Percent Calculator
Calculate percentages, percentage change, percent increase, and percent decrease in one clean workspace.
Clean percentage calculations
Built for everyday math, quick comparisons, and trading workflows.
Quick results
Instant answers as you type
Multiple modes
Percent, reverse percent, and change
Trader friendly
Great for sizing and quick scenario checks
Simple and clean
Easy on desktop and mobile
What is X% of Y?
Find the value of a percentage of a number.
Answer
10% of 500 is 50
X is what percent of Y?
Reverse the calculation to find the percentage.
Answer
50 is 10% of 500
Percentage change
Measure the percent increase or decrease from one number to another.
Answer
100 → 120 is 20% increase
Increase a number by X%
Quickly add a percentage increase to a base number.
Answer
200 increased by 15% is 230
Frequently asked questions
How do you calculate a percentage of a number?
Divide the percent by 100, then multiply by the number. For example, 10% of 500 = 0.10 × 500 = 50.
How do you find what percent one number is of another?
Divide the first number by the second number, then multiply by 100.
How do you calculate percent increase or decrease?
Subtract the starting value from the ending value, divide by the starting value, then multiply by 100.
How do you increase a number by a percentage?
Multiply the number by 1 plus the percentage divided by 100. For example, 200 increased by 15% = 230.
Explore More Calculators
Percent Change Calculator
Calculate the percentage change between an original and a new value. Shows whether the change is an increase or decrease, plus the absolute difference.
Calculate now →Percent Increase Calculator
Calculate the percentage increase between two numbers. Enter a starting and ending value to see the % increase and the absolute difference.
Calculate now →What is X Percent of Y Calculator
Quickly find what X% of any number Y equals. Enter a percentage and a value to get the result instantly — no mental math required.
Calculate now →Percentage Difference Calculator
Calculate the symmetric percentage difference between two values. Uses the average as the denominator — ideal when neither value is the clear baseline.
Calculate now →