Free Online GST Calculator
Instantly calculate inclusive or exclusive Goods and Services Tax for your invoices. Fast, accurate, and updated for FY 2026-27.
Net Amount
₹ 0.00
Total GST
CGST: ₹ 0.00 | SGST: ₹ 0.00
₹ 0.00
Gross Amount (Total)
₹ 0.00
How to Calculate GST
Understand the math behind inclusive and exclusive GST computations to stay compliant.
Adding GST (Exclusive)
When the price does not include GST. We simply apply the percentage on top of the original cost to get the final price.
GST Amount = (Original Cost × GST Rate) / 100
Net Price = Original Cost + GST Amount
Removing GST (Inclusive)
When the price already includes GST. We reverse-calculate to find the product's base price and the tax component.
GST Amount = Original Cost - [Original Cost × {100 / (100 + GST Rate)}]
Net Price = Original Cost - GST Amount
Frequently Asked Questions
What is the difference between CGST, SGST, and IGST?
CGST (Central GST) and SGST (State GST) apply to intra-state sales (within the same state), where the tax revenue is divided equally between the Central and State governments. IGST (Integrated GST) applies to inter-state sales (between two different states) and imports/exports, collected entirely by the Central government before being apportioned.
How do I know which GST rate applies to my product (HSN)?
Every product or service corresponds to a specific HSN (Harmonized System of Nomenclature) or SAC (Services Accounting Code) under the GST regime. The appropriate tax rate (0%, 5%, 12%, 18%, or 28%) depends directly on that designated HSN/SAC code. You should consult the official CBIC GST rate schedule or a tax professional for accurate classification.
Is it mandatory to show CGST and SGST separately on the invoice?
Yes, for local (intra-state) business transactions, it is a strict legal requirement under GST rules to clearly bifurcate and display the CGST and SGST amounts separately on the tax invoice. Simply showing an aggregate "GST" amount without this breakdown violates compliance norms.
Need Help with Complex GST Rates or Filing?
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