Menu

Free GST calculation tool

Add GST or reverse-calculate GST instantly.

Calculate GST on a taxable value or extract GST from a tax-inclusive total. Split CGST, SGST and IGST in one compact workspace.

Forward GST calculation Reverse GST calculation CGST, SGST and IGST split
Use the applicable GST rate for your exact goods or services. Classification, exemptions and place-of-supply rules should be verified separately.
GST calculator

Calculate tax and invoice value

Instant calculation
Forward GST

Enter the taxable amount

The calculator will add GST to the amount entered below.

Select GST rate Common slabs
Formula: GST = Taxable value × GST rate ÷ 100
Tip: Reverse GST is useful when a quoted price already includes tax. Currency format: Indian Rupees

Calculate GST forward or work backwards from a tax-inclusive amount.

A forward GST calculation starts with the taxable value and adds the applicable GST. A reverse GST calculation starts with the GST-inclusive total and extracts both the original taxable value and the included tax. This is useful for invoices, quotations, retail pricing, reconciliation and checking tax-inclusive vendor bills.

Forward calculation

Add GST to a base value

Enter the taxable amount, choose the rate and calculate the final invoice value.

Reverse calculation

Extract GST from a total

Enter a GST-inclusive amount and recover the taxable value and included GST.

Intrastate supply

Split CGST and SGST

For eligible intrastate supplies, the GST amount is shown as equal central and state portions.

Interstate supply

Calculate IGST

Switch the supply type to show the applicable GST amount as IGST.

Frequently asked questions

Multiply the taxable value by the GST rate and divide by 100. Add the GST amount to the taxable value to obtain the GST-inclusive invoice total.

Divide the GST-inclusive total by one plus the GST rate expressed as a decimal. The result is the taxable value. Subtract that amount from the total to identify the included GST.

IGST is generally associated with interstate supplies. Place-of-supply rules can be more complex than the physical location of the parties, so the correct tax treatment should be verified.

WhatsApp
Start with clarity

Tell us what you're building. We'll map the legal, tax, and compliance steps.

Share your business stage and we will help you understand the registration, GST, license, accounting, payroll, and compliance requirements.

  • Understand the right business structure before registering.
  • Identify GST, FSSAI, IEC, trademark, and shop license needs.
  • Plan accounting, payroll, MCA, ROC, and annual compliance early.