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Percentage calculator

  

Pick a mode, enter two numbers. The answer and the steps appear right away.

What do you want to find?

%

Percent increase or decrease? Use the percentage change calculator.

20% of 150

30

20 ÷ 100 × 150 = 30

Next: Percentage calculatorPercent increase or decrease between two numbers.

Percentages without the mistakes

A percentage is a share out of 100. Three questions cover almost everything. What is p% of a number? Multiply by p ÷ 100. What percent is one number of another? Divide the part by the whole and multiply by 100. What was the whole, if p% of it is a known amount? Divide the amount by p ÷ 100. The tool has a mode for each, plus marks, CGPA and attendance.

Watch the difference between percent and percentage points. A rate going from 10% to 12% rose by 2 percentage points, which is a 20% increase. Percentages of different bases do not add up either. A 10% rise followed by a 10% fall leaves you 1% lower, because the fall is taken from the bigger number. For changes like that, use the percentage change calculator.

For CBSE, a CGPA is roughly turned into a percentage by multiplying by 9.5. Many universities use their own factor, so check your marksheet. For attendance, the tool shows how many classes you can miss, or must attend, to stay at a target such as 75%. Money percentages are covered by the discount calculator, GST and VAT and the tip calculator. For pay rises, the salary calculator shows what a new CTC means in hand.

Sources

What this calculator does not account for

  • Rounding beyond the decimals shown.
  • Whether a percentage of a percentage is what you need (percentage points vs percent).

How this is calculated

Formula: Part, whole and percent

part =percent ÷ 100 × whole · percent =part ÷ whole × 100

What the symbols mean

  • wholeThe number you take the percentage of: total marks, the full price, all classes held.
  • partThe piece you have: marks scored, the discount, classes attended.

Good to know

  • CGPA to percentage: CBSE says multiply the CGPA by 9.5. Many universities use their own factor, often 10 or (CGPA − 0.5) × 10, so check your marksheet.
  • For a percent increase or decrease between two numbers, use the [percentage change calculator](/calculators/percentage-change).

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Worked examples

Each example is worked out by the same code as the calculator above.

Marks to percentage

432 out of 500 is 432 ÷ 500 × 100 = 86.4%.

Attendance to reach 75%

You attended 60 of 90 classes, which is 66.7%. To reach 75% you need x more classes in a row where (60 + x) ÷ (90 + x) = 0.75, so x = 30.

Embed this calculator

The frame shows the tool only.

<iframe src="/embed/percentage" title="Percentage" width="100%" height="720" style="border:0;max-width:42rem" loading="lazy"></iframe>

Questions

How do I calculate a percentage of a number?

Divide the percent by 100 and multiply by the number. 20% of 150 is 0.20 × 150 = 30.

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

Divide the part by the whole and multiply by 100. 45 out of 60 is 45 ÷ 60 × 100 = 75%.

How do I calculate my marks percentage?

Add the marks you scored in all subjects, divide by the total maximum marks, and multiply by 100. 430 out of 500 is 86%.

How do I convert CGPA to percentage?

For CBSE, multiply the CGPA by 9.5. A CGPA of 8.6 is about 81.7%. Universities may use a different formula, so check the back of your marksheet.

How many classes can I bunk and stay above 75%?

Classes you can miss = attended ÷ 0.75 − total held, rounded down. With 90 of 100 attended you can miss 20 more and stay at 75%.

How do I work out a percentage increase?

Take the difference, divide by the starting number and multiply by 100. The [percentage change calculator](/calculators/percentage-change) does this for you.

How do I convert CGPA to a percentage?

For CBSE, multiply by 9.5: a CGPA of 8.6 is about 81.7%. Other boards and universities publish their own formula.

What is the difference between percent and percentage points?

Going from 10% to 12% is a rise of 2 percentage points but a 20% increase in the rate itself.

How many classes can I miss and stay at 75%?

With A attended out of T held, you can miss floor(A ÷ 0.75 − T) more classes. With 80 of 100, that is 6.