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Percentage, Discount & Tax Calculator

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Percentage change, discounts and stacked discounts, VAT and sales tax in either direction, tip and bill splitting, and unit price comparison in one calculator

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About Percentage, Discount & Tax Calculator

The everyday percentage questions in one place: how much did a number go up or down, what does an item cost after a discount (or two stacked discounts, which is not the same as adding them), what is a price with VAT or sales tax added or removed, how much to tip and what each person owes, and which package size is actually cheaper per unit. Each mode solves in whichever direction you need, for example finding the discount percent from the original and sale price, or the net price from a VAT-inclusive one. Results update as you type and nothing leaves your browser.

How to use Percentage, Discount & Tax Calculator

  • 1.Pick a mode: Percentage change, Discount, VAT / sales tax, Tip & bill split, or Unit price.
  • 2.Enter the numbers you have; each mode solves for the rest, for example the sale price and amount saved from an original price and a discount percent.
  • 3.For stacked discounts, add each one in order; the Discount mode applies them one after another and shows the true combined percentage.
  • 4.In Unit price, add two or more package options with their price and quantity to see the cost per unit and which one is cheapest.

Frequently asked questions

How do I calculate percentage change?
Subtract the old value from the new value, divide by the old value and multiply by 100. Going from 80 to 100 is a 25% increase; going from 100 to 80 is a 20% decrease.
Why is 20% off then 10% off not 30% off?
The second discount applies to the already reduced price: 0.8 × 0.9 = 0.72, so the combined discount is 28%, not 30%.
How do I remove VAT from a price?
Divide the gross price by 1 plus the rate. At 20% VAT, a 120 price is 120 / 1.2 = 100 net, not 120 minus 20%. The VAT mode does this in either direction.
Is anything stored or sent?
No. All calculations run in your browser.
Why did an old Utilix tool page redirect me here?
Utilix merged several single-purpose tools into the Percentage, Discount & Tax Calculator. Each old URL now opens this page with its mode preselected (via ?mode=<old-tool-slug>), so bookmarks and links keep working. The old tools' REST endpoints, Node.js and Python SDK functions, and MCP tools are unchanged.

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