About the Percentage Calculator

Percentages are everywhere — discounts, tips, taxes, grade scores, statistics, financial returns, and business metrics all rely on percentage math. Our Percentage Calculator handles the four most common percentage problems in one place, with clear explanations of each calculation so you understand the answer, not just the number.

Whether you're checking whether that "40% off" sale is actually a good deal, calculating a tip at a restaurant, figuring out your grade percentage, or analyzing a business metric's change over time, this tool does it instantly.

How It Works

Choose the type of percentage calculation you need: (1) What is X% of Y? (2) X is what percent of Y? (3) What is the percent change from X to Y? (4) What is X% more/less than Y? Enter your values and get an instant answer with a step-by-step explanation.

Formula / Key Reference

What is X% of Y?: Result = (X ÷ 100) × Y
X is what % of Y?: Result = (X ÷ Y) × 100
% Change from X to Y: Result = ((Y − X) ÷ X) × 100
X increased/decreased by Y%: Result = X × (1 ± Y ÷ 100)

Real-World Example

Scenario: You're shopping during a sale and see three calculations you need:

1. A $149.99 jacket is 35% off. What do you pay?

35% of $149.99 = $52.50 discount

Sale price = $149.99 − $52.50 = $97.49

2. The original price was $80. It's now $96. What's the percent increase?

% change = (96 − 80) ÷ 80 × 100 = 20% increase

3. You earned $52,000 last year and $56,500 this year. What was your raise?

% change = (56,500 − 52,000) ÷ 52,000 × 100 = 8.65% raise

Three common real-life scenarios, all solved in seconds.

Common Uses

  • Calculating discounts and sale prices when shopping
  • Computing restaurant tips (15%, 18%, 20%)
  • Finding percent change in sales, revenue, or any business metric
  • Converting raw test scores to percentage grades
  • Calculating tax amounts (sales tax, VAT, income tax percentage)

Frequently Asked Questions

What is the difference between percentage points and percent? ▼
This is a critical distinction. If interest rates rise from 5% to 7%, they rose by 2 percentage points — but by 40% in relative terms (2 ÷ 5 × 100 = 40%). Politicians and media often confuse these. Percentage point changes describe absolute differences between percentages; percent change describes the relative change.
How do I calculate a tip quickly in my head? ▼
For 20%: move the decimal one place left (10%), then double it. So on a $43 bill: 10% = $4.30, doubled = $8.60 for 20%. For 15%: find 10%, then add half of that: $4.30 + $2.15 = $6.45. For 18%: find 20% and subtract 10% of that: $8.60 − $0.86 = $7.74.
What does ****'****basis points****'**** mean? ▼
One basis point (bps) = 0.01% = one-hundredth of a percent. Basis points are used in finance to describe interest rate changes precisely. When the Fed raises rates by '25 basis points,' it raised rates by 0.25%. This terminology avoids ambiguity between percentage points and relative percent changes.