GST Calculator
Extract base prices from billed amounts or add tax to your original value instantly.
Tip: Change one assumption at a time and compare result deltas before making pricing or hiring decisions.
GST Breakdown
Enter the amount and rate, then click calculate to view the CGST/SGST split.
Use the GST calculator when you need to add tax to a base value or extract the tax included inside a billed amount. It is useful for pricing, invoice verification, and understanding the pre-tax value behind GST-inclusive totals.
1. Choose add or remove GST
Use add mode when you know the base price, or remove mode when you only know the final billed amount.
2. Enter the amount and GST slab
Input the relevant value and select the correct GST rate, such as 5%, 12%, 18%, or 28%.
3. Review the split
Check the base amount, tax amount, and final total so you can validate invoice math quickly.
4. Use reverse mode for inclusive pricing
If the amount already includes GST, reverse calculation helps you identify the actual taxable value and embedded tax.
What is the difference between CGST, SGST, and IGST?
CGST and SGST apply to intra-state sales and split the total tax equally, while IGST applies to inter-state sales and imports.
What are the common GST slabs in India?
The most common slabs are 5%, 12%, 18%, and 28%, with some goods and services exempt or taxed at 0%.
Why would I need to extract GST from a billed amount?
Reverse calculation helps businesses and buyers understand how much of an inclusive price is tax and how much is the actual pre-tax value.
Does this calculator work for both pricing and invoice checks?
Yes. You can use it either to set a final selling price from a base value or to verify whether an inclusive invoice amount is correct.