FizzyTools
Marks percentage calculator
Work out your percentage from total marks or subject by subject, with each subject’s percentage. Free, and your numbers never leave your device.
How it works
- 1Pick your questionPercent of a number, change, difference, marks and more.
- 2Type the numbersThe answer appears as you type, exact, with the working.
- 3Copy or shareCopy the answer or the working, or a link that opens the same sum.
Formulas
- P% of X
- X × P ÷ 100
- X is what % of Y
- X ÷ Y × 100
- X is P% of what
- X × 100 ÷ P
- Change from A to B
- (B − A) ÷ |A| × 100 (positive: increase, negative: decrease)
- X increased by P%
- X × (1 + P ÷ 100); decreased: X × (1 − P ÷ 100)
- Original value
- value now ÷ (100 + P) × 100 after adding P%; ÷ (100 − P) × 100 after taking off P%
- Difference of A and B
- |A − B| ÷ ((|A| + |B|) ÷ 2) × 100
- Marks
- total marks ÷ total maximum × 100
- Fraction to percent
- a ÷ b × 100
Sources: the definitions of percent, relative change and percentage point; marks as total obtained ÷ total maximum × 100.
Questions
How do I calculate percentage of marks for 5 subjects?
Add the five marks, add the five maximum marks, divide and multiply by 100. 85 + 90 + 72 + 88 + 76 = 411 out of 500 = 82.2%. Boards and universities may use their own rules, so check your mark sheet.
Can subjects have different maximum marks?
Yes. Type each subject’s own maximum, such as 80 for theory and 20 for a practical; the total uses each one.
Can it convert CGPA to percentage?
No. Each board and university has its own CGPA formula, so use the one printed on your mark sheet or prospectus.
How do I work out a percentage of a number?
Multiply the number by the percentage and divide by 100. 20% of 150 is 150 × 20 ÷ 100 = 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 a percentage increase or decrease?
Subtract the old value from the new one, divide by the old value and multiply by 100. From 80 to 100 is (100 − 80) ÷ 80 × 100 = a 25% increase.
What's the difference between percentage change and percentage difference?
Change has a before and an after, and is measured against the before. Difference compares two values with no order, measured against their average. 10 to 20 is a 100% increase, but 10 and 20 differ by 66.67%.
How do I find the original price before a percentage was added?
The price now is 118% of the original (100% + 18%). So divide by 118 and multiply by 100: 1,180 ÷ 118 × 100 = 1,000. Taking 18% off 1,180 gives 967.60, which is wrong, because the 18% was worked out on 1,000. This is also called a reverse percentage.
What is a percentage point?
The plain difference between two percentages. A rate going from 4% to 5% rises by 1 percentage point, which is a 25% increase.
Why does +20% and then −20% not get me back to the start?
The second change is taken from the new, bigger number. 100 + 20% = 120, then 120 − 20% = 96, an overall 4% decrease.
Are the answers exact? How are they rounded?
Every sum is worked out exactly, as a fraction. Only the display is rounded, to the decimal places you choose (2 by default), with halves rounded away from zero. A rounded answer is marked, and shows its exact value, such as 33.3̅% = 1/3.
Are my numbers sent anywhere?
No. Everything is worked out in your browser. A shared link carries the numbers after a #, a part of the link that browsers don't send to servers.