Decimals, Fractions and Percentages are just different ways of showing the same value:
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The percentage increase calculator calculates the chosen percentage from the initial quantity and adds it to the initial quantity to calculate the quantity after the increase. Similarly, the percentage decrease calculator subtracts the chosen percentage.
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Here, have a play with it yourself:
Example Values
Here is a table of commonly used values shown in Percent, Decimal and Fraction form:
Percent | Decimal | Fraction |
---|---|---|
1% | 0.01 | 1/100 |
5% | 0.05 | 1/20 |
10% | 0.1 | 1/10 |
12½% | 0.125 | 1/8 |
20% | 0.2 | 1/5 |
25% | 0.25 | 1/4 |
331/3% | 0.333.. | 1/3 |
50% | 0.5 | 1/2 |
75% | 0.75 | 3/4 |
80% | 0.8 | 4/5 |
90% | 0.9 | 9/10 |
99% | 0.99 | 99/100 |
100% | 1 | |
125% | 1.25 | 5/4 |
150% | 1.5 | 3/2 |
200% | 2 |
Conversions!
From Percent to Decimal
Fantastical 2 0 7 download free. To convert from percent to decimal divide by 100 and remove the % sign.
An easy way to divide by 100 is to move the decimal point 2 places to the left:
From Percent | To Decimal |
move the decimal point 2 places to the left |
Don't forget to remove the % sign!
From Decimal to Percent
To convert from decimal to percent multiply by 100%An easy way to multiply by 100 is to move the decimal point 2 places to the right:
From Decimal | To Percent |
move the decimal point 2 places to the right |
Don't forget to add the % sign!
From Fraction to Decimal
To convert a fraction to a decimal divide the top number by the bottom number:
Example: Convert 25 to a decimal
Divide 2 by 5: 2 ÷ 5 = 0.4
Answer: 25 = 0.4
From Decimal to Fraction
To convert a decimal to a fraction needs a little more work.
Example: To convert 0.75 to a fraction
Steps | Example |
---|---|
First, write down the decimal 'over' the number 1: | 0.751 |
Multiply top and bottom by 10 for every number after the decimal point (10 for 1 number,100 for 2 numbers, etc): | 0.75 × 1001 × 100 |
This makes a correctly formed fraction: | 75100 |
Then Simplify the fraction: | 34 |
From Fraction to Percentage
To convert a fraction to a percentage divide the top number by the bottom number, then multiply the result by 100%
Example: Convert 38 to a percentage
First divide 3 by 8: 3 ÷ 8 = 0.375
Then multiply by 100%: 0.375 × 100% = 37.5%
Answer: 38 = 37.5%
From Percentage to Fraction
To convert a percentage to a fraction, first convert to a decimal (divide by 100), then use the steps for converting decimal to fractions (like above).
Example: To convert 80% to a fraction
Steps | Example |
---|---|
Convert 80% to a decimal (=80/100): | 0.8 |
Write down the decimal 'over' the number 1: | 0.81 |
Multiply top and bottom by 10 for every number after the decimal point (10 for 1 number,100 for 2 numbers, etc): | 0.8 × 101 × 10 |
This makes a correctly formed fraction: | 810 |
Then Simplify the fraction: | 45 |
Calculator Use
Find a percentage or work out the percentage given numbers and percent values. Use percent formulas to figure out percentages and unknowns in equations. Add or subtract a percentage from a number or solve the equations.
How to Calculate Percentages
There are many formulas for percentage problems. You can think of the most basic as X/Y = P x 100. The formulas below are all mathematical variations of this formula.
Let's explore the three basic percentage problems. X and Y are numbers and P is the percentage:
- Find P percent of X
- Find what percent of X is Y
- Find X if P percent of it is Y
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1. How to calculate percentage of a number. Use the percentage formula: P% * X = Y
Example: What is 10% of 150?
