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GST Calculator India

Add or extract GST using the combined rate you supply. See the base, tax and total reconcile to the paise.

Runs in your browser · No signup or saved history

Your calculation assumptions

Enter plain numbers without currency symbols or commas.

₹0–₹1,00,00,00,000. Up to 2 decimal places.
0–100%. Up to 6 decimal places. Enter the applicable rate yourself.
Choose whether your amount already includes the supplied GST.
Formula, rounding and limits

Exclusive: tax = base × rate / 100. Inclusive: tax = total × rate / (100 + rate). The combined tax rounds to paise, half up; base + tax always equals total. No cess or CGST/SGST/IGST component split is included. This arithmetic does not determine a product’s tax rate, taxable value, eligibility for credit, GST registration or legal invoice requirements.

Exclusive: tax = base × rate / 100. Inclusive: tax = total × rate / (100 + rate). The combined tax rounds to paise, half up; base + tax always equals total. No cess or CGST/SGST/IGST component split is included. This arithmetic does not determine a product’s tax rate, taxable value, eligibility for credit, GST registration or legal invoice requirements.