Example data table
These examples show typical openings and how deductions affect net glazed area.
| Type | Shape | Qty | Dimensions | Frame % | Glass % | Net (m²) |
|---|---|---|---|---|---|---|
| Window | Rectangle | 8 | 1.20 × 1.50 m | 12 | 100 | 12.672 |
| Glazed Door | Rectangle | 2 | 1.00 × 2.10 m | 18 | 70 | 2.411 |
| Skylight | Circle | 4 | Ø 0.90 m | 10 | 100 | 2.290 |
Example net values are rounded to three decimals and assume no overlaps.
Formula used
Each opening is calculated in two steps: gross opening area, then net glazed area.
- Rectangle: Area = Width × Height
- Circle: Area = π × (Diameter ÷ 2)²
- Triangle: Area = 0.5 × Base × Height
- Trapezoid: Area = 0.5 × (Base A + Base B) × Height
Net glazed area = (Gross area × Quantity) × (1 − Frame% ÷ 100) × (Glazing% ÷ 100).
How to use this calculator
- Select the unit you will enter for dimensions.
- Add openings and choose a shape per opening.
- Enter the required dimensions and quantity.
- Set frame deduction and glazing fraction percentages.
- Optionally enter wall and floor areas for ratios.
- Click Calculate to view totals and breakdown.
- Use CSV or PDF download buttons after results appear.