GST Calculator
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What is a GST Calculator?
A GST (Goods and Services Tax) Calculator helps individuals and businesses quickly compute the tax component of any transaction. It works in two directions: you can add GST to a base price to find the final (inclusive) amount a customer pays, or you can remove GST from a GST-inclusive price to find the original pre-tax amount.
This tool supports all the standard Indian GST slabs — 5%, 12%, 18%, and 28% — as well as a custom rate input for any other percentage.
How the Calculations Work
Adding GST (Exclusive to Inclusive):
GST Amount = Original Amount × (GST Rate / 100)
Final Amount = Original Amount + GST Amount
Final Amount = Original Amount + GST Amount
Removing GST (Inclusive to Exclusive):
Original (Base) Amount = Inclusive Amount / (1 + GST Rate / 100)
GST Amount = Inclusive Amount − Original Amount
GST Amount = Inclusive Amount − Original Amount
Example Calculations
Add GST — Base price: ₹10,000 @ 18%
GST Amount: ₹10,000 × 18% = ₹1,800
Final Amount: ₹10,000 + ₹1,800 = ₹11,800
Remove GST — Inclusive price: ₹11,800 @ 18%
Base Amount: ₹11,800 / 1.18 = ₹10,000
GST Amount: ₹11,800 − ₹10,000 = ₹1,800
GST Amount: ₹10,000 × 18% = ₹1,800
Final Amount: ₹10,000 + ₹1,800 = ₹11,800
Remove GST — Inclusive price: ₹11,800 @ 18%
Base Amount: ₹11,800 / 1.18 = ₹10,000
GST Amount: ₹11,800 − ₹10,000 = ₹1,800
Who Uses a GST Calculator?
- Business owners — Prepare invoices with correct GST-inclusive prices.
- Shopkeepers — Quickly determine the tax-exclusive price from a printed MRP.
- Freelancers — Add the correct GST to service invoices.
- Consumers — Check how much of a product's price is actually tax.
- Accountants — Verify tax amounts during audits or reconciliations.
Have questions about this tool?
Visit our FAQ page