Free online percentage calculator: calculate discounts, percent increase/decrease, and fractions instantly.
Percentages express proportions as fractions of 100. Learn how to find a percentage of any number, calculate percentage changes, and how to use the percent key on any calculator.
To find a percentage of a number, divide the percentage by 100 to convert it into a decimal rate, then multiply it by the total number. For example, to find 20% of 150: 20 ÷ 100 = 0.20, then 0.20 × 150 = 30.
On standard handheld or mobile calculators: 1) To find X% of Y, type Y × X % (e.g. 150 × 20 % outputs 30). 2) To add a percentage (like tax or tip), type Price + Rate % = (e.g. 100 + 15 % = 115). 3) To apply a discount, type Price - Discount % = (e.g. 80 - 25 % = 60).
A Percent Finder is an all-in-one calculator that solves multiple percentage calculations: finding a percentage of a total, calculating what percentage one number is of another, calculating percentage increase/decrease, finding discount prices, and solving reverse percentage problems.
Subtract the original value from the new value, divide the difference by the original value, and multiply by 100. A positive result indicates a percentage increase, while a negative result indicates a percentage decrease.
Divide the specific part by the total whole, then multiply by 100. For example, if you got 45 questions right out of 60 on a test: (45 ÷ 60) × 100 = 0.75 × 100 = 75%.
Percentage Finder · Math · percent · fraction · discount