Effortlessly add or remove tax from any amount with professional precision.
The GST / VAT Calculator by GrowthSyntax is a free, browser-based tax tool that works in two modes — adding tax to a base price (exclusive tax calculation) or removing embedded tax from a tax-inclusive total (reverse tax calculation). Enter your amount and tax rate, and instantly see the base price, tax amount, and total price with a visual breakdown — useful for GST, VAT, sales tax, or any percentage-based consumption tax.
In Add Tax mode, you enter the base price before tax and the tax rate. The calculator adds the tax on top of the base price to give you the final tax-inclusive total. For example, if your base price is $100 and the GST rate is 18%, the tax amount is $18 and the final price is $118. This is the most common calculation needed for invoicing, pricing products, and preparing quotes where you need to show tax separately on a receipt or invoice.
In Remove Tax mode, you enter a tax-inclusive total and the tax rate, and the calculator works backwards to extract the embedded tax and show you the pre-tax base price. For example, if you paid $118 inclusive of 18% GST, the actual base price was $100 and the tax was $18. This calculation is essential for accounting, expense reporting, input tax credit claims, and situations where you received a tax-inclusive price and need to separate the components.
Switch between Add Tax (exclusive) and Remove Tax (inclusive/reverse) modes with one click — covering both the most common tax calculation scenarios in one tool.
Enter any custom tax rate — whether GST at 5%, 12%, 18%, or 28%, VAT at 20%, sales tax at 8.5%, or any other regional consumption tax rate — the formula is universal.
See base price, tax amount, and total price displayed separately — giving you a clean, invoice-ready breakdown of every price component at a glance.
An animated progress bar shows the percentage split between base price and tax — visually demonstrating what portion of any total is tax at the given rate.
Labels in the results panel automatically update to match the selected mode — ensuring the output is always clearly labelled as either adding or removing tax.
The GST / VAT Calculator runs entirely in your browser. No financial data is sent to any server — your prices and tax figures stay completely private.
Stop manually calculating GST, VAT, and sales tax with formulas or spreadsheets. Use the GST / VAT Calculator by GrowthSyntax to add or remove any tax rate from any amount — completely free, instantly accurate, and always private.