How is GST calculated on an exclusive amount?

For a GST-exclusive amount, GST is calculated as taxable value multiplied by the GST rate divided by 100. The final invoice value is taxable value plus GST amount.

How do I calculate GST from an inclusive amount?

For a GST-inclusive amount, taxable value is calculated by dividing the total amount by one plus the GST rate divided by 100. GST amount is the total amount minus taxable value.

When should I use CGST and SGST instead of IGST?

Use CGST and SGST for intra-state supplies, where supplier and buyer are in the same state. Use IGST for inter-state supplies.

Free GST calculator

GST Calculator for Indian invoices and bills

Calculate GST-inclusive and GST-exclusive values, then split the tax as CGST/SGST or IGST for your invoice.

Enter values

Use common GST rates or enter a custom percentage.

Amount

Rs.

Calculation type

GST rate

Supply type

GST breakdown

GST added to taxable value

Rate

18%

Taxable valueRs. 10,000.00

GST amountRs. 1,800.00

CGSTRs. 900.00

SGSTRs. 900.00

IGSTRs. 0.00

Final amountRs. 11,800.00

Create invoice

Rates can vary by HSN/SAC, notification, and supply type. Use this as a quick working estimate before preparing final GST documents.

Try a quick example

Load a sample calculation and adjust it for your invoice.

Invoice management

Formula guide

How the calculation works

GST-exclusive mode starts with the taxable value. GST-inclusive mode works backwards from the final bill amount.

Add GST

GST amount = taxable value x GST rate / 100. Final amount = taxable value + GST amount.

Remove GST

Taxable value = total amount / (1 + GST rate / 100). GST amount = total amount - taxable value.

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