Percentages Calculator
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Percentages Calculator
Percentages are one of the most widely used mathematical concepts in countless everyday life activities and professional industries. Calculating discounts, understanding tax rates, determining loan interest, doing statistics, computing restaurant tips, etcetera, all benefit when the concept of percentages is understood.
The word percentage is derived from the Latin words pro centum, which literally translate to "per hundred". Hence, one percentage of a value reflects one hundredth of that value. For example, 25% means 25 out of every 100, while 50% means half of a total value. Percentages thus help people compare values quickly and clearly.
Percentage calculations are essential in many fields, including:
- Finance and accounting - calculating profit margins, interest rates, taxes, inflation, and investment growth.
- Business and e-commerce - discounts, markups, conversion rates, and sales performance.
- Education - grades, test scores, and performance analysis.
- Statistics and science - probability, data analysis, and percentage change.
- Healthcare and medicine - dosage calculations and statistical reporting.
- Daily life - budgeting, tipping, savings, and comparing prices.
This free online percentage calculator helps you quickly solve common percentage problems without needing to do manual calculations. Whether you need to find a percentage of a number, calculate what percentage one number is of another, or determine percentage increase or decrease, the formulas and examples below make it easy.
Formulas and Examples
What is x% of y?
Formula: (x/100)*y
Example: 20% of 90 = (20/100)*90 = 18.
What percentage is z of y?
Formula: (z/y)*100
Example: 18 of 90 = (18/90)*100 = 20%.
What is the increase/decrease going from z to y?
Formula: (y - z) / z * 100
Example: Going from 18 to 90 is a (90-18)/18*100 = 400% increase.
Common Percentage Calculator Uses
People frequently use percentage calculators for:
- Finance and accounting - calculating profit margins, interest rates, taxes, inflation, and investment growth.
- Business and e-commerce - discounts, markups, conversion rates, and sales performance.
- Education - grades, test scores, and performance analysis.
- Statistics and science - probability, data analysis, and percentage change.
- Healthcare and medicine - dosage calculations and statistical reporting.
- Daily life - budgeting, tipping, savings, and comparing prices.