Project notes
Understand this estimate
Repeated furniture parts can be estimated from their broad faces, with side edges added when selected. Different shapes and dimensions should be measured separately.
How to use the calculator
Describe the repeated component
Enter the number of matching parts and each part’s coated width and height.
Inputs Matching component count · Component width · Component height
Select faces and whether to include edges
Choose one or both broad faces. Thickness is used when the edge option is enabled.
Inputs Broad faces to finish · Include component edges · Component thickness
Apply the selected product system
Use product coverage and its coat instructions. Package size optionally converts the estimate to whole containers.
Inputs Product coverage · Coats · Extra allowance · Container size
Formula and variables
Broad area = count × width × height × selected faces ÷ 144. Optional edge area = count × 2 × (width + height) × thickness ÷ 144. Quantity = total area ÷ product coverage × coats × (1 + allowance ÷ 100).
- N × W × H × FBroad-face area
- Count, width, height and selected faces.in²
- N × 2(W + H) × TEdge area
- Included only when edges are selected.in²
- 144 in²Square-foot conversion
- Divides total square inches into square feet.in²/ft²
What the result means
Result interpretation
Surface area includes only the selected repeated faces and optional edges. Finish volume uses entered coverage, coats and allowance; it does not infer curves, undersides or openings.
Limits and assumptions
This assumes a repeated rectangular component and a single product rate for the selected surfaces. Curves, shelves, drawers and different component dimensions must be measured separately. Oils or complete-system coverage instructions may not use a per-coat rate.
Worked examples
Ten panels, broad faces only
Assumptions
- Each component is a 18 × 30 in rectangle.
- Both broad faces receive two coats; edges are excluded.
Calculation
- 10 × 18 × 30 × 2 ÷ 144 = 75 ft².
- 75 ÷ 400 × 2 = 0.375 US gal.
| Furniture surface area | 75 ft² |
|---|---|
| Finish estimate | 0.375 US gal |
| Whole containers | 1 containers |
The same panels with edges included
Assumptions
- Each component is 18 × 30 × 0.75 in.
- Both broad faces and all four edges receive two coats.
Calculation
- Broad faces = 75 ft²; edges = 10 × 2 × (18 + 30) × 0.75 ÷ 144 = 5 ft².
- 80 ÷ 400 × 2 = 0.4 US gal.
| Furniture surface area | 80 ft² |
|---|---|
| Finish estimate | 0.4 US gal |
| Whole containers | 1 containers |
Common questions
- Does the calculator count inside faces of drawers?
- Only if you include their dimensions as separate matching components or calculate them in another group.
- What if parts have different sizes?
- Group matching dimensions into separate estimates and add the quantities.