Percentage Calculator
Calculate percentages, ratios, and percentage changes instantly.
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How to Use the Percentage Calculator
Pick the tab that matches your question, enter your numbers, and click Calculate. Here are two quick examples:
Example 1 — Restaurant tip
You want to leave a 20% tip on a $65 bill. Select the "% of Value" tab, enter 20 and 65. Result: $13.00 tip, so you pay $78 total.
Example 2 — Sale discount
A $120 jacket is on sale for $84. Select the "% Change" tab, enter 120 (original) and 84 (new). Result: −30% — the jacket is 30% off.
Percentage Formula Explained
Percentage = (Part ÷ Whole) × 100
This formula answers the question: "What fraction of the whole is the part, expressed out of 100?" For example, if you scored 45 out of 60 on a test, the calculation is (45 ÷ 60) × 100 = 75%. That means you got 75% of the questions right.
Common Uses for Percentages
Discounts
Retailers use percentages to show how much you save. A 25% discount on a $80 item means you save $20 and pay $60.
Markups
Businesses add a percentage to their cost price to set a selling price. A 40% markup on a $50 product means it sells for $70.
Interest Rates
Banks and lenders express interest as a percentage of the loan or deposit amount — for example, a 5% annual interest rate on a $1,000 loan means you owe $50 in interest per year.
Test Scores
Grades are often shown as a percentage. If you answer 38 out of 50 questions correctly, your score is 76%.
FAQs
How do I calculate a percentage?
Divide the part by the whole, then multiply by 100. For example, to find what percentage 30 is of 120: (30 ÷ 120) × 100 = 25%.
How do I find a percentage increase?
Subtract the original value from the new value, divide by the original value, then multiply by 100. Example: a price goes from $40 to $50 — that's a 25% increase.
How do I find a percentage decrease?
Subtract the new value from the original value, divide by the original value, then multiply by 100. Example: a price drops from $80 to $60 — that's a 25% decrease.
What is 20% of a number?
Multiply the number by 0.20 (or divide by 5). For example, 20% of 350 = 350 × 0.20 = 70. You can also use the '% of Value' tab above to calculate this instantly.