Percentage Calculator
Instantly calculate X% of any number — plus the discounted value and the total with percentage added. Three results, zero effort.
Whether it's a discount, a tip, or a tax — percentage math is the same three operations every time. Adjust the sliders and all three appear instantly.
÷ 100
The core operation: multiply by the percentage, then divide by 100 — or multiply by the decimal equivalent
3 results
X% of Y, the value minus X%, and the value plus X% — three common real-world calculations at once
Instant
Recalculates as you move the sliders — no button to press, no equals to hit
Three percentage calculations you use every day
Discounts, tips, tax — all the same math, shown all at once.
Sale price in one step
Set the percentage to the discount (e.g. 25%) and the value to the original price. The 'remainder' output is your sale price — no mental arithmetic needed. Works for any discount: 10% off, 30% off, 50% off.
Price with tax or tip
Set the percentage to your tax rate or tip (e.g. 20%) and the value to the bill amount. The 'value + percentage' output is your total including the addition. Handy for restaurant bills, invoice taxes, and contractor markups.
Quick commission and markup
Sales reps, freelancers, and retailers all work with percentages constantly — commission on a deal, markup on a cost price, agency fee on a media buy. This calculator handles any of those in under five seconds.
How the Percentage Calculator Works
Formula
Result = (Percentage / 100) × Value
Remainder = Value − Result (value after subtracting X%)
Added Total = Value + Result (value after adding X%)
Example: 20% of $500
Result = (20 / 100) × 500 = $100
Remainder = $500 − $100 = $400 ← sale price after 20% off
Added Total = $500 + $100 = $600 ← price with 20% addedSet the percentage
Drag the slider or use the quick-pick buttons — 5%, 10%, 15%, 20%, 25%, 50% are one tap.
Set the value
The base number you want to take a percentage of. Could be a price, a salary, a budget, or any quantity.
Read all three outputs
X% of the value · the value minus X% · the value plus X% — all update instantly.
Percentage calculations underlie almost every financial decision: discounts, tax rates, tips, interest rates, markups, commission. This calculator surfaces the three most useful outputs from a single percentage — so you can see the discount, the sale price, and the marked-up price in one view.
Use it for restaurant tips, VAT or sales tax, sale-price calculations, contractor markup checks, commission estimates, or any time someone quotes you a percentage and you want to know what the actual number is.
Frequently Asked Questions
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