How do I remove GST from a total price?

Base amount = Total ÷ (1 + GST rate ÷ 100). This calculator does that automatically when you choose "Remove GST".

Which GST rates does this support?

The common Indian slabs — 0%, 5%, 12%, 18% and 28% — plus any custom rate you need to enter.

Is this calculator accurate for invoices?

It performs standard GST arithmetic and is useful for quick estimates. For formal invoicing, always confirm figures with your accountant or GST software.

Business Tool

Free GST Calculator (India)

Work out GST on any amount in seconds — add GST to a base price or extract it from a GST-inclusive total, using the standard Indian GST slabs or your own custom rate.

Base amount (₹)

GST rate

Result

Enter an amount to see the GST breakdown.

Standard 0/5/12/18/28% slabsAdd or remove GST instantlyNo data leaves your device

How it works

Use it in three simple steps.

Enter the amount

Type the base amount or the GST-inclusive total, whichever you have.

Choose the GST rate

Pick 0%, 5%, 12%, 18% or 28%, or enter a custom percentage.

Pick Add or Remove GST

Add GST to calculate the total payable, or remove GST to find the base price hidden inside a total.

Key features

Built to be fast, private and free.

Every Fenbrix tool runs fully in your browser — nothing you enter is uploaded or stored on our servers.

Standard Indian GST slabs: 0%, 5%, 12%, 18%, 28%

Custom GST percentage support

Add GST or remove GST from a total

Clear breakdown of base amount, GST amount and total

Indian Rupee formatting throughout

Why this tool

Why use this GST calculator?

GST math is simple in theory but easy to get wrong under pressure — especially when working backwards from a GST-inclusive price to the base amount. This calculator handles both directions instantly, using the exact slabs used across India.

It's built for freelancers, small business owners and anyone quoting or checking prices who wants a fast, accurate second opinion without opening a spreadsheet or accounting software.

Questions