informational guide · Updated 2026-08-12
Percentage basics
Learn percent-of, percent change, discounts, and marks percentage with Utila’s free calculator.
Percent of
A percentage expresses a part per hundred. “What is 18% of 2,450?” multiplies the whole by 0.18.
Percent change
Percent change compares old and new values: ((new − old) / old) × 100.
Discounts
Discounts subtract a percent from a price. Watch stacking rules—marketing “up to” language can mislead.
Marks
Marks percentage is obtained ÷ total × 100. Confirm whether grace marks are included.
Primary tool: Percentage Calculator
