GST Calculator
Calculate Goods and Services Tax (GST) instantly. Find GST amount and total price.
Calculate GST
GST Rates in India
- 5% - Essential goods and food items
- 12% - Standard rated goods
- 18% - Most common goods and services
- 28% - Luxury and sin goods
How the GST Calculator Works
The GST calculator adds GST to a net amount or extracts GST from a tax-inclusive total. It is useful for receipts, product pricing and checking tax portions on invoices.
Formula
GST amount = net price x GST rate / 100. Gross price = net price + GST amount. For inclusive prices, GST portion = gross price x rate / (100 + rate).
Example
At 10% GST, a $100 net price becomes $110 gross. If $110 already includes GST, the GST portion is $10 and the net price is $100.
Limitations
GST rates, exemptions and reporting rules vary by country and product category. Confirm the correct rate before issuing tax documents.
How to use the result responsibly
- Check that every input uses the unit and time period shown beside the field.
- Compare the result with the worked example and formula above.
- For financial, tax, health, or legal decisions, confirm current rules with a qualified professional or the relevant authority.
Frequently Asked Questions
What is GST inclusive pricing?
GST inclusive means the tax is already inside the displayed total, so the calculator extracts the tax portion instead of adding it on top.
Can I use this for invoices?
You can use it to check the math, but invoices should still follow your local tax authority rules.
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Editorially reviewed August 18, 2026. Read our calculation methodology and editorial policy.