GST Calculator
Add or remove GST from any amount at common Indian GST slabs.
Updated for the GST reform effective 22 September 2025 (0%, 5%, 18%, and 40% slabs). Legacy 12% and 28% rates are kept for reference on older invoices.
How to use the GST Calculator
Enter the amount, choose the GST rate, and pick whether to add or remove GST.
- 1
Enter the amount
Type the base amount or GST-inclusive amount.
- 2
Select GST rate
Choose 5%, 12%, 18%, or 28% depending on the goods or service.
- 3
Choose Add or Remove
Add GST to a base price, or remove GST from a total.
Frequently Asked Questions
What are the common GST rates in India?
The most commonly used GST slabs in India are 5%, 12%, 18%, and 28%, depending on the category of goods or service.
How do I remove GST from a total that already includes it?
Divide the GST-inclusive amount by 1 plus the GST rate divided by 100 to get the base amount — this calculator does that automatically.
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