Percentage Calculator
Quickly work out a tip, a discount, a price change, or a markup — five percentage tools on one page.
What is X% of Y?
18% of 50 is 9.
Results update as you type.
Formula
Each tab uses a single one-line formula:
- % of:
result = (percent / 100) × value - What %:
percent = (part / whole) × 100 - % change:
percent = ((to − from) / from) × 100 - Add / Subtract %:
result = value × (1 ± percent / 100) - Reverse %:
original = result / (percent / 100)
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Frequently asked questions
How do I calculate a tip?▾
Use the % of tab. Enter the tip rate as the percent and your bill as the value. For an 18% tip on $50, the calculator returns $9. To see the total bill including tip, switch to Add/Subtract % and add 18% to $50 — the result is $59.
How do I work out a percentage discount?▾
Use the Add/Subtract % tab. Enter the original price as the value, the discount as the percent, and choose 'subtract'. For example, 25% off $80 is $80 − 25% = $60, with $20 in savings.
What's the difference between percentage and percentage points?▾
A percentage is relative; a percentage point is absolute. Moving from a 5% interest rate to 8% is a 3 percentage-point increase but a 60% relative increase. The % change tab here works in relative terms.
How do I reverse a percentage to find the original price?▾
Use the Reverse % tab. If $60 represents 75% of the original price (after a 25% discount), the original was $60 ÷ 0.75 = $80.
Does this calculate sales tax?▾
It can — enter your sales-tax rate in the Add/Subtract % tab and choose 'add'. Because rates vary by state and locality, our dedicated Sales Tax Calculator (coming soon) will let you choose by state.