Percentage Calculator

To find what percentage X is of Y, divide X by Y and multiply by 100. For example, to find what percentage 25 is of 200: (25 / 200) × 100 = 12.5%. Use the "X is what % of Y?" calculator above for instant results.

To calculate percentage change from an old value to a new value, subtract the old value from the new value, divide by the absolute value of the old value, and multiply by 100. Formula: ((New - Old) / |Old|) × 100. Positive results indicate an increase, negative results indicate a decrease.

To increase a number by a percentage, multiply the number by (1 + percentage/100). To decrease, multiply by (1 - percentage/100). For example, to increase 100 by 20%: 100 × 1.20 = 120. To decrease 100 by 20%: 100 × 0.80 = 80. Use the % Increase or % Decrease calculator above for automatic calculations.

To calculate X% of Y, convert the percentage to a decimal by dividing by 100, then multiply by Y. Formula: (X / 100) × Y. For example, 15% of 200 = (15 / 100) × 200 = 30.

Dewx offers 5 specialized percentage calculators in one tool, shows the formula used for each calculation, and provides instant real-time results. Beyond free tools, Dewx is a complete business operating system with CRM, automation, unified inbox, and AI assistance, perfect for professionals who need more than basic calculations.