Janela Ideal (1/6 da área)
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
About this calculator
The Ideal Window Calculator for Natural Lighting helps determine the required window size to ensure adequate natural lighting in a room. The formula used is straightforward: the window area should be equal to 1/6 of the room area. For instance, if you have a 12-square-meter bedroom, the ideal window would be 2 square meters. This general rule aims to provide sufficient natural lighting without compromising privacy or security.
This calculator operates on the premise that natural lighting is essential for well-being and health. Natural light can positively influence mood, concentration, and even sleep regulation. Furthermore, a properly sized window can help reduce the need for artificial lighting, which can be beneficial for both the environment and energy savings.
When to use this calculator? Basically, whenever you are designing or renovating a space and want to ensure it receives sufficient natural light. This is especially important in areas with limited natural light or in rooms without large windows. However, it's crucial to remember that factors like property orientation, external obstacles, and window type also influence the amount of natural light entering the environment.
A common caution when using this calculator is to consider the specifics of the location and window type. For example, taller windows may be more effective at providing natural light than wider windows, depending on the room layout. Additionally, the presence of elements like eaves, trees, or adjacent constructions can affect the amount of light entering through the window.
Frequently asked questions
Why should the window area be 1/6 of the room area?
This is a general rule to ensure adequate natural lighting. Natural light is essential for well-being and can positively influence mood and health.
Does this calculator work for any type of window?
Basically, yes. However, factors like property orientation and external obstacles can influence the window's effectiveness in providing natural light.
What if the window is too small?
If the window is too small, it may not provide sufficient natural light for the room. In this case, consider increasing the window size or using artificial lighting.
Can I use this calculator for rooms with artificial lighting?
Yes, but remember that artificial lighting may not be as beneficial as natural light. Still, the calculator can help determine the window size needed to complement artificial lighting.
Does this rule apply to all rooms in the house?
The 1/6 rule is a general guideline, but it may vary depending on the room's use and specific lighting needs. For example, rooms with specific functions, like home offices, may require more natural light.