Percentage Calculator
Calculate percentages, percentage increases/decreases, and values. Fast, free, and fully client-side.
Calculator Inputs
How the Percentage Calculator Works
Percentage calculations express ratios and fractional amounts as parts of 100. Whether calculating retail discounts, sales tax, tipping at restaurants, or financial percentage increase and decrease, percentages provide a standard scale to compare proportional values.
Formula
P = (Part / Whole) × 100 or Amount = (Percentage / 100) × Total
Where P is the percentage rate, Part is the subset quantity, and Whole is the reference base value.
Calculation Example
If a jacket originally priced at $80 is on sale with a 25% discount: Discount Amount = (25 / 100) × 80 = $20, resulting in a final price of $60.
Frequently Asked Questions
How do you calculate percentage increase or decrease?
Subtract the original value from the new value, divide by the original value, and multiply by 100.
How do you find what percent X is of Y?
Divide X by Y and multiply the result by 100: (X / Y) * 100.