Four Percentage Calculators
- What is a percent?
- A percent is a number that expresses a ratio in terms of 100.
Percentages and Ratios (and Fractions too)
What does this definition mean in practice?
How do you find percentage? These online percentage calculators are used for calculating:
- percent increase/decrease, and
- percentage of calculations.
A ratio is a relationship between two numbers. If a math class has 12 boys and 15 girls, the ratio of boys to girls is 12:15. (We could also say the ratio of girls to boys is 15:12.) We can also write the ratio of boys to girls as 12/15.
The expression 12/15 is a fraction.
The idea is the same: a ratio represents the same relationship as a fraction; it is simply written in a different form.
That explains what a ratio is. But what does “in terms of 100” mean?
This is the essential point. “In terms of 100” means the following: if the right-hand side of the expression “12:15” (the “15”) became “100,” what number should replace the “12” so the relationship remains equal to the original ratio of 12:15?
The answer is “80.” The ratio 12:15 is the same as 80:100, or 80%. In other words, the class has 80% as many boys as it has girls. Consider which of the percentage calculators below produces this result. If it is not obvious, continue reading.
One clarification first: we did not say the class is 80% boys. That statement would be incorrect. More below…
The Calculator-Calculate Percentage One Value is of Another Value
What percent is 20,000 of 100,000?
Twenty percent - 20%. You can solve this by dividing 20,000 by 100,000 and multiplying by 100 to convert the resulting decimal to a percent, i.e. (20000/100000)*100.