Percentages Made Simple
Percent means 'per hundred'. To find a percentage of a number, multiply by the percentage and divide by 100: 15% of 80 is 80 × 15 ÷ 100 = 12. To find what percent one number is of another, divide and multiply by 100: 12 out of 80 is 15%. The percentage calculator handles all of these.
Percentage change compares a new value with an old one: (new − old) ÷ old × 100. A price that rises from $50 to $60 has increased by 20%. The percentage change calculator also shows percentage difference, which compares two values without treating either as the starting point.
Fractions and Ratios
To add fractions, rewrite them over a common denominator first: 1/3 + 1/4 = 4/12 + 3/12 = 7/12. The fraction calculator works with proper fractions, improper fractions and mixed numbers, simplifies the answer and shows each step.
Ratios compare quantities. Simplify a ratio by dividing both parts by their greatest common factor (12:18 becomes 2:3), and scale it by multiplying both parts by the same number. The ratio calculator solves missing values such as 3:4 = x:20, and is handy for recipes, mixing, maps and screen aspect ratios.
Averages and Scientific Functions
A weighted average multiplies each value by its weight, adds the results and divides by the total weight. If an exam worth 60% scores 70 and an assignment worth 40% scores 85, the weighted average is 0.6 × 70 + 0.4 × 85 = 76. The weighted average calculator does this for any number of items.
For trigonometry, logarithms, exponents, roots and brackets, the scientific calculator follows the standard order of operations and lets you switch between degrees and radians.