Percentage Calculator - Calculate Percentages Online
Solve all common percentage calculations: What is X% of Y, percentage changes, discount pricing, and marks percentages.
How to use Percentage Calculator in 3 simple steps
Select Calculation Mode
Choose from 5 modes: Simple Percentage, What % is X of Y, Percentage Increase/Decrease, Discount Price, or Marks Percentage.
Enter Numbers
Input your values into the clearly labeled fields.
View Answer & Formula
See the calculated answer immediately alongside the underlying mathematical step-by-step formula.
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Five Essential Percentage Calculations in One Fast Tool
Percentages are foundational to everyday decisions: calculating retail discounts during sales, analyzing business growth metrics, evaluating test scores, or tipping at restaurants. Yet mental math formulas can be confusing or error-prone.
Toolnova Percentage Calculator organizes the five most common percentage problems into clean, intuitive cards. Whether you need to find 15% of $80, find what percentage 45 is out of 120, calculate a percentage increase from last quarter, or check final discount savings, the result appears instantly as you type.
Every calculation explicitly displays the mathematical equation used, helping students and professionals verify figures with complete transparency.
Key features & capabilities
Frequently asked questions about Percentage Calculator
Common questions about usage, privacy, limits, and browser compatibility.
How do I calculate a percentage increase?
Subtract the original value from the new value, divide the difference by the original value, then multiply by 100. A rise from 80 to 100 is a difference of 20, which is 25% of 80. The percentage change mode does this automatically and labels the result as an increase.
How do I find what percentage one number is of another?
Divide the part by the whole and multiply by 100. For example, 45 out of 120 is 45 divided by 120 times 100, which equals 37.5%. Use the What % is X of Y mode and the answer appears as you type.
How is a discount price calculated?
Multiply the original price by the discount percentage and divide by 100 to get the savings. Subtract that amount from the original price to find the final price. The discount mode shows both the amount saved and the price you pay.
How do I calculate exam marks percentage?
Divide the marks obtained by the total marks, then multiply by 100. Scoring 72 out of 90 gives 80%, since 72 divided by 90 equals 0.8. The marks percentage mode handles the arithmetic and displays the formula alongside the result.
What is the difference between percent change and percentage points?
Percent change compares a new value with an old value, while percentage points describe the simple difference between two percentages. A rate moving from 10% to 15% has risen 5 percentage points, but that is a 50% increase. Mixing the two makes changes look larger or smaller than they are.
Can the calculator handle a percentage decrease?
Enter the original and new values in the percentage change mode, and a fall is reported as a decrease, typically with a negative sign. For example, a drop from 200 to 150 is a 25% decrease. The same mode handles growth, so you can compare both directions.