Window Size Calculator
Result
Recommended Window Count2 window(s)
Minimum Glazing Area2 m²
Floor Area20 m²
Area per Selected Window1.44 m²
↗ Construction
Window Size Calculator — free online calculator.
Formula
MinGlazing = FloorArea × 10%; WindowCount = ⌈MinGlazing / WindowArea⌉
- Window Size Calculator calculates its result from Floorarea, Windowarea. It uses the formula MinGlazing = FloorArea × 10%; WindowCount = ⌈MinGlazing / WindowArea⌉. Change any input to recalculate the result instantly.
- The main inputs are Room Width, Room Length, Window Type. Enter them in the units and format shown in the calculator.
- Keep measurements and project assumptions consistent before comparing or combining values.
- Changing any input above recalculates the result with the same calculation engine used by this page.
Example: Window Size
Inputs
- Room Width: 4
- Room Length: 5
- Window Type: double
Using Floorarea = 2, Windowarea = 3, the calculated result is 1.
Sample result: Calculating…
Frequently asked questions
What does the Window Size calculate?
Window Size Calculator — free online calculator.
Which values should I enter?
Enter Room Width, Room Length, Window Type using the units and format shown beside each field.
What formula does this calculator use?
The calculator uses the following relationship: MinGlazing = FloorArea × 10%; WindowCount = ⌈MinGlazing / WindowArea⌉.
Why might my result differ from another source?
Results can differ when another source uses different units, rounding rules, conventions or assumptions. Compare the inputs and definitions before comparing results.
Does the result update automatically?
Yes. Changing an input updates the result using the same calculation engine shown on this page.