Can I calculate GST from an inclusive price?

Yes. Use inclusive mode to back out the base amount and tax component from a tax-inclusive total.

What is the difference between CGST/SGST and IGST?

Intra-state supplies typically split GST into CGST and SGST; inter-state supplies use IGST. The calculator helps with amounts—your place of supply rules decide which applies.

Is this a substitute for a CA or GST portal?

No. It is a free arithmetic helper. Filing, input tax credit, and compliance still follow government portals and professional advice.

Does my invoice data leave the browser?

Calculations run locally. You are not uploading invoice lines to our servers for this GST math tool.

GST Calculator (India)

Add or remove GST (5%, 12%, 18%, 28%) from an amount.

Amount (₹)

GST rate

Mode

Exclusive of GST

₹1000.00

GST amount

₹180.00

Inclusive of GST

₹1180.00

About this tool

Indian invoices need clean GST math: exclusive price, tax amount, and grand total—or the reverse when a quote is tax-inclusive. This free GST calculator handles common rates and shows CGST/SGST or IGST-style splits. Enter the base amount and rate to get totals you can copy onto bills or estimates. Built for freelancers, shop owners, and accountants who want a quick check without a spreadsheet.

How to use

Enter the taxable amount (exclusive) or the inclusive total, depending on mode.
Select the applicable GST rate (for example 5%, 12%, 18%, or 28%).
Choose whether you are adding GST or extracting GST from an inclusive figure.
Review taxable value, GST amount, and grand total.
Note CGST/SGST or IGST-style halves when the UI shows them for your scenario.
Copy figures into your invoice or accounting sheet.

Features

Add GST to a base amount
Extract GST from inclusive totals
Common India GST rate presets
CGST/SGST or IGST-style amount views
Free calculator

Notes

Does not file returns or generate e-invoices
Special schemes/exemptions need manual judgment
Rate selection is your responsibility per product/service

Frequently asked questions

It is geared toward common Indian GST percentages used on invoices. Always confirm the rate that applies to your HSN/SAC with official guidance.

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