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Percentage Calculator
Handle percentage-of, reverse percentage, percentage change, and increase or decrease calculations instantly.
percentage calculatorpercent calculatorpercentage change calculatorpercentage of a number
Mode 1
What is X% of Y?
Result
30
Mode 2
X is what % of Y?
Result
15%
Mode 3
Percentage change from X to Y
Result
25% increase
Mode 4
Increase or decrease X by Y%
Increase result
168
Decrease result
132
How to use
How to use the percentage calculator for ratios, changes, and price adjustments
- 1 Use the first card when you want to know the value of a percentage, such as 15% of 200.
- 2 Use the second card when you have two numbers and need to know what percentage one number represents of the other.
- 3 Use the percentage change card to measure growth or decline between a starting value and a new value.
- 4 Use the increase and decrease card to project new totals after raising or lowering a number by a percentage.
- 5 Type directly into any input and watch the results update instantly without needing a separate submit button.
Percentage math appears in shopping, budgeting, analytics, finance, schoolwork, and everyday problem solving. A dedicated calculator saves time because it keeps several common formulas together instead of forcing you to remember or re-enter each one separately. With four modes on one screen, it becomes easier to move between discounts, comparisons, and rate-of-change questions quickly.
Live updates are especially helpful when you are exploring scenarios rather than checking a single result. You can adjust a percentage, change a starting value, or compare two new numbers and immediately see how the answer changes. That makes the calculator useful for quick decisions, spreadsheet spot checks, and homework-style percentage problems alike.
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