What this GST calculator does
The calculator adds GST to a base amount or removes GST from a tax-inclusive total. It also shows the basic equal CGST and SGST split for intra-state examples.
GST calculator
GST calculator India
Add GST to a base price or remove GST from an inclusive price for common Indian GST rates.
Published by Calculator All-in-OneLast reviewed: 12 August 2026Formula method checked: standard planning arithmeticTesting and editorial standards
Add GST versus remove GST
Use add GST when you know the base price before tax. Use remove GST when a price already includes GST and you need to estimate the taxable value and tax amount.
Rate selection warning
This page does not decide the legal GST rate for a product or service. Classification can change and should be checked using current official guidance or a tax professional.
Invoice use
For invoices, verify GSTIN, place of supply, tax type, rate, rounding, HSN/SAC, and current compliance requirements. The calculator only performs arithmetic.
Review method and source trail
The calculation uses transparent arithmetic from the inputs shown on the page. It does not include lender-specific fees, tax classification, market volatility, eligibility rules, or provider quotations unless you enter those values yourself. See the editorial standards and site disclaimer for how estimates, file tools, and safety notes are reviewed.
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FAQs
Which GST rates are included?
The form includes common 0%, 5%, 12%, 18%, and 28% rates.
Can this decide my GST rate?
No. It calculates arithmetic after you choose the rate.
What is remove GST?
It extracts the base value and tax amount from a GST-inclusive total.
Is CGST and SGST always equal?
For many intra-state examples, GST is split equally, but actual tax type depends on transaction context.
Does this file GST returns?
No. It is only a calculator.
Should I verify official rules?
Yes, especially for tax filing and business invoices.