Enter values and select Calculate to see your result.
Percentages & Percentage Change
Use this percentage calculator for quick everyday percentage problems, including discounts, markups, exam scores, and business metrics.
View formula
Percentage = (Part ÷ Whole) × 100
How to use the Percentage Calculator
Solve common percentage questions, including a percent of a number and percentage change.
- Enter the part and whole values.
- Use the relevant percentage mode.
- Calculate the percentage, amount or change.
Percentage Calculator formula
Percentage = (part ÷ whole) × 100; change = ((new − old) ÷ old) × 100.
Worked example
Inputs: 25% of 240 is 60; 80 to 100 is a 25% increase.
What to expect: The result identifies the requested percent or amount and keeps change direction visible.
How to read your result
A percentage is relative to its reference value; state the baseline clearly.
Frequently asked questions
How is percentage increase calculated?
Subtract old from new, divide by old and multiply by 100.
Can percentage change be negative?
Yes. A negative result means the new value is lower than the baseline.