🧾 GST Calculator

Add or remove GST at 5, 12, 18 or 28 percent, with the CGST and SGST split.

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Amount and rate

₹
₹100₹10,00,000
Total with GST
₹11,800
Rate 18%
Net amount ₹10,000
GST ₹1,800
CGST (50%)
₹900
SGST (50%)
₹900

Intra-state split. IGST, cess and reverse charge are not modelled.

GST slabs

5% Essentials — grains, medicines
12% Processed foods, some goods
18% Most goods and services
28% Luxury and demerit items

Pick a slab (5, 12, 18, or 28), an amount between ₹100 and ₹10 lakh, then Add GST (amount is exclusive) or Remove GST (amount already includes tax). The page always splits tax 50/50 into CGST and SGST. There is no IGST switch and no cess field.

The two directions

Add: tax = amount × rate/100, total = amount + tax. Remove: net = amount / (1 + rate/100), tax = amount − net. Subtracting 18% from an inclusive total is the common error this page avoids.

18% on ₹10,000 exclusive

Tax 
₹1,800
Payable 
₹11,800
CGST / SGST 
₹900 each

What invoices still need you to decide

  • Whether the supply is intra-state (CGST+SGST) or inter-state (IGST). This UI always shows the split even if your real invoice should show IGST.
  • Nil, 0.25, 3%, or cess on tobacco / large cars — not offered.
  • Reverse charge, composition, and HSN classification.

Processing

Figures update in the browser. Amounts are not stored on our servers.

GST arithmetic questions

How do I remove GST from an inclusive amount?

Divide the total by one plus the rate as a decimal. For 18 percent GST, divide the total by 1.18. Do not subtract 18 percent from the total, which is the common mistake and gives the wrong answer.

How do I add GST to an amount?

Multiply the base amount by the rate and add it on. At 18 percent, a base of 10,000 attracts 1,800 in GST for a total of 11,800.

What are CGST and SGST?

For a supply within a single state, GST is split equally between CGST, collected by the central government, and SGST, collected by the state. Each takes half the total tax. For a supply between states, a single IGST is charged instead.

Which GST rate applies to my product?

Rate classification depends on the GST schedules for your specific goods or service. This calculator applies whichever of the four main slabs you select; it cannot determine the correct slab for you.

Does this calculator handle IGST or cess?

No. The split shown assumes an intra-state supply, so IGST is not modelled, and compensation cess on items such as tobacco or large vehicles is not included.

Can I enter a custom GST rate?

No. Only the four main slabs of 5, 12, 18 and 28 percent are available on this page.

If the tax sits on a loan or deposit

EMI and FD pages do not add GST automatically: EMI Calculator, FD/RD Calculator, SIP Calculator. Browse the full Finance & Date set or the all tools hub.