Percentage Calculator

Instant percentage calculations for discounts, tips, increases, decreases, and markups. All common formulas with live results.[web:537][web:538][web:539]

Recent
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Mode
what percent
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Recent calculations

Your recent calculations appear here.
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Common percentage calculations

Percentage calculators handle everyday math like discounts (20% off $150), tips (18% of $42), sales increases, or test scores.[web:537][web:538][web:544]

Quick formulas

  • What is X% of Y? (X/100) × Y — 15% of 200 = 30[web:541]
  • X is what % of Y? (X/Y) × 100 — 30 is 15% of 200[web:539]
  • Increase/Decrease: ((new-old)/|old|) × 100 — $100 to $120 = +20%[web:542][web:545]
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