About Percentage Calculator

Eight percentage calculation modes in one tool: find X% of Y, determine what percent X is of Y, calculate percentage change between two values, apply percentage increase or decrease, find the whole from a part and percentage, compute tips, and calculate discounts. Each mode shows the numeric result, the formula used, and a plain-English explanation. Results update as you type.

• Eight modes: percentage of, what percent, percentage change, increase, decrease, find whole, tip, discount
• Tip calculator shows tip amount and total with tip
• Discount calculator shows savings and final price
• Real-time calculation with formula and explanation display
• Copy numeric result to clipboard
• Common examples panel for quick reference

Frequently Asked Questions

What is the difference between percentage change and percentage increase?

Percentage change takes two values and tells you the percent difference (positive or negative). Percentage increase takes an original value and an increase rate, then returns the new value. Change measures what happened; increase applies what you want to happen.

What is the formula for percentage change?

Percentage change = ((new value - old value) / old value) x 100. A positive result means an increase, negative means a decrease. The calculator handles both directions and shows the absolute change alongside the percentage.