Média geométrica 2 valores
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
About this calculator
The geometric mean calculator for two values computes the average between two numbers by multiplying them and taking the square root of the result. The formula used is √(a·b), where 'a' and 'b' are the input values. This type of mean is particularly useful when the numbers represent growth rates, compound interest, or multiplicative variations, such as in finance or sciences.
Unlike the arithmetic mean, which adds values and divides by their count, the geometric mean considers the multiplicative relationship between numbers. It's ideal for calculating averages of percentages, annual returns, or logarithmic scales. For instance, it can determine the average annual growth rate of an investment that grows 10% in one year and 20% in the next.
It's important to note that the geometric mean can only be calculated with positive numbers, as multiplying negative or null values might invalidate the result. It's also less suitable for datasets with extreme variations (outliers), as the mean is more sensitive to very high or low values. Always verify if the input data is compatible with the formula before using the calculator.
Frequently asked questions
What is the geometric mean used for?
It's used to calculate the average of values that multiply together, like growth rates, compound interest, or cumulative variations. It's ideal when cumulative growth matters more than linear growth.
Can I use this calculator with negative numbers?
No, the geometric mean only works with positive numbers. Multiplying negative values could result in a negative product, and the square root of a negative number isn't defined in real numbers.
What's the difference between geometric and arithmetic mean?
The arithmetic mean sums values and divides by count, while the geometric mean multiplies values and takes the root. The geometric mean is more accurate for multiplicative data like investments.
How to use this calculator in finance?
Input annual return rates for an investment to get the average annual return. For example: if an investment grows 10% and then 20%, the geometric mean shows the true average annual growth.