Free GST calculator
Add GST to net prices or remove GST from inclusive amounts in seconds. Live breakdowns for CGST, SGST, and IGST using current September 2025 tax rates.
Calculate GST
Enter an amount and select current GST slabs
Current slabs under the September 2025 GST rate revision.
Calculation summary
Live tax breakdown
Opens the free invoice maker with this amount and tax rate filled.
Frequently asked questions
Plain answers about GST calculations and tax splits
How do I add GST to an amount?
To add GST to a price that excludes tax, multiply the net amount by the GST rate (e.g. 18%) and divide by 100. Adding this calculated tax to your net amount gives the total price payable.
How do I remove GST from an amount?
To remove GST from a tax-inclusive price, divide the total by (1 + GST rate / 100). That gives the taxable value before GST. The difference between the total and taxable value is the tax amount.
What is the difference between CGST/SGST and IGST?
When you supply goods or services within the same state (intra-state supply), GST splits equally into Central GST (CGST) and State GST (SGST). When supplying to another state (inter-state supply), the entire tax is levied as Integrated GST (IGST).
Which GST rates exist now?
Following the September 2025 GST rate rationalisation, standard rates are 0%, 5%, 18%, and 40%. Some essential items are taxed at 0% or 5%, most commercial goods and services are at 18%, and demerit goods are at 40%.
What does 'inclusive' mean?
An inclusive price already includes the GST amount in the figure shown to the customer. For example, a ₹1,180 item at 18% inclusive GST has a taxable value of ₹1,000 and ₹180 GST.
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