Calculate percentages instantly with the free Percentage Calculator from Blanza Tools. Find X percent of any number, see what percentage one number is of another, or work out percentage increase and decrease — perfect for discounts, tips, grades and business math.
Find X% of a number, see what percentage one number is of another, or calculate percentage increase and decrease — instant answers, no sign-up.
20% of 150 = 30
How to use
Choose a calculation type: X% of Y, Y is what % of X, or % increase/decrease.
Enter your numbers in the fields.
See the answer update live with a plain-English explanation.
Frequently Asked Questions
How do I calculate X percent of Y?
Multiply Y by X and divide by 100. For example, 20% of 150 is (20 × 150) ÷ 100 = 30. The calculator does this instantly.
How do I find what percentage one number is of another?
Divide the part by the whole and multiply by 100. For example, 30 out of 120 is (30 ÷ 120) × 100 = 25%.
How is percentage increase calculated?
Subtract the old value from the new value, divide by the old value and multiply by 100. Going from 80 to 100 is a 25% increase.
What is the difference between percent and percentage points?
Percent is relative to the starting value, while percentage points are the simple arithmetic difference between two percentages — for example, from 20% to 25% is a 5-percentage-point increase but a 25% relative increase.
Is the percentage calculator free?
Yes — completely free and unlimited, with no sign-up required.