GST Calculator
Calculate the GST (Goods and Services Tax) amount on a price, and the final price including tax, for any GST rate.
About this gst calculator
GST is charged on most goods and services in India and several other countries. This calculator adds GST to a base price, useful for invoicing, pricing, and checking a bill.
How gst calculator works
The formula is: GST Amount = (Price × GST Rate) ÷ 100, and Total Price = Price + GST Amount. For example, a ₹1,000 item with 18% GST adds ₹180, for a total of ₹1,180.
Common uses
- Adding GST to a price for an invoice
- Checking the GST amount on a bill or receipt
- Comparing prices at different GST rate slabs (5%, 12%, 18%, 28%)
How to use this tool
- Enter the base price.
- Enter the GST rate percentage.
- See the GST amount and total price instantly.
What to know before using it
This calculates GST on a base (pre-tax) price. If you have a GST-inclusive price and need to extract the base price and tax amount separately, divide the inclusive price by (1 + GST rate/100) to get the base price first.
Privacy and browser-first processing
This tool runs entirely in your browser using JavaScript. Nothing you enter is uploaded or stored.
Frequently asked questions
What are the common GST rate slabs in India?
Common slabs are 5%, 12%, 18%, and 28%, depending on the category of goods or services, check current official rates for your specific item.
How do I calculate the base price from a GST-inclusive total?
Divide the inclusive total by (1 + GST rate ÷ 100). For an 18% rate, divide by 1.18.