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Fileraz
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Finance & Money Calculator
Illustrative math, reviewed October 2026 — not financial, tax, or legal advice. Verify rates and slabs before you sign or file.
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A GST calculator works both directions from one page. From an exclusive amount, GST is amount × rate and the total is amount + GST — ₹10,000 at 18% gives ₹1,800 tax and an ₹11,800 total. From a GST-inclusive amount, the base is inclusive ÷ (1 + rate), the figure you need when a price already contains tax. The page shows tax, total, and base together, plus the CGST/SGST halves.
Set whether your amount excludes or includes GST, then type the slab (5, 12, 18, or 28 for most goods and services). For intra-state supply, halve the GST for CGST and SGST; inter-state uses the full amount as IGST. Confirm the slab for your HSN code first — the tool computes on whatever rate you enter and cannot look it up.
It does not look up HSN-wise slabs, file returns, or handle reverse-charge and composition schemes — it is arithmetic on the rate you enter, so confirm the slab for your item first.
Illustrative math only — not financial advice or a bank quote.
Tax and statutory rules change; verify with a professional.
For intra-state supply, halve the GST amount shown — CGST and SGST are each half of the total rate. Inter-state supply uses a single IGST equal to the full amount.
Switch to Including GST mode and enter the billed amount: at 18%, an ₹11,800 bill backs out to a ₹10,000 base with ₹1,800 tax.
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