Calculate GST in either direction: add tax to a base amount or reverse a GST-inclusive amount into its base value and GST component.
Calculate GST-inclusive and GST-exclusive amounts in India. Add GST to a base price or remove GST from a tax-inclusive total with common rate presets.
Figures are estimates for informational use and are not financial, tax or investment advice. Verify current provider and regulatory terms before making decisions.
To add GST, multiply the base amount by the selected GST rate and divide by 100. The GST-inclusive total is the base amount plus that tax.
For example, on a base amount of ₹1,000 at 18%, GST is ₹180 and the total is ₹1,180.
To reverse an inclusive price, divide the GST-inclusive amount by 1 + rate/100. The difference between the inclusive total and that base amount is the GST component.
For an inclusive total of ₹1,180 at 18%, the base value is ₹1,000 and the GST component is ₹180.
India does not have one universal GST rate for every supply. CBIC publishes rate schedules and FAQs, and the applicable rate depends on the classification and nature of the goods or services.
Toolmera provides common 5%, 12%, 18% and 28% presets for convenience, but those buttons do not determine the legally applicable rate for a specific transaction. Verify the current official classification when accuracy matters.
Use the inclusive GST calculator when the amount you already have includes GST and you need to separate it into the pre-tax base value and the GST component. Choose Remove GST, enter the GST-inclusive total and the applicable rate, and Toolmera reverses the tax without treating the full amount as the taxable base.
For an inclusive amount, the base value is Inclusive total ÷ (1 + rate/100). The GST portion can then be found as Inclusive total − base value, or directly as Inclusive total × rate ÷ (100 + rate). For example, ₹1,180 inclusive of 18% GST resolves to a ₹1,000 base amount and ₹180 GST.
Select whether your starting amount is before tax or already GST-inclusive.
Use a preset or enter the percentage applicable to your scenario.
Toolmera separates the base value, GST component and GST-inclusive total.
Reference material used for assumptions and regulatory context:
Multiply the base price by the GST percentage to get the tax amount, then add that tax to the base price.
Divide the inclusive total by 1 + GST rate/100 to recover the base amount, then subtract the base from the inclusive total to get the GST component.
No. They are common headline slabs, but exemptions and other rates can apply depending on classification. Check current CBIC/GST Council information for the actual supply.
No. It performs arithmetic only and does not determine classification, place of supply, input tax credit, filing obligations or legal tax treatment.