Use the calculators for quick results and the guides to avoid common percentage and shopping-math mistakes.
Start with a calculator
Percentage CalculatorFind percentages, changes and reverse percentages.Discount CalculatorCalculate sale prices and savings.Sales Tax CalculatorEstimate tax and final price.Tip CalculatorCalculate tips and split totals.Price per Unit CalculatorCompare package prices using cost per unit.Markup and Margin CalculatorCalculate selling price, markup and gross margin.Grade Percentage CalculatorCalculate a score percentage and general letter grade.Time Duration CalculatorCalculate elapsed time between two times.Business Days CalculatorCount weekdays between two dates, excluding weekends.
Learn with practical guides
Master PercentagesLearn the core formulas with practical examples.Coming soon: Percentage Change vs Percentage PointsUse the correct measure and label.Coming soon: Why Discounts Do Not Simply AddCombine sequential discounts accurately.Coming soon: Sales Tax and DiscountsUnderstand the taxable base and calculation order.
Fynzo calculators provide educational estimates. Check current official information and qualified professional advice for important financial or health decisions.