Simple tools, clear maths
PercentWise is a focused collection of free percentage calculators designed to make common percentage calculations quick and understandable. Instead of forcing every question into one generic form, each calculator is built around a specific task and shows the formula behind the result.
Privacy-first calculations
The calculator arithmetic runs locally in your browser. The numbers you enter into the calculators are not sent to a PercentWise calculation server.
Accuracy and scope
PercentWise is intended as a general arithmetic resource. We aim to keep formulas, examples and calculator logic clear and accurate, but specialized legal, tax, financial, academic or professional rules can vary by context.
Accuracy and methodology
Every calculator publishes its formula and examples. For details on rounding, validation, privacy and limitations, see our Calculation Methodology and Percentage Formulas reference.