- Convert the problem to an equation using the percentage formula: P% * X = Y
- P is 10%, X is 150, so the equation is 10% * 150 = Y
- Convert 10% to a decimal by removing the percent sign and dividing by 100: 10/100 = 0.10
- Substitute 0.10 for 10% in the equation: 10% * 150 = Y becomes 0.10 * 150 = Y
- Do the math: 0.10 * 150 = 15
- Y = 15
- So 10% of 150 is 15
- Double check your answer with the original question: What is 10% of 150? Multiply 0.10 * 150 = 15
2. How to find what percent of X is Y. Use the percentage formula: Y/X = P%
Example: What percent of 60 is 12?
- Convert the problem to an equation using the percentage formula: Y/X = P%
- X is 60, Y is 12, so the equation is 12/60 = P%
- Do the math: 12/60 = 0.20
- Important! The result will always be in decimal form, not percentage form. You need to multiply the result by 100 to get the percentage.
- Converting 0.20 to a percent: 0.20 * 100 = 20%
- So 20% of 60 is 12.
- Double check your answer with the original question: What percent of 60 is 12? 12/60 = 0.20, and multiplying by 100 to get percentage, 0.20 * 100 = 20%
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3. How to find X if P percent of it is Y. Use the percentage formula Y/P% = X
Example: 25 is 20% of what number?
- Convert the problem to an equation using the percentage formula: Y/P% = X
- Y is 25, P% is 20, so the equation is 25/20% = X
- Convert the percentage to a decimal by dividing by 100.
- Converting 20% to a decimal: 20/100 = 0.20
- Substitute 0.20 for 20% in the equation: 25/0.20 = X
- Do the math: 25/0.20 = X
- X = 125
- So 25 is 20% of 125
- Double check your answer with the original question: 25 is 20% of what number? 25/0.20 = 125
Remember: How to convert a percentage to a decimal
- Remove the percentage sign and divide by 100
- 15.6% = 15.6/100 = 0.156
Remember: How to convert a decimal to a percentage
- Multiply by 100 and add a percentage sign
- 0.876 = 0.876 * 100 = 87.6%
Percentage Problems
There are nine variations on the three basic problems involving percentages. See if you can match your problem to one of the samples below. The problem formats match the input fields in the calculator above. Formulas and examples are included.
What is P percent of X?
- Written as an equation: Y = P% * X
- The 'what' is Y that we want to solve for
- Remember to first convert percentage to decimal, dividing by 100
- Solution: Solve for Y using the percentage formula
Y = P% * X
Example: What is 10% of 25?
- Written using the percentage formula: Y = 10% * 25
- First convert percentage to a decimal 10/100 = 0.1
- Y = 0.1 * 25 = 2.5
- So 10% of 25 is 2.5
Y is what percent of X?
- Written as an equation: Y = P% ? X
- The 'what' is P% that we want to solve for
- Divide both sides by X to get P% on one side of the equation
- Y ÷ X = (P% ? X) ÷ X becomes Y ÷ X = P%, which is the same as P% = Y ÷ X
- Solution: Solve for P% using the percentage formula
P% = Y ÷ X
Example: 12 is what percent of 40?
- Written using the formula: P% = 12 ÷ 40
- P% = 12 ÷ 40 = 0.3
- Convert the decimal to percent
- P% = 0.3 × 100 = 30%
- So 12 is 30% of 40
Y is P percent of what?
- Written as an equation: Y = P% * X
- The 'what' is X that we want to solve for
- Divide both sides by P% to get X on one side of the equation
- Y ÷ P% = (P% × X) ÷ P% becomes Y ÷ P% = X, which is the same as X = Y ÷ P%
- Solution: Solve for X using the percentage formula
X = Y ÷ P%
Example: 9 is 60% of what?
- Writen using the formula: X = 9 ÷ 60%
- Convert percent to decimal
- 60% ÷ 100 = 0.6
- X = 9 ÷ 0.6
- X = 15
- So 9 is 60% of 15
What percent of X is Y?
