GST Calculator
Add GST to a price or remove GST from an inclusive amount โ instantly, with the CGST/SGST/IGST split.
Want unbranded documents & full GST billing?
Get the free SmartVyapaar app โ your logo, no footer, plus customers, payments, stock & reports. Trusted by 1,000+ businesses.
GST rate
Want unbranded documents & full GST billing?
Get the free SmartVyapaar app โ your logo, no footer, plus customers, payments, stock & reports. Trusted by 1,000+ businesses.
How to use this tool
- 1
Enter the amount you want to calculate GST on.
- 2
Choose whether the amount excludes or includes GST.
- 3
Pick the GST rate (5%, 12%, 18%, 28% or custom).
- 4
See the GST amount, CGST/SGST or IGST split, and net/gross totals.
About the GST Calculator
GST (Goods and Services Tax) in India is charged at slab rates โ most commonly 5%, 12%, 18% and 28%. For sales within a state it's split into CGST and SGST (half each); for inter-state sales it's charged as IGST.
This calculator works both ways: enter a base price to add GST, or enter a GST-inclusive price to find the tax already inside it. It's perfect for quick billing, pricing and reverse-GST checks.
Need full invoices with this maths built in? The free SmartVyapaar app calculates GST automatically on every bill and keeps you GST-ready.
Frequently asked questions
Select 'Amount includes GST', enter the gross price and choose the rate. The tool shows the base amount and the GST contained in it.
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From the blog
Guides on GST, billing and running a business in India.
GST Invoicing in India: The Complete Guide for Small Businesses
Everything an Indian SME needs to raise correct, GST-compliant invoices โ mandatory fields, tax types, numbering, rounding and common mistakes to avoid.
2 Jun 2026
How to Register for GST in India: A Step-by-Step Guide for SMEs
Who needs GST registration, the turnover thresholds, documents required and the full online process on the GST portal โ explained simply for small businesses.
20 May 2026
CGST, SGST & IGST Explained: Place of Supply Made Simple
Confused about when to charge CGST+SGST versus IGST? This plain-English guide explains India's dual GST, the place-of-supply rule and worked examples.
8 May 2026
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These free web tools are just the start. The SmartVyapaar app does GST invoicing, customers, payments, stock, expenses and reports โ with unbranded, fully-yours PDF documents.
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