# GST / VAT Calculator Add or remove GST / VAT / sales tax at any rate — see the net amount, the tax, and the gross total. Quick rate presets and live results, all in your browser. ### How it works **Adding** tax multiplies the net amount by the rate to get the tax, then adds it for the gross. **Removing** tax works backwards: the amount you enter already includes tax, so the net is gross ÷ (1 + rate), and the tax is the difference. The same maths covers GST, VAT and sales tax — only the rate changes. --- *Source: [ocxly.com/gst-vat-calculator.html](https://ocxly.com/gst-vat-calculator.html) — OCXLY, free 100% client-side privacy-first tools. Free GST / VAT / sales tax calculator. Add or remove tax at any rate and see the net amount, tax and gross total, with quick rate presets. Runs entirely in your browser.*