100% Free Online Calculator

Online GST Calculator (Exclusive & Inclusive)

Quickly calculate GST amounts, CGST, SGST, and IGST splits across all Indian tax slabs (0%, 5%, 12%, 18%, 28%).

Calculation Mode

Base / Net Amount (₹)

₹

GST Slab Rate

Place of Supply (Tax Split)

Tax Calculation ResultsSlab: 18%

Net / Base Amount₹10,000

Total GST Amount+ ₹1,800

Central GST (CGST @ 9%)₹900

State GST (SGST @ 9%)₹900

Final Total Amount(Base Value + Total GST)

₹11,800

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How GST is Calculated: Formulas & Examples

Goods and Services Tax (GST) calculation depends on whether the price is Exclusive of tax (tax needs to be added) or Inclusive of tax (tax is already included in the retail selling price).

1. Formula for GST Exclusive:

GST Amount = (Base Amount × GST %) ÷ 100
Total Amount = Base Amount + GST Amount

Example: For an item worth ₹1,000 with 18% GST: GST = (1000 × 18) ÷ 100 = ₹180. Total Bill = ₹1,180.

2. Formula for GST Inclusive:

Base Value = (Total Amount × 100) ÷ (100 + GST %)
GST Amount = Total Amount - Base Value

Example: For an MRP item of ₹1,180 with 18% GST: Base = (1180 × 100) ÷ 118 = ₹1,000. GST = ₹180.

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GST calculator questions

How is GST calculated on goods and services in India?

For GST Exclusive prices: GST Amount = (Base Amount × GST %) ÷ 100, and Total Amount = Base Amount + GST Amount. For GST Inclusive prices: Base Value = (Total Amount × 100) ÷ (100 + GST %), and GST Amount = Total Amount - Base Value.

What is the difference between CGST, SGST, and IGST?

For Intra-state transactions (within the same state), GST is split equally into Central GST (CGST) and State GST (SGST). For Inter-state transactions (between different states), Integrated GST (IGST) is charged entirely by the central government.

Can I copy or export the GST calculation result?

Yes, you can click "Copy Calculation" to copy the complete tax split breakdown or click "Generate Invoice" to immediately create a full GST tax invoice.

About this free gst calculator

Calculate inclusive or exclusive GST and view CGST, SGST and IGST amounts. No account is required. Entries are not saved when you leave or refresh this page.

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