Percentage Calculator


21 out of 40 as a percentage is 52.5%
Percentage Calculation
What is 21 out of 40 as a percentage?
Percentage = Relative ValueReference Value x 100
21/40 as a percent = 21/40 x 100
= 21/2 x 5
= 105/2
= 52.5
21/40 as a percentage is 52.5%.

Percentage calculator to express the given quantity (number, rate, amount, mass, volume etc.) as a fraction of 100. Enter the relative and reference quantity and click on the FIND button shows what is the percentage.


What is Percentage?
Percentage is the way of expressing a quantity (number, rate, amount, mass, volume etc.) as a fraction of 100. In other words, it is the way of expressing a quantity in each 100. It is often used to represent proportions in terms of each 100 and represented by the symbol %.


The percentage calculator will be more useful to quickly find and express the given quantity as a fraction of 100 in the similar scenarios given below:


  1. What is 65 out of 90 as a percentage?
  2. There are 18 girls in the classroom of 45 students. What is the percentage of girls in the classroom?
  3. 360 people preferred electric cars in the survey involving 500 people. What percentage of people have preferred electric cars?
  4. $150 is the processing fee on a bank loan $70000. What is the processing fee in percentage?
  5. George bought a mobile phone for $900 and paid $45 extra as VAT. What is the percentage of VAT?

Since the percentage is commonly used in real estate, insurance, trading, transportation, construction, telecommunication, agriculture etc. almost in every business and everyday life, the percentage calculator is often required to find the relative quantity in each 100 with respect to the reference or whole quantity.