Percentage Calculator
Three powerful percentage calculators in one. Find any percentage instantly — no mental math required.
What is X% of Y?
e.g. What is 15% of $85? → Find a discount, tip, tax amount, or commission.
X is what % of Y?
e.g. 25 is what % of 200? → Find a score, ratio, or market share percentage.
Percentage Change
e.g. Price went from $120 to $90 — what's the % decrease? → Track growth, price changes, or performance.
Common Percentage Quick Reference
Enter a base number to see common percentages at a glance:
| Percentage | Result | Common Use |
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How to Calculate Percentages in 2026
Percentages appear everywhere — discounts, taxes, tips, salary raises, test scores, investment returns, and statistics. This free percentage calculator covers all three core percentage problems with real-time results, so you never have to reach for a pen or struggle with the formula again.
The Three Percentage Formulas
Finding X% of Y: Multiply Y by X/100. Example: 20% of $350 = 350 × 0.20 = $70. Finding what % X is of Y: Divide X by Y and multiply by 100. Example: 45 out of 180 = (45/180) × 100 = 25%. Percentage change: ((New − Old) / Old) × 100. Example: Price rising from $80 to $100 = ((100−80)/80) × 100 = +25%.
Percentage Increase vs Percentage Decrease
A positive percentage change means an increase; negative means a decrease. Note that a 50% decrease followed by a 50% increase does NOT return you to the starting point — you end up at 75% of the original. A $100 item drops to $50 (−50%), then rises 50% to reach only $75. This asymmetry is crucial for understanding investment losses.
Real-World Applications
Retailers mark up wholesale prices by 50–200%. A 30% off sale on a $120 item saves $36. A salary increase from $60,000 to $67,500 is a 12.5% raise. A test score of 78/90 is 86.7%. Understanding percentages fluently helps you evaluate deals, negotiate pay, and interpret data critically.