Calculadora de Variação Percentual
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
variação = (valor_final − valor_inicial) / valor_inicial × 100
About this calculator
The Percentage Change Calculator determines the relative change between two values: an initial and a final one. The result is expressed as a percentage, indicating an increase or decrease. The formula used is: change = (final value − initial value) / initial value × 100. The value can be positive (growth) or negative (decline).
You can use this tool in various situations: calculate the percentage increase of a rent, the percentage drop in sales, the variation in stock prices, or the difference between revenues from different months. Simply enter the two numbers and instantly get the percentage change.
Cautions: ensure the initial value is not zero, as division by zero is undefined. The tool handles decimals and negative numbers. For very small changes, the result may be rounded to zero. Always check that the values are in the correct order: initial before final.
Frequently asked questions
Can I use negative values in the calculator?
Yes, the calculator accepts negative values for both initial and final values. The result will correctly indicate the percentage change.
What happens if the initial value is zero?
If the initial value is zero, the percentage change cannot be calculated (division by zero). The calculator will display an error message or undefined result.
Does the calculator show decimal places?
Yes, the result is displayed with two decimal places by default, but you can round as needed.
What is the difference between percentage change and percentage difference?
Percentage change measures the relative change from the initial value. Percentage difference typically compares two values without a time reference, using the average as the base.
Can I use this calculator to calculate price increases?
Yes, it is ideal for calculating percentage increases or discounts on prices, as long as you have the original and new values.