Add GST
Multiply the taxable value by the selected rate, then add the tax to the taxable value.
FREE GST CALCULATOR
Free GST Calculator
Use this free GST calculator to add or remove GST, estimate tax-inclusive prices and split intra-state CGST and SGST or inter-state IGST.
FREE TO USE INSTANT RESULTS BROWSER-BASED
01 / GST CALCULATION
Enter an amount and tax rate
Calculate GST-exclusive or GST-inclusive prices and display the tax split.
Taxable value—
GST amount—
Final / inclusive amount—
CGST—
SGST—
IGST—
Important GST rate note
The correct rate depends on the goods or service, HSN/SAC classification and latest applicable notification. Preset choices are calculation inputs, not a classification guide. Confirm the rate on the official CBIC GST rates page or with a qualified tax professional before issuing an invoice.
HOW IT WORKS
Add or remove GST from a price
Calculate the tax amount and total price from a taxable value, or work backwards from a GST-inclusive price to estimate its pre-tax value.
Remove GST
Divide an inclusive amount by one plus the rate expressed as a decimal to estimate the taxable value.
Tax split
For intra-state supplies, this calculator splits the entered total rate equally into CGST and SGST. For inter-state supplies, it shows IGST.
FREE GST CALCULATOR
Add or remove GST from a price
Calculate the tax amount and total price from a taxable value, or work backwards from a GST-inclusive price to estimate its pre-tax value.
Enter the price
Choose whether the amount is before GST or already includes GST, then enter the amount.
Select the applicable GST rate
Choose a rate or enter a custom percentage. Confirm the correct classification and rate for the specific HSN or service.
Choose the supply type and review
Select intra-state or inter-state to see the relevant CGST and SGST split or IGST amount alongside the total.
For an intra-state supply, displayed tax is split equally into CGST and SGST. For an inter-state supply, the calculator displays the full rate as IGST. The correct rate depends on the specific goods or service and applicable GST notifications.
GST Calculator FAQs
How do I add GST to a price?
Multiply the taxable value by the GST rate divided by 100 to find the tax, then add the tax to the taxable value.
How do I remove GST from an inclusive price?
Divide the GST-inclusive amount by one plus the GST rate divided by 100. The difference between the inclusive amount and the result is the tax component.
Which GST rate should I use?
GST rates depend on the item's HSN classification or the service classification and current notifications. Check the applicable rate with official CBIC resources or a qualified tax professional.