PercentMaster

PercentMaster とは？

PercentMaster is a free, mobile-friendly collection of calculators and small utilities—percentages, interest, tips, discounts, loans, tax estimates, BMI, GPA, salary, and more—plus helpers like JSON format, Base64, UUIDs, image compression, and unit/date tools. Everything runs in the browser with readable explanations and optional guides, so you get the number and the logic behind it.