GST Calculator
Calculate GST online in India. Add or remove GST and instantly view your taxable amount, tax breakdown and final price.
Calculate your GST
Enter an amount, select a GST rate or set your own custom rate.
This calculator provides an estimate for general use. Confirm the applicable GST rate and tax treatment with official guidance or a qualified tax professional.
How to use the GST calculator
Use this free GST calculator to work out the Goods and Services Tax on a price in India. Enter the amount, choose whether to add GST to a base price or remove GST from a GST-inclusive price, then select a rate. You can also choose Custom (%) and enter any rate from 0 to 100.
GST calculation formulas
GST-exclusive amount: GST = Base amount × GST rate ÷ 100. Final amount = Base amount + GST.
GST-inclusive amount: Taxable amount = Inclusive amount × 100 ÷ (100 + GST rate). GST = Inclusive amount − Taxable amount.
CGST, SGST and IGST
For an intra-state supply, GST is generally split equally into Central GST (CGST) and State GST (SGST). For an inter-state supply, Integrated GST (IGST) is generally applied. Select the relevant option to see the estimated tax split.
Common GST rates
Common selectable rates in this calculator are 0%, 5%, 12%, 18% and 28%. The Custom option lets you enter another percentage when needed. Actual rates depend on the goods or services and applicable rules.
Frequently asked questions
How do I calculate GST on an amount?
For an amount before GST, multiply it by the GST rate and divide by 100. Add that tax to the base amount to get the total.
How do I remove GST from a total price?
Select “Remove GST (inclusive)”. The calculator divides the inclusive amount by (100 + GST rate) and multiplies by 100 to find the taxable amount.
Can I enter a custom GST rate?
Yes. Select “Custom (%)” and enter a rate between 0 and 100, including decimal rates such as 7.5%.
How are CGST and SGST calculated?
For an intra-state supply, the selected GST rate is generally divided equally between CGST and SGST. For example, an 18% rate is shown as 9% CGST and 9% SGST.
When should I select IGST?
Select IGST for an inter-state supply where integrated GST applies. Confirm the place-of-supply rules for your transaction.
Which GST rates are available?
The quick choices are 0%, 5%, 12%, 18% and 28%. You can also use the custom rate field.
Is this GST calculator free?
Yes. The JIOPDF GST calculator is free to use in your browser.
Is the GST result an official tax invoice?
No. It is an estimate only and does not create a tax invoice or replace professional tax advice.