GST Calculator (India)

Inclusive/Exclusive • CGST/SGST/IGST split • Rounding • Presets • Share • CSV • Recent history

Illustration of GST calculation showing base, GST and total — Privacy-first: calculations run in your browser. No data leaves your device.

Amount (?)

GST Rate

Amount Type Amount is GST-inclusive

Unchecked = amount is before GST (exclusive)

Supply Type

Intra-state (CGST+SGST) Inter-state (IGST)

Rounding

Also try: Income Tax Calculator

Recent calculations

Up to 5 items are kept in your browser (private).

How to use this GST Calculator

Enter the amount, select GST rate (or Custom), and choose whether your amount is inclusive of GST.
Pick Intra-state to see CGST+SGST split (equal halves), or Inter-state for IGST.
Change rounding to match your invoicing (paise vs nearest ?1).
Use Share to copy a link with your inputs, and Download CSV for records.

Related tools: Income Tax, EMI, Currency Converter.

Quick demo

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How this GST calculator works

Enter an amount and choose a GST rate (5%, 12%, 18%, 28% or custom). Select whether the amount is GST-inclusive or exclusive, and whether the supply is intra-state (CGST+SGST) or inter-state (IGST). For GST-inclusive, the base is back-calculated as amount � (1 + rate), and GST is the difference between total and base. For GST-exclusive, GST is base � rate and total = base + GST. When intra-state is chosen, GST splits equally into CGST and SGST; for inter-state, IGST applies.

Examples

Inclusive 18%: Amount ?1,180 inclusive . base = 1180/1.18 = ?1,000; GST = ?180 (CGST ?90 + SGST ?90, or IGST ?180).

Exclusive 12%: Base ?2,000 exclusive . GST = 2000 � 12% = ?240; total = ?2,240.

You can round to the nearest rupee for invoices or keep paise for precise calculations. Share a link or export CSV for records.

FAQs

CGST/SGST vs IGST?

Intra-state supplies split GST into equal CGST and SGST components. Inter-state supplies levy IGST. This is a display split and doesn�t change the total.

Which rates are common?

Many essentials are 0% or 5%; services and goods often fall under 12% or 18%; luxury items may be 28%. Always verify the applicable rate for your item/service.

Is this a filing tool?

No. It�s a quick calculator to estimate base/GST/total for quotes and invoices; it does not file returns.