Calculadora de Porcentagem
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
resultado = (porcentagem / 100) × valor
About this calculator
The Percentage Calculator is a practical tool to quickly calculate X% of a value. Simply enter the desired percentage and the base value, and the result is displayed formatted in Brazilian standard, with a comma separating cents. The formula used is simple: (percentage / 100) × value. For example, to calculate 15% of 200, the result is 30. This calculator is useful for everyday situations, such as calculating discounts on purchases, surcharges on bills, tips at restaurants, or commissions.
How it works: the user inputs the percentage (e.g., 20) and the value (e.g., 150). The system divides the percentage by 100 and multiplies by the value. The result is shown with two decimal places, in Brazilian format (e.g., R$ 30.00). The tool is ideal for those who need speed in percentage calculations, avoiding manual errors or the use of conventional calculators.
When to use: in purchases with discounts, to know how much you will pay less; in calculating tips (10% or 15% of the total bill); in personal finance, to calculate simple interest or returns; in sales, to determine commissions. It is a versatile calculator for students, professionals, and consumers.
Cautions: ensure the percentage is in the correct format (number without % symbol). Remember that the calculator does not consider additional taxes or fees. For percentages greater than 100%, the result will be larger than the base value, which may indicate surcharges.
Frequently asked questions
How do I calculate 20% of 250 using this calculator?
Enter 20 in the percentage field and 250 in the value field. The result will be 50, since 20% of 250 is 50.
Does the result appear in reais?
Yes, the result is formatted in Brazilian standard, with two decimal places and a comma, like R$ 30.00. But you can interpret it as any unit.
Can I calculate percentages greater than 100%?
Yes. For example, 150% of 200 results in 300. This is useful for surcharges or percentage increases.
Does the calculator consider compound interest?
No. It only calculates simple percentage (X% of a value). For compound interest, use a specific calculator.
Do I need to type the % symbol?
No. Just type the number. The system understands it as a percentage.