- Written as an equation: P% * X = Y
- The 'what' is P% that we want to solve for
- Divide both sides by X to get P% on one side of the equation
- (P% * X) ÷ X = Y ÷ X becomes P% = Y ÷ X
- Solution: Solve for P% using the percentage formula
P% = Y ÷ X
Example: What percent of 27 is 6?
- Written using the formula: P% = 6 ÷ 27
- 6 ÷ 27 = 0.2222
- Convert decimal to percent
- P% = 0.2222 × 100
- P% = 22.22%
- So 22.22% of 27 is 6
P percent of what is Y?
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- Written as an equation: P% × X = Y
- The 'what' is X that we want to solve for
- Divide both sides by P% to get X on one side of the equation
- (P% × X) ÷ P% = Y ÷ P% becomes X = Y ÷ P%
- Solution: Solve for X using the percentage formula
X = Y ÷ P%
Example: 20% of what is 7?
- Written using the formula: X = 7 ÷ 20%
- Convert the percent to a decimal
- 20% ÷ 100 = 0.2
- X = 7 ÷ 0.2
- X = 35
- So 20% of 35 is 7.
P percent of X is what?
- Written as an equation: P% * X = Y
- The 'what' is Y that we want to solve for
- Solution: Solve for Y using the percentage formula
Y = P% * X
Example: 5% of 29 is what?
- Written using the formula: 5% * 29 = Y
- Convert the percent to a decimal
- 5% ÷ 100 = 0.05
- Y = 0.05 * 29
- Y = 1.45
- So 5% of 29 is 1.45
Y of what is P percent?
- Written as an equation: Y / X = P%
- The 'what' is X that we want to solve for
- Multiply both sides by X to get X out of the denominator
- (Y / X) * X = P% * X becomes Y = P% * X
- Divide both sides by P% so that X is on one side of the equation
- Y ÷ P% = (P% * X) ÷ P% becomes Y ÷ P% = X
- Solution: Solve for X using the percentage formula
X = Y ÷ P%
Example: 4 of what is 12%?
- Written using the formula: X = 4 ÷ 12%
- Solve for X: X = Y ÷ P%
- Convert the percent to a decimal
- 12% ÷ 100 = 0.12
- X = 4 ÷ 0.12
- X = 33.3333
- 4 of 33.3333 is 12%
What of X is P percent?
- Written as an equation: Y / X = P%
- The 'what' is Y that we want to solve for
- Multiply both sides by X to get Y on one side of the equation
- (Y ÷ X) * X = P% * X becomes Y = P% * X
- Solution: Solve for Y using the percentage formula
Y = P% * X
Example: What of 25 is 11%?
- Written using the formula: Y = 11% * 25
- Convert the percent to a decimal
- 11% ÷ 100 = 0.11
- Y = 0.11 * 25
- Y = 2.75
- So 2.75 of 25 is 11%
Y of X is what percent?
- Written as an equation: Y / X = P%
- The 'what' is P% that we want to solve for
- Solution: Solve for P% using the percentage formula
P% = Y / X
Example: 9 of 13 is what percent?
- Written using the formula: P% = Y / X
- 9 ÷ 13 = P%
- 9 ÷ 13 = 0.6923
- Convert decimal to percent by multiplying by 100
- 0.6923 * 100 = 69.23%
- 9 ÷ 13 = 69.23%
- So 9 of 13 is 69.23%
Related Calculators
Find the change in percentage as an increase or decrease using the Percentage Change Calculator.
Solve decimal to percentage conversions with our Decimal to Percent Calculator.
Convert from percentage to decimals with the Percent to Decimal Calculator.
If you need to convert between fractions and percents see our Fraction to Percent Calculator, or our Percent to Fraction Calculator.
References
Weisstein, Eric W. 'Percent.' From MathWorld -- A Wolfram Web Resource.