GST Formula Reference
Adding GST
GST amount = Base price × GST%
Total amount = Base price + GST amount
Removing GST
Base price = Inclusive amount ÷ (1 + GST%)
GST amount = Inclusive amount − Base price
Base Amount
₹25,000
GST
₹3,000
AI Result Summary
AI ActiveGST is being added on the entered value
At 12% GST, ₹25,000 becomes a total invoice value of ₹28,000.
Key takeaway
Estimated GST amount is ₹3,000, split roughly into CGST ₹1,500 and SGST ₹1,500 for an intra-state example.
Base Amount
₹25,000
before GST
GST Amount
₹3,000
12% tax
Post-GST Amount
₹28,000
invoice total
CGST / SGST
₹1,500 / ₹1,500
equal split example
What is GST?
Goods and Services Tax is an indirect tax applied to goods and services in India. This calculator helps estimate GST quickly whether you start from a tax-exclusive amount or a GST-inclusive amount.
How to use this GST Calculator
- Enter realistic values based on your current plan or trade setup.
- Review the output metrics, not just the headline number.
- Run multiple scenarios to compare best/base/worst cases.
Practical tips
- Check whether a quoted value is GST-inclusive or GST-exclusive before calculating.
- Use the closest applicable GST slab for a quick estimate.
- Review CGST and SGST split separately if you need invoice-level clarity.
Model assumptions
- This calculator uses a simple GST rate on the entered amount.
- CGST and SGST are shown as an equal split for illustration.
- Product classification and special cases are not validated here.
This calculator is for estimation purposes only. Confirm the applicable GST slab and invoicing treatment before filing or billing.