GST Remove Calculator
Enter a GST-inclusive price to find the original taxable amount and the exact GST that was charged.
Remove GST from a Total
How to Remove GST from a Price
When a price already includes GST, divide it by (1 + rate ÷ 100) to find the original taxable value, then subtract that from the total to see the GST portion.
Formula: Original Amount = Total × 100 ÷ (100 + Rate) · GST Amount = Total − Original Amount
Worked Example
A shopkeeper receives ₹11,800 for an item that included 18% GST.
| Total Received | GST Rate | GST Portion | Original Price |
|---|---|---|---|
| ₹11,800 | 18% | ₹1,800 | ₹10,000 |
| ₹1,050 | 5% | ₹50 | ₹1,000 |
| ₹1,280 | 28% | ₹280 | ₹1,000 |
Frequently Asked Questions
Because the GST rate applies to the original amount, not the total. Subtracting 18% of the total would overstate the tax, so the calculator divides by (1 + rate ÷ 100) instead.
Yes — removing GST and reverse-calculating GST both start from a GST-inclusive amount. See our dedicated Reverse GST Calculator for the same workflow with an invoice-style layout.