GST Calculator
Add GST to a taxable amount or extract GST from an inclusive amount, with CGST/SGST split and common Indian GST rates.
About this gst calculator
This India GST calculator handles both exclusive and inclusive values. For intra-state examples it also shows an equal CGST and SGST split.
What this GST calculator shows
Enter an amount and GST rate, then choose whether the amount is GST-exclusive or GST-inclusive. The result separates the base value and tax amount; for an intra-state example it also shows the equal CGST and SGST split.
Use it for: quick quotation checks, invoice maths, price comparisons and extracting GST from a tax-inclusive amount. It is a calculator, not a GST registration or filing service, so confirm the applicable tax rate and place-of-supply treatment for the actual transaction.
How to use Gst Calculator
- Enter the amount, choose the GST rate and choose whether the amount is GST exclusive or inclusive.
- Calculate taxable value, total GST, final total and equal CGST/SGST shares.
- Confirm whether the supply should use CGST/SGST or IGST and verify the applicable rate before invoicing.
Frequently asked questions
Is GST Calculator free?
Yes. Divya Tools can be used without creating an account.
Does GST Calculator work on mobile?
Yes. The interface is responsive and works in current mobile and desktop browsers.
Are the results official?
No. The tool provides a practical calculation or format check. For regulated, tax or legal use, confirm the latest official rules or portal data.
Editorial note: This page was manually reviewed on 16 September 2026 for tool behaviour, examples and limitations.
GST exclusive and GST inclusive are different calculations
When a price is GST-exclusive, tax is added on top of the taxable value. At 18%, a taxable value of ₹10,000 gives ₹1,800 GST and a final amount of ₹11,800. When ₹11,800 is already GST-inclusive, you cannot simply subtract 18% of ₹11,800. The tax component is extracted using the fraction 18/118, which returns ₹1,800 and a taxable value of ₹10,000.
CGST/SGST versus IGST
For a typical intra-state supply, the GST amount is split equally between CGST and SGST. An 18% rate is usually shown as 9% CGST plus 9% SGST. Inter-state supplies generally use IGST instead. The correct treatment depends on the place-of-supply rules and the actual transaction, so this tool shows the arithmetic but does not determine legal classification.
Worked quotation check
Suppose a quotation has a taxable value of ₹1,62,000 at 18% GST. Total GST is ₹29,160 and the tax-inclusive total is ₹1,91,160. For an intra-state example, CGST is ₹14,580 and SGST is ₹14,580. For an inter-state example, the same ₹29,160 would normally appear as IGST instead of a CGST/SGST split.
Use the correct rate
GST rates can depend on the exact HSN/SAC classification, product description, exemptions and notifications. Do not choose a rate only because a similar product used it previously. For regulated or high-value transactions, verify the current classification and applicable notification on official GST/CBIC sources or with a qualified tax professional.