Calculadora de Solução Percentual
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
%(v/v) = (V_sol / V_total) × 100
About this calculator
The Percentage Solution Calculator is an online tool that determines the concentration of a solution in percentage terms. It calculates both volume by volume (% v/v) and mass by volume (% m/v) percentages, depending on the data provided by the user. The formula for % v/v is: %(v/v) = (volume of solute / total volume of solution) × 100. For % m/v, the formula is: %(m/v) = (mass of solute / total volume of solution) × 100. The user enters the appropriate values, and the calculator returns the percentage result.
This tool is useful in various practical situations, such as preparing solutions in chemical laboratories, in the pharmaceutical industry for drug dilution, or even at home when mixing cleaning products. For example, when preparing a 70% (v/v) alcohol solution, you can use the calculator to verify if the proportions are correct. This helps ensure the effectiveness and safety of the final product.
Some precautions are important when using this calculator. Make sure the units of measurement are consistent: for % v/v, both the solute volume and the total volume should be in the same unit (e.g., mL). For % m/v, the solute mass should be in grams and the total volume in milliliters. Remember that percentage concentration is dimensionless but expressed in % (percent). Additionally, the sum of the volumes of solute and solvent is not always equal to the total volume due to molecular interactions; therefore, the total volume should be measured after mixing, not simply added.
Frequently asked questions
What do % v/v and % m/v mean?
% v/v stands for volume by volume, meaning the percentage of the solute's volume relative to the total solution volume. % m/v stands for mass by volume, meaning the mass of solute in grams per 100 mL of solution.
Can I use the calculator to prepare cleaning solutions at home?
Yes, as long as you know the amounts of solute and solvent. For example, to make a diluted bleach solution, enter the volume of the product and the total volume of the mixture.
What is the difference between percentage concentration and molarity?
Percentage concentration expresses the amount of solute in 100 parts of solution (by volume or mass), while molarity is the number of moles of solute per liter of solution. They are different ways to express concentration.
Why is the total volume not simply the sum of solute and solvent volumes?
Due to intermolecular interactions, such as volume contraction when mixing water and alcohol, the final volume may be less than the sum. Therefore, it is recommended to measure the total volume after mixing.
Does the calculator work for solutions with more than one solute?
No, it is designed for solutions with a single solute. For mixtures with multiple solutes, you need to calculate each concentration separately.