GST Calculator
Add or remove GST at any rate to find the net, tax and gross amounts.
- Net amount
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- Gross amount
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Add or remove GST in seconds
GST (Goods and Services Tax) in India is charged at 5%, 12%, 18% or 28% depending on the item. Sometimes a price already includes GST and you need the tax portion out of it; other times you have a base price and need to add GST on top. This calculator handles both directions at any rate.
How GST is calculated
To add GST: tax = amount × rate ÷ 100 and the gross =
amount + tax. To remove GST from a gross figure: net =
amount ÷ (1 + rate ÷ 100) and the tax = amount − net. Choose the mode that
matches your figure.
How to use the GST Calculator
- Enter the amount. Type the base amount to add GST to, or the gross amount to remove GST from.
- Pick the GST rate. Choose 5%, 12%, 18% or 28%, or select Custom to type your own rate.
- Choose add or remove. Select whether your amount excludes GST (add) or already includes it (remove).
- Read the breakdown. See the net amount, GST amount and gross amount instantly.
Frequently asked questions
What is the difference between adding and removing GST?
Add GST when your amount is the net price and you need the tax on top. Remove GST when your amount already includes tax and you need to find the net and tax portions.
What are the GST slabs in India?
The main GST rates are 5%, 12%, 18% and 28%. The correct slab depends on the goods or service; use the custom option for any other rate.
How is GST split into CGST and SGST?
For intra-state sales the GST is split equally into CGST and SGST — an 18% rate is 9% CGST plus 9% SGST. This tool shows the combined GST amount.
Is my invoice data stored?
No. The calculation runs entirely in your browser; nothing you enter is sent to or stored on a server.