GST Calculator
Add or remove Goods and Services Tax (GST / VAT) arithmetic calculations from net or gross prices.
Use any currency — results use the same currency as your inputs.
Calculate Goods and Services Tax (GST) or Value Added Tax (VAT) additions and extractions.
[!NOTE] This calculator provides pure mathematical percentage calculations for tax-inclusive and tax-exclusive amounts. It does not constitute official tax, accounting, or legal advice.
Formulas & Method
Adding GST (Net → Gross / Tax Exclusive)
- GST Amount:
Net Amount × (GST % ÷ 100) - Gross Amount:
Net Amount + GST Amount
Removing GST / Reverse GST (Gross → Net / Tax Inclusive)
- Net Amount:
Gross Amount ÷ (1 + GST % ÷ 100) - GST Amount:
Gross Amount - Net Amount
Worked Example
For an initial amount of 100 at an 18% GST rate:
- Adding GST:
100 Net + 18.00 GST = 118.00 Gross - Removing GST / Reverse GST (from 118.00 Gross):
118.00 ÷ 1.18 = 100 Net(18.00 Tax)
Frequently Asked Questions
How do I add GST to a net price?+
Multiply the net amount by the GST rate percentage, then add the resulting tax amount to the net price to get the gross total.
How do I calculate Reverse GST (remove GST from a gross total)?+
Divide the gross tax-inclusive total by (1 + GST rate / 100) to extract the original net price before tax. Subtract the net price from the gross total to determine the exact tax amount.
What are standard GST tax rates in India?+
Common GST rates in India include 5%, 12%, 18%, and 28%, though the applicable rate depends on the goods or service classification and current tax rules. Please verify current applicable rates with tax authorities.
Is this tax tool providing legal or accounting advice?+
No. This tool is a general arithmetic calculator for percentage additions and removals. It does not provide legal or tax guidance.