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Calculate a Percentage Increase

Add a percentage to an amount: VAT, salary raise, markup. Instant result.

Add a percentage to a number

What is Y increased by X%?

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Adding 20% means multiplying by 1.20. The "1" is the starting number, the "0.20" is the percentage. Tip: for 20% VAT, always multiply by 1.20. 5.5% VAT? Multiply by 1.055.
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Calculate a Percentage of a Number

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How to add a percentage to a number

Adding a percentage to a number is an essential everyday operation. It's used to calculate a price including VAT from a pre-tax price, estimate a salary after a raise, or apply a markup to a quote. The formula is: Result = Number × (1 + Percentage / 100).

Let's take a concrete example: adding 20% VAT to €500 before tax. The calculation is 500 × 1.20 = €600 including tax. The multiplying factor "1.20" means you keep 100% of the original amount and add 20%. For 10% VAT, multiply by 1.10; for 5.5%, by 1.055.

This calculator is especially useful for professionals preparing quotes, employees wanting to estimate their salary after an annual raise, or anyone calculating a price after a markup. Results are displayed in real time, and the calculation is performed locally in your browser.

Frequently asked questions

Multiply the pre-tax price by the VAT factor. For 20% VAT: price × 1.20. For 10%: price × 1.10. For 5.5%: price × 1.055. Example: €100 before tax × 1.20 = €120 including tax.
The formula is: Result = Number × (1 + Percentage / 100). For example, increasing 1,500 by 3%: 1,500 × 1.03 = 1,545.
Multiply your current salary by 1.03. For example, if you earn €2,000 net: 2,000 × 1.03 = €2,060 net. The raise represents €60 per month.
France applies 4 VAT rates: 20% (standard rate, most goods and services), 10% (intermediate: restaurants, transport), 5.5% (reduced: food, energy) and 2.1% (super-reduced: reimbursed medicines, press).