GST Calculator

This GST calculator adds goods and services tax to a net price or extracts the GST already included in a gross price. Pick a preset rate — India’s 5%, 18% or 40% slabs, Australia’s 10%, New Zealand’s 15%, Canada’s 5% GST or 13–15% HST, Singapore’s 9% — or type any custom rate, and it returns the net amount, the tax and the GST-inclusive total.

It is built for shop owners pricing products, freelancers raising invoices, accountants checking bills and shoppers who want to know how much tax is inside a receipt. For Indian rates it also splits the tax into CGST and SGST for intra-state supplies (half each); for inter-state supplies the full amount is charged as IGST.

India’s rates reflect the GST rate rationalisation that took effect on 22 September 2025, which replaced most 12% and 28% slabs with the 5% and 18% rates and introduced a 40% rate for luxury and sin goods. Tobacco products such as cigarettes and beedi were left on their earlier rates and compensation cess until a date to be notified, and rates for specific goods vary, so check the official schedule for your product; the custom option covers any rate not listed. Nova Scotia’s HST fell from 15% to 14% on 1 April 2025, and amounts are shown in the currency of the country you pick.

To add GST, multiply the net price by the rate (as a decimal) to get the tax, and add it to the net price. To remove GST from a tax-inclusive price, divide the total by one plus the rate to get the net price; the GST is the difference. At 10% that means GST is one-eleventh of the total, and at 18% it is 18/118 of the total.

In India, GST on a supply within the same state is split equally between central GST (CGST) and state or union territory GST (SGST/UTGST); inter-state supplies attract integrated GST (IGST) at the full rate. The calculator rounds only for display, so totals may differ by a paisa or cent from invoices that round each line.