How to use it
- 1.Enter the amount.
- 2.Select the GST rate for the goods or service.
- 3.Choose whether to add GST or remove it from an inclusive price.
- 4.Read the base value, GST and invoice value, and the CGST, SGST or IGST split.
Updated
GST Calculator
The GST calculator applies the selected rate to an amount. Change every input and see the estimate update immediately.
Adjust your assumptions
₹
₹0₹10,00,00,000
Your estimate
₹18,000
GST amount
Base value
₹1,00,000
Invoice value
₹1,18,000
CGST + SGST (intra-state, each)
₹9,000
IGST (inter-state)
₹18,000
Educational estimate only. Methodology 2026.08. This is not a return promise, loan offer, tax filing or financial recommendation.
Results are estimates for learning and planning only. Tax rules, interest rates and scheme terms change from time to time, and your actual figures may differ. Please talk to a qualified financial advisor or chartered accountant before making any financial decision.
GST Calculator: what it calculates.
Goods and Services Tax (GST) is charged on most supplies of goods and services in India. Prices are quoted either before GST, with tax added on the invoice, or inclusive of GST. This calculator works in both directions and shows the CGST, SGST and IGST split.
The GST calculator applies the selected rate to an amount. When GST is added it returns the tax and invoice value; when the amount already includes GST it separates out the base value and the tax.
How the calculation works.
Add GST: GST = Amount × rate. Remove GST: GST = Amount − Amount ÷ (1 + rate)
- Rate presets are 0%, 0.25%, 3%, 5%, 18%, 28% and 40%, with a custom option.
- For a supply within one state, GST is split equally into CGST and SGST.
- For a supply between states, the full amount is IGST.
- Compensation cess is not included.
Worked example. Adding 18% GST to ₹1 lakh gives GST of ₹18,000 and an invoice value of ₹1,18,000, split as ₹9,000 CGST and ₹9,000 SGST within a state. Removing 18% from an inclusive price of ₹1,18,000 gives back a base value of ₹1 lakh.
What it helps with
- Works for both GST-exclusive and GST-inclusive prices.
- Shows the intra-state and inter-state split.
- Covers the common rate presets and a custom rate.
What it does not include
- The correct rate depends on classification and the nature of supply; the calculator does not decide it.
- Compensation cess and special schemes are excluded.
- GST rates change through notifications; check the current rate.
- The result is an estimate, not an invoice.
Rule basis: GST rate basis reviewed 2026-27
Effective 2026-04-01. Reviewed 2026-08-10.
Review again after 2027-03-31.
Policy-linked estimates can become stale. Confirm current eligibility, rates, limits and filing treatment before acting.
Common questions.
Does the GST estimate include compensation cess?
No. Cess and product-specific exceptions are excluded unless separately verified.
What is a GST Calculator?
It is an educational tool that applies the disclosed GST arithmetic method to the assumptions you enter.
Are the results guaranteed?
No. Results are estimates, not forecasts, approvals, quotations or guarantees.
Why should I change the assumptions?
Testing conservative and optimistic inputs exposes uncertainty instead of hiding it behind one number.
Does it include tax and fees?
Only when a tax or fee is shown as an explicit input or result. Otherwise it is excluded.
How accurate is the calculator?
The mathematics follows the stated methodology, while real outcomes depend on rates, timing, rules, fees and circumstances.
Can I use this result as financial advice?
No. Use it for education and scenario comparison, then verify decisions with official documents or a qualified professional.
Why is inflation shown?
Inflation translates a future amount into approximate present-day purchasing power. The default 6% is editable and is not a forecast.
How often should I recalculate?
Recalculate when rates, income, contributions, rules, goals or repayment terms change.
Can the result differ from a bank or platform?
Yes. Institutions may use different compounding dates, rounding, charges and eligibility rules.
Is my data uploaded?
No. Calculations run locally in your browser and the input values are not sent to a calculation server.