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GST Calculator

Calculate GST amount with CGST/SGST or IGST split. Supports exclusive and inclusive pricing.

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How to use this calculator
  1. 1

    Enter amount

    Enter the base amount (GST exclusive) or total amount (GST inclusive).

  2. 2

    Select GST rate

    Choose from standard GST rates: 5%, 12%, 18%, or 28%.

  3. 3

    Choose pricing type and supply type

    Toggle GST inclusive/exclusive and intra-state (CGST+SGST) or inter-state (IGST).

₹

GST breakdown

Taxable amount₹ 10,000.00
GST @ 18%₹ 1,800.00
CGST @ 9%₹ 900.00
SGST @ 9%₹ 900.00
Total amount₹ 11,800.00

CGST + SGST applies for intra-state supply. IGST applies for inter-state supply. This tool is for estimation only.

Quick answer

Enter amount and GST rate to see instant CGST/SGST or IGST breakup. Supports both inclusive and exclusive pricing.

GST (Goods and Services Tax) is India's unified indirect tax system. Every business transaction involves GST calculation—whether you're invoicing a client, purchasing inventory, or filing returns. The four standard GST rates are 5%, 12%, 18%, and 28%, with the tax split between CGST+SGST (intra-state) or IGST (inter-state).

What is this calculator?

A GST Calculator helps you compute the GST amount on any transaction. Enter the amount and GST rate, and the calculator shows the taxable value, GST amount, CGST/SGST or IGST split, and total amount. It supports both exclusive (add GST on top) and inclusive (extract GST from total) calculations.

Formula

GST Exclusive (add GST):
• GST Amount = Base Amount × GST Rate / 100
• Total = Base Amount + GST Amount

GST Inclusive (extract GST):
• Taxable Amount = Total Amount / (1 + GST Rate / 100)
• GST Amount = Total Amount − Taxable Amount

For intra-state: CGST = SGST = GST Amount / 2
For inter-state: IGST = GST Amount

Example

Product worth ₹10,000 with 18% GST (intra-state): • Taxable amount: ₹10,000 • CGST @ 9%: ₹900 • SGST @ 9%: ₹900 • Total GST: ₹1,800 • Total amount: ₹11,800 If the same ₹11,800 is the inclusive price: • Taxable amount: ₹10,000 • GST: ₹1,800

Scenario snapshots

Invoice preparation

Calculate GST before generating a GST invoice for your client.

MRP back-calculation

Extract taxable value from an inclusive MRP to understand the pre-tax cost.

Decision guide

Choose this when

  • ✓You need to calculate GST on a transaction before invoicing.
  • ✓You want to extract the taxable value from a GST-inclusive price.
  • ✓You need CGST/SGST vs IGST breakup for accounting.

Pick another route when

  • •You need to calculate GST for composition scheme dealers (different rules).
  • •You need HSN-wise multi-rate calculation for a complex invoice.
  • •You need GSTR filing assistance—use government portal or accounting software.

Common mistakes to avoid

  • !Applying CGST+SGST on inter-state transactions (should be IGST).
  • !Confusing inclusive and exclusive pricing when quoting to clients.
  • !Using wrong GST rate for a product category—check HSN code rates.

Assumptions and disclaimers

Updated context: FY 2026

  • •Standard GST rates (5%, 12%, 18%, 28%) are supported.
  • •CESS is not included in this calculator.
  • •For composition scheme, consult your CA.

In practice (India)

GST calculator is searched by small business owners, accountants, and freelancers who need quick tax breakdowns before invoicing. This tool pairs naturally with our GST Invoice Generator—calculate the tax, then generate the invoice.

For businesses with inter-state transactions, the IGST toggle helps verify tax amounts before filing GSTR-1 and GSTR-3B.

Benefits

  • ✓Instant CGST/SGST/IGST breakup for any amount and rate.
  • ✓Toggle between inclusive and exclusive pricing with one click.
  • ✓Useful for invoice preparation, billing, and quick tax verification.
  • ✓Pairs with the RealBill GST Invoice Generator for complete workflow.

Related calculators and guides

Frequently Asked Questions

What is the difference between CGST, SGST, and IGST?
CGST (Central GST) and SGST (State GST) are charged on intra-state (within same state) transactions, each at half the GST rate. IGST (Integrated GST) is charged on inter-state transactions at the full GST rate. Total tax amount remains the same.
How do I know if my transaction is intra-state or inter-state?
Compare the place of supply with the supplier's state. Same state = intra-state (CGST+SGST). Different states = inter-state (IGST). For services, place of supply rules under GST Act apply.
Which GST rate applies to my product?
GST rates depend on the HSN (Harmonised System of Nomenclature) code of the product. Common rates: 5% (essential goods), 12% (processed food, mobile phones), 18% (most services, electronics), 28% (luxury goods, cars). Check the GST rate finder on the CBIC website.
Is GST applicable on exports?
Exports are zero-rated under GST. You can either export under LUT (Letter of Undertaking) without paying IGST, or pay IGST and claim refund.
What is reverse charge under GST?
Under reverse charge mechanism (RCM), the recipient pays GST instead of the supplier. This applies to certain services like legal fees, GTA services, and purchases from unregistered dealers above ₹5,000/day.

This calculator provides estimates for standard GST rates. For composition scheme, reverse charge, or CESS calculations, consult a qualified CA or use the government GST portal.