Percentage Calculator
A fast, free tool for calculating percentages, reverse percentages, and percentage change.
Use it to find percent of a number, work out what percent one value is of another, and calculate percentage increase or decrease. Ideal for discounts, price comparisons, quick checks, and everyday math.
Tip: Press Tab to move forward, Shift+Tab to move back. Hit Enter to calculate.
About
Use this calculator to answer common percentage questions in seconds, like finding a discount, working out a share of a total, or measuring how much a value has moved up or down. It is also useful for quick sanity checks when comparing prices, margins, or performance. SharkBetting builds practical calculators that help you make clearer, more informed decisions.
FAQ
A percentage tells you how many parts out of 100 something represents. It is a simple way to describe a share, a rate, or a change. For example, 25 out of 100 equals 25%.
Most of the time you can use: (part ÷ whole) × 100. Example: if 20 out of 50 apples are red, 20 ÷ 50 = 0.4, and 0.4 × 100 = 40%.
Percentages make it easy to compare things on the same scale, whether you are looking at discounts, fees, growth, or performance over time. They are also common in betting and trading where you want to think in rates and risk rather than raw numbers.
Use: ((new − old) ÷ old) × 100. Example: from 80 to 100 is ((100 − 80) ÷ 80) × 100 = 25%.