Reverse GST Calculator: extract GST from any price
Know the final price but need the base value and tax inside it? The Reverse GST Calculator does it instantly. Here's how.
Sometimes you have a GST-inclusive price (an MRP) and need to work backwards to the base amount and the GST inside it. Doing this by hand is error-prone; the Reverse GST Calculator gets it right every time.
The formula behind it
To remove GST from an inclusive price: base = inclusive ÷ (1 + rate). The GST amount is the difference. For example, ₹1,180 at 18% gives a base of ₹1,000 and GST of ₹180.
| Inclusive price | Rate | Base | GST |
|---|---|---|---|
| ₹1,050 | 5% | ₹1,000 | ₹50 |
| ₹1,120 | 12% | ₹1,000 | ₹120 |
| ₹1,180 | 18% | ₹1,000 | ₹180 |
| ₹1,280 | 28% | ₹1,000 | ₹280 |
When sellers need this
- Setting an MRP and needing the base value for your books.
- Reconciling marketplace payouts that quote inclusive prices.
- Issuing invoices where the customer paid an all-in amount.
- Checking a supplier's GST split on a quoted price.
Use it in three steps
- Open the Reverse GST Calculator.
- Enter the GST-inclusive amount.
- Pick the GST rate (find it with the HSN Code Finder) and read the base and tax.
Need this done for you?
Our in-house CA & CS team set up your virtual office, VPOB and GST end to end — ₹19,188/yr.
💬 Talk to our team View plans →Frequently asked questions
How do I remove GST from a price?
Divide the inclusive price by (1 + rate). For 18%, divide by 1.18 to get the base; the remainder is GST. The calculator does this automatically.
Is the Reverse GST Calculator free?
Yes, it's free and instant, with no sign-up required.
Which rate should I choose?
The rate for your product, determined by its HSN code. Use the free HSN Code Finder if you're unsure.
Get a free callback
Leave your details and our in-house CA & CS team will call you back — usually within a few business hours. No spam, no obligation.
- ✓ Free consultation on VPOB, APOB & GST
- ✓ Transparent pricing ₹19,188/yr
- ✓ Same-day document pack on most plans