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Percent Calculator · Blog

Articles about Percent Calculator

Discounts, percent change, ratios, and tips — the four everyday percent situations in one tool.

Guides with source and review records

Explore the examples and sources, then try the matching tool. Review records document AI-assisted checks; they are not a guarantee of accuracy or human specialist review.

Percentages are taught in school but tripped over in daily life, because each situation uses a different formula. A sale price, a year-over-year change, a pass rate, and a stacked coupon are not the same calculation. This category separates the four cases — "P% of X", "ratio (%)", "percent change", and "discounted price" — and clears up the percent-versus-percentage-point confusion that shows up constantly in news reporting.

What this category covers

  • Discounts and stacked coupons — 30% off, then an extra 10%
  • Percent change — year-over-year, and reading the sign
  • Ratio (%) — completion rate, market share, pass rate
  • Percent vs percentage point — rates and polls in the news

Primary sources

  • FTC — guidance on deceptive pricing and discount claims
  • U.S. Bureau of Labor Statistics — how percent change is reported in the CPI
  • Consumer Financial Protection Bureau — reading rates and APR

Want to use the tool directly? Head to Percent Calculator. Guides with source and review records appear above; earlier articles are kept separately.