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GST Calculator
Free GST calculator for India to add or remove GST and estimate taxable value, CGST, SGST and total amount for common GST rates.
Explore Business ToolsCalculate GST instantly
Switch between GST-exclusive and GST-inclusive calculations with a clear tax split.
GST Calculator Guide: Formula, Inclusive GST & Tax Split
Use the calculator above to estimate GST on a taxable amount. Choose whether GST should be added to a base price or extracted from a GST-inclusive total. For an intra-state transaction, the displayed GST is split equally into CGST and SGST as a calculation aid.
GST calculation formula
GST exclusive: GST amount = Taxable value × GST rate ÷ 100.
Final amount: Taxable value + GST amount.
GST inclusive: Taxable value = Inclusive amount × 100 ÷ (100 + GST rate).
Final amount: Taxable value + GST amount.
GST inclusive: Taxable value = Inclusive amount × 100 ÷ (100 + GST rate).
GST calculation example
For a taxable value of ₹1,000 at an 18% GST rate, the GST estimate is ₹180 and the total becomes ₹1,180. If treated as an intra-state supply for this simple split, CGST is ₹90 and SGST is ₹90.
5% GST₹1,000 base → ₹50 GST → ₹1,050 total
12% GST₹1,000 base → ₹120 GST → ₹1,120 total
18% GST₹1,000 base → ₹180 GST → ₹1,180 total
GST inclusive vs GST exclusive
GST-exclusive pricing starts with the taxable value and adds tax on top. GST-inclusive pricing starts with a total that already contains tax, so the calculator works backwards to estimate the taxable portion and GST component.
CGST, SGST and IGST
For Indian GST, intra-state supplies generally involve CGST plus SGST/UTGST, while inter-state supplies generally involve IGST. The calculator is an arithmetic utility; the correct tax treatment, place of supply, rate, exemptions and compliance requirements depend on the actual transaction.
Who can use this free GST calculator?
It is designed for quick estimates by buyers, sellers, freelancers, wholesalers, manufacturers and small businesses checking quotations, invoices and pricing. For filing or legal tax treatment, verify the applicable GST rules and rate for the transaction.
AI-GUIDED WORKFLOW
01 → 04How to use GST Calculator
Four simple steps. The interface keeps the workflow focused while you stay in control of the final result.
Let the smart workflow process it
Use the focused controls to generate or calculate the result.
Review the result
Check accuracy, wording and output before important use.
Export or continue
Download, copy or use the result in your next workflow.
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Smart-tool guidance
AI-generated or automatically processed results can occasionally need correction. Review important business, financial, legal, career or publishing output before using it.
USEFUL · FOCUSED · SEARCH-READY
A focused online GST Calculator workflow
Free GST calculator for India to add or remove GST and estimate taxable value, CGST, SGST and total amount for common GST rates. The workspace is designed to keep input, review and export steps clear on desktop and mobile.
Designed for a review-first workflow
Free GST calculator for India to add or remove GST and estimate taxable value, CGST, SGST and total amount for common GST rates. Use the workspace above, check the generated or processed result, and only then download, copy or publish it. TradesFolks keeps each Smart Tool focused so the page explains the task instead of hiding it behind a signup wall.
HELP CENTER
GST Calculator FAQs
Quick answers about the workflow, output and practical limitations.
Can it show CGST and SGST?+
Yes. For the calculated GST amount, the result includes an equal CGST and SGST split for applicable intra-state calculations.
Can I calculate GST-inclusive prices?+
Yes. Choose the inclusive mode to separate taxable value and GST from a price that already includes tax.
Is GST Calculator free to use?+
TradesFolks currently provides this Smart Tool as a free online utility. Reasonable technical or AI usage limits may apply where needed for reliability.