% Percentages
Find percentages, increases, decreases, and discounts.
A percentage is a share of 100 — the everyday language of prices, grades and growth. The tools below cover every direction: increase a number, cut it, measure the move between two values, or work backwards from a share to the whole.
- Percentage CalculatorCalculate percentage of a value
- Percentage Increase CalculatorIncrease a value by a percentage
- Percentage Decrease CalculatorDecrease a value by a percentage
- Percentage Change CalculatorPercentage change between two values
- Reverse Percentage CalculatorFind the whole from a part and its percentage
Frequently asked questions
How do percentages relate to decimals and fractions?
Move the decimal point two places to convert: 25 percent is 0.25 as a decimal and 1/4 as a fraction. Each form has a job — fractions stay exact in mental math, decimals add cleanly, and percentages communicate the share directly.
Which percentage calculator fits my problem?
Growing or shrinking a number: the percent increase and decrease tools. Measuring a move between two values: percent change. Recovering the original amount from a known share: reverse percentage. Price tags: discount. Pick the tool that names your exact question.
What common percentage mistakes should I avoid?
Three appear constantly: mixing up of versus off in store language, adding two successive percentage changes instead of compounding them, and dividing by the new value when the change should divide by the old one. Checking the base value catches all three.