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Sales Tax & VAT Calculator

Add tax to a net price, or extract the tax from an inclusive price.

Input
No upload needed — instant
Privacy
Nothing is uploaded
Cost
Free · no sign-up · no watermark

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Processed entirely on your device

Everything you type or paste is handled by JavaScript running in this tab. No request is sent, nothing is logged and nothing is stored. Close the page and it is gone.

Overview

About the Sales Tax & VAT Calculator

Add sales tax or VAT to a net price to get the gross, or work backwards from a tax-inclusive price to find the net amount and the tax — in either direction.

Sales tax, VAT and GST calculators do two jobs: add tax to a net price to get the amount to charge, or strip tax out of an inclusive price to find the net. This tool does both from one rate, and it uses the correct reverse maths.

The maths

add tax:    gross = net × (1 + rate)
remove tax: net = gross ÷ (1 + rate)
tax = gross − net

Removing tax is a division, not a subtraction, because the rate applies to the net, not the gross.

Why the reverse matters

Subtracting the rate from an inclusive price overstates the tax and understates the net — a common error on invoices. Dividing by (1 + rate) gives the true net every time.

Private and precise

Every figure is worked out in your browser with standard financial formulas. Nothing you type is uploaded, stored or sent anywhere.

Step by step

How to use the Sales Tax & VAT Calculator

  1. Enter the price and choose your currency.

  2. Set the sales tax or VAT percentage.

  3. Pick whether the price is before tax or already includes it.

  4. Read the net, the tax and the gross together.

Why use it

Benefits and common use cases

What this tool is good for, and what it deliberately does not try to do.

Add or remove tax

Add tax to a net price to get the amount to charge, or strip tax out of an inclusive price to find the net — from one rate.

Correct reverse maths

Removing tax divides by (1 + rate) rather than subtracting the percentage, avoiding the mistake that quietly costs businesses money.

Any rate or regime

Sales tax, VAT or GST — the arithmetic to add or remove it from a price is identical.

Questions

Frequently asked questions

Short, honest answers about quality, limits and privacy.

How do I remove VAT from a price?

Divide the inclusive price by (1 + rate). At 20% VAT, a $120 price has a net of 120 ÷ 1.20 = $100 and $20 of tax. Subtracting 20% instead would wrongly give $96.

What is the difference between VAT, GST and sales tax?

They are all consumption taxes computed the same way for this purpose. Sales tax is usually added at the point of sale; VAT and GST are collected at each stage, but the arithmetic to add or remove them from a price is identical.