🧾 Calculator Tools

Sales Tax, Discount & Margin Calculator

Add or remove sales tax and VAT, work out discounts, and price products with the right profit margin and markup — instantly and free.

Net (before tax)$100.00
Tax (20%)$20.00
Gross (total)$120.00
About this tool

Three everyday business calculations in one place

This calculator bundles the three number problems every shopper, freelancer and small business hits constantly. The Sales Tax / VAT tab adds tax to a net price or extracts the tax already baked into a gross price — essential for invoicing, expense claims and knowing the pre-tax cost of anything. The Discount tab tells you exactly what you'll pay after a percentage off, or works out the percentage discount from an original and sale price. The Margin & Markup tab prices a product for profit and clears up the single most common pricing mistake: confusing margin with markup.

Everything updates as you type, works with any currency symbol, and runs entirely in your browser — no sign-up and nothing uploaded. Whether you're reconciling a receipt, pricing a service, or checking a Black Friday deal is as good as it claims, the answer is one field away.

100% freeNo sign-upAny currencyPrivate — runs locally
How to use it
  1. 1Choose a tab: Sales Tax / VAT, Discount, or Margin & Markup.
  2. 2Pick your currency symbol and the mode (e.g. add vs remove tax).
  3. 3Enter your figures — amount and rate, price and discount, or cost and price.
  4. 4Read the breakdown instantly, including tax, savings, profit, margin and markup.
What it calculates
  • Add sales tax / VAT / GST to a net price
  • Remove (back out) tax from a tax-inclusive price
  • Final price and savings from a percentage discount
  • The discount percentage from original vs sale price
  • Selling price from a target margin or markup
  • Profit, profit margin and markup from cost and price

Frequently asked questions

What's the difference between margin and markup?
Both describe the same profit but divide it by different things. Markup is profit as a percentage of cost (profit ÷ cost); margin is profit as a percentage of the selling price (profit ÷ price). A 50% markup on a $60 cost gives a $90 price and a 33.3% margin — the numbers are always different, which is why mixing them up quietly wrecks pricing.
How do I remove sales tax from a total?
Divide the gross (tax-inclusive) amount by 1 plus the tax rate as a decimal. For 20% tax: net = gross ÷ 1.20, and the tax is the difference. The 'Remove tax' mode does this automatically — handy for invoices that only show the total.
How do I calculate a percentage discount?
Multiply the original price by the discount rate divided by 100 to get the amount saved, then subtract it. To find the percentage instead, divide the amount saved by the original price and multiply by 100. Both directions are built in.
Does this work for VAT and GST too?
Yes. VAT (Europe, UK), GST (Australia, India, Canada) and US sales tax are all simple percentage taxes, so the same add/remove math applies — just enter your local rate. Quick-pick buttons cover the most common rates.
What margin should I aim for?
It varies hugely by industry — retail often runs 30–50%, restaurants aim higher on drinks to offset thin food margins, and software can exceed 80%. The tool shows both margin and markup so you can price to whichever target your business uses.
Is my data private?
Completely. Every calculation happens in your browser; no prices, costs or figures are sent anywhere or stored.
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Full guide

Margin vs Markup & Sales Tax — The Small-Business Pricing Guide

How to price for profit, the margin/markup trap that loses money, and how to handle sales tax, VAT and discounts correctly.

Margin vs markupAdding & removing taxPricing discounts

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