GST Calculator

What is GST Calculator?

GST Calculator computes GST-inclusive and GST-exclusive amounts using Indian tax slabs like 5%, 12%, 18%, and 28%. It simplifies billing checks for shoppers, freelancers, and small businesses.

GST computations happen locally in your browser without sending billing values to servers.

How to use GST Calculator

1. 1Enter the base or final amount depending on your billing scenario.
2. 2Choose GST rate (for example 18%).
3. 3Select Add GST or Remove GST mode.
4. 4View tax component and final payable/pretax amount instantly.

Examples

Base ₹1,000 at 18% -> GST ₹180, Final ₹1,180

Inclusive ₹1,180 at 18% -> Base ₹1,000, GST ₹180

Tips & common mistakes

• Use the correct GST slab from your invoice category before calculation.
• For inclusive prices, always use Remove GST mode to avoid double counting tax.
• Round tax values according to your invoicing/accounting policy.

Who uses this tool?

• •Freelancers generating tax-inclusive service invoices.
• •Retail buyers verifying GST charged on bills.
• •Small businesses estimating pricing before issuing quotations.

Frequently asked questions

How do I calculate GST from a total inclusive amount?

Use Remove GST mode with the applicable rate. The calculator derives base value and tax component from the final amount.

Which GST rate should I use?

Use the slab defined for your product/service category in current GST rules (commonly 5%, 12%, 18%, or 28%).

Can I calculate CGST and SGST separately?

Yes, once total GST is known, split equally into CGST and SGST for intra-state supplies where applicable.

Does this work for business purchase planning?

Yes, it helps estimate pre-tax and post-tax values while preparing budgets and vendor comparisons.

Is GST added on discount or original price?

Usually GST applies to taxable value after eligible discounts, but confirm invoice and compliance rules for your case.