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GST CALCULATOR

GST Calculator India: Add or Remove GST

Estimate tax on a base price or remove GST from an inclusive amount. Choose the supply type to view a CGST/SGST or IGST breakdown.

Enter the price before GST

Find rate by product / service →

The calculator performs arithmetic using the rate you select. It does not determine the correct GST classification or rate for a particular supply. Confirm the applicable HSN/SAC classification and notified rate before using the result for compliance.

Supply type

Select based on the place of supply and location of the supplier.

YOUR ESTIMATE

GST breakdown

Intra-state supply · CGST + SGST

Base Amount ₹0.00
GST Amount (18%) ₹0.00
CGST (9%) ₹0.00
SGST (9%) ₹0.00
Total Amount ₹0.00

How it works

Add GST: Base × Rate ÷ 100

Remove GST: Total ÷ (1 + Rate ÷ 100)

How to use the GST Calculator

This calculator performs GST arithmetic in your browser using the amount and rate you enter. It does not identify the legally correct rate, classify a supply, or determine your filing position.

1. Adding GST to a Base Price

To add a selected rate to an amount, choose "Add GST", enter the base price, and choose a preset or custom rate. The calculator multiplies the amount by that rate to show the GST component and total.

2. Reverse GST calculator: removing GST from an inclusive price

To extract the pre-tax amount from a GST-inclusive total, select "Remove GST", enter the total, and choose the rate. The tool divides the total by (1 + (GST Rate / 100)). This arithmetic extraction is different from statutory Reverse Charge Mechanism (RCM).

3. Understanding CGST, SGST, and IGST

The display option controls how the selected tax amount is presented. Confirm the correct supply treatment, applicable rate, and HSN or SAC classification from current official sources before relying on a result:

  • Intra-State Supply (Within the same state): The total GST is divided equally into Central GST (CGST) and State GST (SGST). For example, an 18% rate becomes 9% CGST and 9% SGST.
  • Inter-State Supply (Between two different states): The entire tax amount is collected as Integrated GST (IGST) at the full rate.

Related Guides

Frequently Asked Questions

Common questions about calculating GST in India.

How do I add GST to a price?
Multiply the base price by the selected rate and divide by 100 to get the tax. Add the tax to the base price for the total. For example, ₹1,000 at 18% gives ₹180 GST and a total of ₹1,180.
How do I remove GST from an inclusive price?
Divide the GST-inclusive amount by 1 plus the selected rate divided by 100. For example, ₹1,180 ÷ 1.18 = ₹1,000 before tax, with ₹180 GST. This is an arithmetic extraction and is different from statutory reverse charge.
How are CGST, SGST, and IGST displayed?
For the intra-state option, the calculator splits the selected total rate equally into CGST and SGST. For the inter-state option, it displays the full selected rate as IGST. The tool does not determine the legally correct place-of-supply treatment for your transaction.
Does the calculator tell me which GST rate applies?
No. You choose the rate. Confirm the classification and current rate from the applicable official schedules and notifications; an HSN or SAC search result is only a reference.
Can I use the result to file a return or invoice?
Treat the result as an estimate based on the amount and rate you entered. Verify the underlying facts, rate, classification, and current requirements with official sources or a qualified tax professional before using it for compliance.
Can this GST calculator handle an invoice with multiple products?
It calculates one amount and one selected rate at a time. If an invoice has items with different rates, calculate each taxable line separately using a rate you have verified, then reconcile the invoice totals and applicable adjustments.
Does the intra-state or inter-state option decide my place of supply?
No. The option only changes how the selected GST amount is displayed: as a CGST/SGST split or as IGST. Determine the legally applicable place of supply from the transaction facts and current GST rules before choosing a display.
Are discounts, freight, or cess included in the calculation?
The calculator applies the rate you select to the amount you enter. It does not separately assess discounts, freight, cess, or other invoice adjustments; confirm how those affect taxable value for your transaction.
Why might the calculator result differ from an invoice total?
The invoice may use a different taxable value or rate, include multiple line items, apply transaction-specific valuation or discount rules, add cess, or use a different rounding method. Compare the inputs and invoice treatment before relying on the estimate.
Can I use the GST calculator on a mobile phone?
Yes. The calculator is available in a mobile browser. Enter the amount, select a rate and display option, then review the estimate on the same page; no app installation is required.