GST Calculator

Goods and Services Tax is an indirect-tax framework applied to taxable supplies under applicable law. This page explains only percentage arithmetic; it does not decide whether a transaction is taxable or which classification, notification, or place-of-supply rule applies.

1. Enter an amount and choose whether it is exclusive or inclusive of GST.
2. Use a common preset or enter a custom percentage.
3. Select intra-State or inter-State arithmetic yourself.
4. Review the exclusive value, GST, inclusive value, and selected tax-head breakdown.

A GST-exclusive amount is the taxable base before the entered GST percentage is added. A GST-inclusive amount contains both that base and the embedded GST. The GST Portal's GSTR-1 guide describes total invoice value as inclusive of taxes, while taxable value is a distinct field.

Multiply the exclusive value by the entered percentage divided by 100. Add the resulting GST amount to the exclusive value to obtain the inclusive value.

Divide the inclusive value by 1 plus the entered rate as a decimal. The difference between the inclusive value and the derived exclusive value is the embedded GST.

For the intra-State selection, this calculator splits total GST equally into CGST and SGST/UTGST. For the inter-State selection, it shows the total as IGST. CBIC material supports the high-level distinction, but this calculator does not determine place of supply or infer the correct supply type.

The 5%, 12%, 18%, and 28% buttons are commonly encountered arithmetic presets represented in official schedules; they are not exhaustive and are not recommendations for any named supply. The 0% button is only a calculation option and does not declare a supply nil-rated, zero-rated, exempt, or outside GST.

A custom rate lets you test generic percentage arithmetic, including a value such as 7.5%, without presenting it as an official preset or suggesting legal applicability.

The calculator keeps unrounded numeric values and rounds each displayed total and tax head independently. Displayed CGST and SGST/UTGST halves can therefore differ by one paise from the separately rounded total; no hidden round-off adjustment is applied. Actual invoice totals can differ because of applicable rounding rules, accounting-system conventions, multiple items, discounts, and valuation adjustments.

• Separate an entered inclusive total into its base and GST components.
• Compare how the same entered rate changes exclusive and inclusive values.
• See the selected tax-head split without inferring the legal supply type.
• Share a complete validated arithmetic scenario for review.

• Confirm whether the amount entered is exclusive or inclusive.
• Verify the applicable classification and rate using current official material.
• Confirm place-of-supply treatment outside this calculator.
• Reconcile invoice-level rounding in the accounting or invoicing system actually used.

The calculation excludes compensation cess and other cess, reverse charge, input tax credit, composition levy, TDS/TCS, discounts and valuation adjustments, invoice-line rounding, e-invoicing, place-of-supply determination, return liability, filing, penalties, and legal or compliance decisions.

• Treating a preset as a rate-classification answer.
• Subtracting the percentage directly from an inclusive value.
• Letting an address assumption stand in for a place-of-supply decision.
• Reading a two-decimal display as invoice-ready legal computation.