GST Calculator India
Calculate tax amounts and total invoice values instantly.
Calculations follow standard Indian GST rules. Verify your applicable HSN/SAC slab rate prior to billing.
GST (Goods and Services Tax)
GST (Goods and Services Tax) is a single, unified indirect tax levied on the supply of goods and services across India. Introduced on 1st July 2017, GST replaced a long list of earlier indirect taxes — VAT, service tax, excise duty, and more — bringing one common tax framework for the entire country.
Under the GST 2.0 update, goods and services fall under four main slabs — 0%, 5%, 18%, and 40% — depending on category. Some essential goods and services remain fully exempt from GST.
For businesses, calculating GST correctly is essential when preparing quotations, invoices, bills, and other transaction records.
How to Calculate GST Using This Calculator
Using Virva Book's online GST Calculator takes only a few seconds.
- Exclusive (Before GST) – GST needs to be added on top of this amount.
- Inclusive (After GST) – GST is already included, and the calculator will extract the tax from it.
- Actual Amount – the base price before tax
- Total GST Applicable – the tax amount
- Total Invoice Amount – the final payable/billable value
GST Calculation Formula
Understanding the basic GST formula can help you verify the result generated by the calculator.
GST Calculation for an Exclusive Amount
When the price does not include GST:
Total Amount = Taxable Amount + GST Amount
Example: Taxable Amount = ₹10,000, GST Rate = 18%
→ GST = ₹1,800
→ Total Amount = ₹11,800
GST Calculation for an Inclusive Amount
When the quoted price already includes GST:
Taxable Amount = Inclusive Amount − GST Amount
Example: Inclusive Amount = ₹11,800, GST Rate = 18%
→ GST Amount = ₹1,800
→ Taxable Amount = ₹10,000
This makes it easy to determine exactly how much GST is hidden inside a final selling price.
Types of GST in India: CGST, SGST, IGST & UTGST Explained
CGST — Central Goods and Services Tax
CGST is the tax collected by the Central Government on the intra-state supply of goods and services — that is, when a transaction happens within the same state. It is governed by the CGST Act and is always charged together with SGST, with both rates usually kept equal.
SGST — State Goods and Services Tax
SGST is the tax collected by the respective State Government on intra-state supply of goods and services. It is governed by the SGST Act of that state and is charged alongside CGST on the same transaction, with both components typically set at equal rates.
IGST — Integrated Goods and Services Tax
IGST applies to inter state supply of goods and services, as well as imports into India. It is collected by the Central Government, which then distributes the collected amount among the respective states involved in the transaction.
UTGST — Union Territory Goods and Services Tax
UTGST applies to the supply of goods and services within India's Union Territories. It is collected along with CGST and functions similarly to SGST, but specifically for transactions taking place in Union Territory regions.
Looking for something beyond just calculating GST?
Virva Books helps you create GST invoices, know your tax liability, and file your tax returns directly. Keep your business GST compliant, all year long with GST accounting software - Virva Books.