Strong Password Generator
Generate strong random passwords with customizable character rules.
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Percentage Calculator
Calculate percentages, increases, and decreases quickly.
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Enter valid numbers for both values.
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Frequently asked questions
Common questions about this tool.
A percentage is a fraction out of 100: p% means p/100. Saying 25% is the same as the decimal 0.25 of a whole.
Enter the base value and the percent you need. The tool applies the standard formula and shows the result for quick copy.
Increase from A to B is typically (B − A) / A × 100%. The calculator labels inputs to match the mode you selected.
Display rounding follows the UI settings. For financial or legal work, verify rounding rules against your own policy or spreadsheet.
Moving from 5% to 7% is a 2 percentage point increase but a 40% relative increase in the rate. Context matters in finance and statistics.
Tip is a percent of the pre-tax bill; tax is a percent of taxable amount. Compounding order (tax then tip or vice versa) depends on locale and policy.
Compound applies percent to an updated balance each period (exponential). Simple percent off a fixed base grows linearly; investments often compound.
Two successive 10% discounts are not 20% off: the second applies to the reduced price. Sequential percents multiply as (1−d1)(1−d2), not add.
Markup is percent profit over cost; margin is profit over selling price. They use different denominators—do not interchange the formulas.
A ratio a:b can be expressed as a/(a+b)×100% and b/(a+b)×100%. Percentages normalize comparisons when baselines differ, common in analytics and grades.