Reverse GST Calculator – Remove GST from Price
Find the pre-GST amount from a GST-inclusive price. Free reverse GST calculator for India with CGST, SGST and IGST breakdown.
Tool
Enter your values and get results instantly.
How to Use
- 1Enter the total amount (GST inclusive)\n2. Select the GST rate (5%, 12%, 18% or 28%)\n3. Click Calculate to remove GST\n4. View base price, GST amount and CGST/SGST split\n5. Copy or download the result
Benefits
Frequently Asked Questions
What is reverse GST calculation?
It finds the original price before GST was added. For example, if you paid ₹1,180 for an 18% GST item, the reverse calculation shows ₹1,000 as the base price and ₹180 as the GST.
How is the base amount calculated?
Base amount = Total amount ÷ (1 + GST rate). So for ₹1,180 at 18%, it is 1180 ÷ 1.18 = ₹1,000. The GST portion is the difference between the two.
What is CGST and SGST?
For intra-state (same state) sales, GST is split equally into CGST (Central GST) and SGST (State GST). This calculator shows that 50-50 split automatically.
Does this calculator support IGST?
Yes — for inter-state sales you only need the total GST amount. The IGST is the full GST amount shown, without the CGST/SGST split.
Is it accurate for invoices?
Yes, the calculation matches standard GST invoicing. Always cross-check rounding with your actual invoice if exact paise matters for accounting.