Home & DIY calculator
Room Measurements
Room Measurements. Use the actual product label and your measured quantities. Starting values are editable examples, not universal rates or product specifications. Keep the units beside each input.
Method and practical checks
- Wall area sums length × height × count. Measure door and window openings; do not subtract an opening twice.
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Your measurements and assumptions
Use the actual product label and your measured quantities. Starting values are editable examples, not universal rates or product specifications. Keep the units beside each input.
| Walls | [{"length":5,"height":2.5,"count":2},{"length":4,"height":2.5,"count":2}] | |
|---|---|---|
| Total measured openings | 4.7 | m² |
Method and assumptions
net_wall_m2 = sum(length * height * count) - sum(opening_areas)
Floor area is the sum of section areas; volume multiplies that area by the common height. Shared edges are not included in a perimeter estimate.
Wall area sums length × height × count. Measure door and window openings; do not subtract an opening twice.
Example with the selected inputs
- Gross wall area: 45 m²
- Net wall area: 40.3 m²
Change the inputs to match your own task. Whole packages are rounded up after allowances, so purchase quantity and actual requirement can differ. Apply each allowance once.