GST Calculator
What is the GST Calculator?
The GST Calculator is a free online tool designed for Indian consumers, traders, accountants, and business owners to quickly compute Goods and Services Tax. Introduced in India on 1 July 2017, GST replaced multiple indirect taxes like VAT, service tax, and excise duty with a unified tax structure. Our calculator supports both GST addition (calculating the final price after adding GST) and GST removal (finding the original base price from a GST-inclusive amount). It covers all four standard GST slabs — 5%, 12%, 18%, and 28% — along with the 0% exempt category. Whether you are a retailer billing customers, a buyer checking the tax component on an invoice, or a professional filing GST returns, this tool provides instant and accurate results for everyday GST calculations.
How to Use the GST Calculator
- 1. Enter the price amount in the input field (original price or GST-inclusive price).
- 2. Select the GST rate applicable — 5%, 12%, 18%, or 28%.
- 3. Choose the mode: Add GST (to get price + tax) or Remove GST (to extract base price from inclusive total).
- 4. The GST amount, original/net price, and final price are shown instantly.
Formula Used
For Add GST, multiply the original price by the GST rate percentage and divide by 100 to get the tax, then add to the original price. For Remove GST, divide the total (inclusive) price by 1 plus the decimal GST rate to find the pre-tax price.
Practical Example
Adding GST: A product with a base price of ₹1,000
at 18% GST: GST Amount = 1000 × 18 / 100 = ₹180; Total price = ₹1,000 +
₹180 = ₹1,180.
Removing GST: If you receive an invoice for
₹1,180 inclusive of 18% GST, the original price = 1180 / 1.18 = ₹1,000, and GST component
= ₹1,180 - ₹1,000 = ₹180.
Why Use Our GST Calculator?
- • Covers all Indian GST slabs — 5%, 12%, 18%, and 28% with a single tool.
- • Supports both Add GST and Remove GST modes for complete billing and invoicing needs.
- • Instant results with clear breakup of GST amount, base price, and total price.
- • Free to use, no registration required, works perfectly on mobile devices.
Frequently Asked Questions
What are the GST tax slabs in India?
India's GST has four slabs: 5% (daily necessities), 12% (processed foods, certain electronics), 18% (most services, electronics, consumer goods), and 28% (luxury items, automobiles, tobacco). Essential commodities like food grains, fresh vegetables, and medicines are exempt (0% GST).
How do I calculate GST on a price?
Multiply the base price by the GST rate and divide by 100. For example, ₹1,000 at 18% GST: Tax = ₹1,000 × 18 / 100 = ₹180. Final price = ₹1,000 + ₹180 = ₹1,180. Our calculator does this instantly for any price and rate combination.
What is the difference between CGST, SGST and IGST?
For intra-state transactions, GST is split equally into CGST (Central GST) and SGST (State GST). For inter-state transactions or imports, IGST (Integrated GST) applies at the full rate. Example: 18% on intra-state sale = 9% CGST + 9% SGST; on inter-state = 18% IGST collected centrally.
How do I remove GST from a total price?
Divide the GST-inclusive total by (1 + GST rate as a decimal). Formula: Original = Total / (1 + Rate/100). For ₹1,180 at 18% GST: Original = 1180 / 1.18 = ₹1,000. GST component = ₹1,180 - ₹1,000 = ₹180.