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Our percentage calculator handles four of the most common percentage problems instantly. Whether you need to find what 15% of 200 is, determine what percentage 30 is of 200, calculate percent change between two values, or figure out a discount or markup — all four tools are on this page.
Percent of a Number: Type the percentage and the base number. The result appears immediately. Example: 20% of 350 = 70. This is used for calculating sales tax, tips, discounts, and commission.
Percent Change: Enter the starting value and ending value to see the percentage increase or decrease. Formula: ((New − Old) / Old) × 100. A stock rising from $50 to $65 is a 30% increase.
Discount & Markup: Enter the original price and percentage. The calculator shows both the discounted price and the marked-up price simultaneously — useful for retail pricing and sales events.