

Base amount

₹10,000

GST

₹1,800

Total amount

₹11,800

CGST / SGST split

CGST (9%): ₹900SGST (9%): ₹900

This calculator provides estimates only and is not tax or financial advice. Verify applicable rates and rules with a qualified professional.

About the GST calculator

Goods and Services Tax (GST) in India applies at standard slabs of 5%, 12%, 18%, and 28%. This calculator works in both directions: add GST to a base price, or remove GST from a tax-inclusive price to find the base amount.

For intra-state transactions, the GST is split equally between CGST and SGST — both shown above.

Frequently asked questions

How do I add GST to an amount?: GST = amount × rate ÷ 100, and the total = amount + GST. For example, ₹10,000 at 18% adds ₹1,800 GST for a ₹11,800 total.
How do I remove GST from a GST-inclusive price?: Base amount = total ÷ (1 + rate ÷ 100). The GST portion is the total minus the base amount.
What is the CGST/SGST split?: For intra-state supplies, GST is split equally into Central GST (CGST) and State GST (SGST) — each is half of the total GST.