How do I calculate what percent one number is of another?

Divide the part by the whole and multiply by 100. Percentage = (part / whole) x 100. For example, 45 out of 60 is (45 / 60) x 100 = 75%.

How do I find X percent of a number?

Multiply the number by the percentage divided by 100. Value = number x (percent / 100). For example, 20% of 250 is 250 x 0.20 = 50.

Percentage Calculator — % of a Number, X out of Y, and % Change

Q: What percent is 200 out of 250?

200 out of 250 is 80 percent. You divide the part by the whole and multiply by 100: (200 / 250) x 100 = 80%.

Q: How do I calculate percentage increase or decrease?

Subtract the old value from the new value, divide by the old value, and multiply by 100. Percentage change = ((new - old) / old) x 100. From 250 to 300 is a 20% increase; from 300 to 250 is a 16.7% decrease.

Q: How do I convert marks to a percentage?

Divide the marks you scored by the total marks and multiply by 100. For example, 432 out of 500 is (432 / 500) x 100 = 86.4%.

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Percentage calculator explained — find what X percent of a number is, what percent one number is of another such as 200 out of 250 equals 80 percent, and the percentage increase or decrease between two numbers, using part divided by whole times 100

Three percentages people actually need — one calculator for each.

Quick answer: To find what percent one number is of another, divide the part by the whole and multiply by 100 — so 200 out of 250 = (200 ÷ 250) × 100 = 80%. To find X% of a number, multiply: 20% of 250 = 250 × 0.20 = 50. For percentage change, use ((new − old) ÷ old) × 100. The three calculators below do each one instantly.

Key takeaways

Part of a whole: (part ÷ whole) × 100 → 200/250 = 80%.
X% of a number: number × (percent ÷ 100) → 20% of 250 = 50.
Percentage change: ((new − old) ÷ old) × 100 → 250→300 = +20%.
Marks to %: (scored ÷ total) × 100 → 432/500 = 86.4%.

1. What percent is X out of Y?

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2. What is X% of a number?

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3. Percentage increase / decrease

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What percent is X out of Y? (the most-searched one)

This is the calculation people need most — turning a score or a part into a percentage. The formula is:

Percentage = (part ÷ whole) × 100

So 200 out of 250 = (200 ÷ 250) × 100 = 80%. A few more: 45 out of 60 = 75%; 18 out of 20 = 90%; 7 out of 8 = 87.5%. It's the same formula every time — divide, then multiply by 100.

How to find X% of a number

To take a percentage of something — a discount, a tip, a share — multiply:

Value = number × (percent ÷ 100)

20% of 250 = 250 × 0.20 = 50. Handy examples: 18% GST on ₹500 = ₹90; a 15% tip on ₹800 = ₹120; 5% of ₹2,000 = ₹100.

How to calculate percentage increase or decrease

To measure how much a value grew or shrank:

Percentage change = ((new − old) ÷ old) × 100

From 250 to 300 is a 20% increase; from 300 to 250 is a 16.7% decrease. Note the two aren't the same, because the "old" value (the base) is different each way.

Converting marks to a percentage

Students use the "X out of Y" formula constantly: divide marks scored by total marks, times 100. 432 out of 500 = 86.4%. If you're working with grade points instead of marks, use our CGPA to percentage calculator; for a specific board or university, see the CBSE best-of-five and Anna University CGPA tools, or check how many marks you need to pass with the marks-needed-to-pass calculator.

Everyday uses

Shopping: a 30% discount on ₹1,499 = you save ₹450 (pay ₹1,049).
Exams: convert any "scored / total" into a percentage.
Money: tips, GST, interest, and salary hikes are all percentages.
Comparisons: percentage change shows growth or drop at a glance.

Frequently asked questions

What percent is 200 out of 250?

80%. (200 ÷ 250) × 100 = 80.

How do I find what percent one number is of another?

(part ÷ whole) × 100. E.g. 45 out of 60 = 75%.

How do I find X% of a number?

number × (percent ÷ 100). E.g. 20% of 250 = 50.

How do I calculate percentage increase or decrease?

((new − old) ÷ old) × 100. 250→300 = +20%; 300→250 = −16.7%.

How do I convert marks to a percentage?

(marks scored ÷ total marks) × 100. E.g. 432/500 = 86.4%.

The bottom line

Percentages come down to three simple formulas: part over whole for "what percent," multiply for "percent of," and change over the old value for growth or drop. The calculators above handle each one — bookmark this for exams, shopping and everyday maths.

About ComplyKraft. Built by Dinesh Kumar S in Chennai — B.Sc. Mathematics, M.Sc. IT. ComplyKraft makes free calculators and plain-language guides for students and everyday tasks.

Disclaimer: A free educational calculator. Results are computed in your browser for general use.