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Free GST Calculator Online – India GST Calculation

GST Calculator computes GST online for free. Find GST inclusive and exclusive amounts for Indian tax rates.

Mode

Tax Type

Base Amount

₹1,000.00

GST (18%)

₹180.00

Total Amount

₹1,180.00

Tax Breakdown

CGST (9%)₹90.00
SGST (9%)₹90.00

How to Use GST Calculator

1

Enter Price

Enter the base price (excluding GST) or the total price (including GST).

2

Select GST Rate

Choose the applicable GST rate: 5%, 12%, 18%, or 28%.

3

Calculate

Click Calculate to see GST amount, CGST, SGST, and total price instantly.

Calculate GST for Any Indian Tax Rate Instantly

The Helperzy GST Calculator works out Goods and Services Tax for every Indian tax slab: 5 percent, 12 percent, 18 percent, and 28 percent. It runs in two directions. In the add-GST mode you enter a base price and it shows the tax amount and the final price including GST. In the remove-GST mode you enter a GST-inclusive total and it works backwards to reveal the original price before tax. It also splits the tax into CGST and SGST for transactions within a state, or shows IGST for inter-state sales. The math is simple but worth understanding. To add GST, you multiply the base price by the rate and divide by 100, then add it back. To remove GST from an inclusive amount, you divide the total by (1 plus the rate as a decimal) to get the base, and the difference is the tax. For example, a 1000 rupee item at 18 percent becomes 1180, and reversing 1180 at 18 percent returns 1000. This is useful for shop owners preparing invoices, freelancers billing clients, small businesses filing returns, and shoppers who want to know how much tax sits inside a marked price. Knowing the base and tax separately also helps when you claim input tax credit or reconcile your accounts at the end of a period. Keep a few points in mind. CGST and SGST are each half of the total GST rate for intra-state supply, while a single IGST applies for sales across state lines. The correct rate depends on the specific goods or service and its HSN or SAC code, and rates can change when the GST Council revises them. This tool gives accurate arithmetic for the rate you select, but it is a calculation aid, not tax or legal advice. For filing, classification, or compliance questions, confirm the applicable rate and consult a qualified chartered accountant or tax professional.

Frequently Asked Questions – GST Calculator

Enter the base price and select the GST rate — 5%, 12%, 18%, or 28% — in Helperzy GST Calculator, then click Calculate to see the GST amount and the final price including tax. You can also switch to remove-GST mode to work backwards from an inclusive total. The calculation is instant and runs entirely in your browser.