Percentage Calculator

Four common percentage calculations — results update instantly.

What is X% of Y?

e.g. What is 20% of 150? → 30

What is% of?

X is what % of Y?

e.g. 30 is what % of 150? → 20%

is what % of?

Percentage change

e.g. from 80 to 100 → +25%

Fromto

Increase / decrease by %

e.g. 200 increased by 15% → 230 / decreased → 170

by%

About the Percentage Calculator

Percentages show up everywhere — discounts, tax, tips, test scores, interest rates, budgets. This calculator covers the four most common percentage questions, so you never have to remember the formula.

The four calculations explained

X% of Y = (X ÷ 100) × Y

X is ?% of Y = (X ÷ Y) × 100

% change = ((New − Old) ÷ |Old|) × 100

Increase by X% = Number × (1 + X ÷ 100)

Real-world examples

🛍️20% off a $85 item → 20% of 85 = $17 discount → you pay $68
📈Stock went from $120 to $156 → % change = +30%
🍽️18% tip on a $47 meal → 18% of 47 = $8.46
📊Scored 43 out of 50 → 43 is what % of 50 = 86%