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GST Calculator

₹
%

Base Price

₹10,000

GST Amount

₹1,800

Tax Breakup

CGST (9%)₹900
SGST (9%)₹900

Total Amount

₹11,800

GST Calculator — Overview

A GST Calculator is an essential tool for businesses and consumers in India to quickly compute the Goods and Services Tax on any transaction. It supports both GST-exclusive (adding GST to a base price) and GST-inclusive (extracting GST from a total price) calculations.

The calculator also provides a detailed breakup of CGST and SGST for intra-state transactions and IGST for inter-state transactions, covering all standard GST rates of 5%, 12%, 18%, and 28%.

How is it calculated?

Select whether your amount is GST Exclusive (base price without tax) or GST Inclusive (price already includes tax). Enter the amount and choose the applicable GST rate.


GST Exclusive: GST Amount = Original Price x (GST Rate / 100)

GST Inclusive: Base Price = Original Price x (100 / (100 + GST Rate))


For intra-state sales, the GST is split equally between CGST and SGST. For inter-state sales, the entire amount is charged as IGST.

Frequently Asked Questions

CGST (Central GST) and SGST (State GST) are levied on intra-state transactions - when the buyer and seller are in the same state. The total GST is split equally between them. IGST (Integrated GST) is levied on inter-state transactions and is equal to the full GST rate.

India currently has four main GST slabs: 5%, 12%, 18%, and 28%. Essential items fall under 5%, standard goods under 12% or 18%, and luxury or sin goods under 28%. Some items like unprocessed food are exempt (0% GST).

To extract GST from an inclusive price, use this formula: GST Amount = Total Price - (Total Price x 100 / (100 + GST Rate)). For example, if the inclusive price is Rs 1,180 at 18% GST, the base price is Rs 1,000 and the GST is Rs 180.

Businesses with annual turnover exceeding Rs 40 lakh (Rs 20 lakh for special category states) for goods, or Rs 20 lakh (Rs 10 lakh for special category states) for services, must register for GST.

This calculator provides accurate GST breakups suitable for quotation estimates and quick reference. For official billing and invoicing, you should use GST-compliant accounting software that generates proper tax invoices.

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