GST Calculator – Calculate GST Amounts Instantly
GST Calculator is a free online tax calculation tool that helps businesses, shop owners, accountants, freelancers, students, and taxpayers calculate Goods and Services Tax (GST) quickly and accurately.
Calculate GST quickly and accurately with our free GST Calculator. Whether you need to add GST to a product price, remove GST from a total amount, calculate CGST, SGST, or IGST, this tool provides instant results. Supporting all major GST slabs including 5%, 12%, 18%, and 28%, the calculator helps simplify tax calculations, invoicing, and financial planning without requiring manual formulas or complex spreadsheets.
Calculate GST Instantly
Find the exact GST amount based on custom or standard tax slabs in milliseconds.
Inclusive & Exclusive
Easily switch between adding GST to a base price or extracting GST from a final price.
CGST, SGST & IGST
Get an automatic breakdown of the tax amount into State and Central tax components.
Invoice GST Calculation
Perfect for quickly verifying invoice totals or preparing bills for your clients.
GST Inclusive and Exclusive Calculator
Understanding the difference between inclusive and exclusive GST is critical for businesses. If a product is marked as "GST Exclusive", it means the tax is not yet added to the base price. You must Add GST to find the final customer price. If a product is marked as "GST Inclusive", the tax is already baked into the final price. You must Remove GST to find out what your actual revenue (base price) is. Our Online GST Calculator handles both scenarios seamlessly.
Note: Do you need to calculate discounts before applying tax? Use our Discount Calculator first.
GST Formula and Examples
If you are doing manual accounting, here are the formulas our GST Amount Calculator uses under the hood:
Adding GST (Exclusive Amount):
GST Amount = (Original Cost × GST %) / 100Net Price = Original Cost + GST AmountRemoving GST (Inclusive Amount):
GST Amount = Original Cost - [Original Cost × (100 / (100 + GST %))]Net Price = Original Cost - GST AmountExample Calculation (Add GST):
Product Price: ₹1,000
GST Rate: 18%
GST Amount: ₹180
Final Price: ₹1,180
CGST: ₹90 | SGST: ₹90
Frequently Asked Questions
What is a GST Calculator?
A GST Calculator is a specialized financial tool that computes the exact Goods and Services Tax (GST) amount, providing a breakdown of CGST, SGST, IGST, and the final net/gross prices based on the selected tax slab.
How do I calculate GST online?
Select whether the tax is inclusive or exclusive, enter the base or final amount, and choose the GST percentage. The tool instantly calculates the exact GST and the final payable amount.
Can I calculate CGST and SGST separately?
Yes. The GST Calculator automatically divides the total GST amount by two to provide separate CGST (Central GST) and SGST (State GST) values, which is required for intrastate invoicing.
Can I remove GST from an amount?
Yes. By selecting the "GST Inclusive" mode, the calculator will perform a reverse calculation to extract the tax amount from the final price, revealing the original pre-tax base price.
Is the GST Calculator free?
Yes. The GST Calculator tool is completely free for everyone to use and works directly in your browser across all devices.