Woodworking Calculator
Enter your furniture dimensions to instantly know how many sheets to buy and how much it'll cost
① What are you building? How big?
Pick a project type and enter dimensions (or apply a common size above)
See how it looks assembled (3D preview)
② Which wood? How much will it cost?
Pick a board type; the right side instantly updates sheets needed and total cost
Cut List & Sheet Layout Diagram Expand to see how each board is cut and arranged to save material (optional)
| Part Name | Length(cm) | Width(cm) | Qty | Grain | Area(m²) | Action |
|---|---|---|---|---|---|---|
| 0 | 0.00 | |||||
Sheet Layout Visualization
- Layout updates automatically when cut list changes
- System arranges parts on sheets with dimensions labeled
- Adjust display scale to view details
- Different colors represent different part types
- Click "Download Layout" to save as image for workshop reference
Unit Conversion (Taiwanese ft / cm / inch, cai volume) Expand if you need to convert traditional lumber units (optional)
Length Conversion
Cai Calculation
"Cai" is a traditional Taiwanese lumber unit
1 Cai = 1 Taiwan Ft × 1 Taiwan Ft × 1 Taiwan Inch ≈ 2,782 cubic cm
⚠️ Note: Some traditional lumber yards still use this unit, please confirm before purchase
Cost Results
About Woodworking Calculator
What is Woodworking Calculator?
Woodworking Calculator is a free online tool designed for DIY enthusiasts, providing practical functions such as lumber estimation, cost calculation, cut list generation, and unit conversion. Whether you want to build a bookshelf, desk, storage cabinet, or other woodworking projects, this tool can help you:
- Buy Right Materials - Accurately calculate required sheets, avoid buying too much or too little
- Control Budget - Estimate material costs, make project expenses clear
- Reduce Waste - Generate cut lists, maximize material utilization
- Learn Knowledge - Provide project examples, material guides, tool lists, and FAQs
Calculation Formula
Lumber Estimation:
- Standard Sheet Sizes:
- 3×6 ft = 92 × 182 cm
- 4×8 ft = 122 × 242 cm
- Project Area = (L×H×2 + W×H×2 + L×W×2) ÷ 10000 (m²)
- Actual Area Needed = Project Area × (1 + Waste Rate)
- Sheet Count = Actual Area ÷ Single Sheet Area (round up)
Cai Volume Calculation:
- 1 Cai = 1 Taiwan ft × 1 Taiwan ft × 1 Taiwan inch ≈ 2,782 cubic cm
- Cai = (Length cm × Width cm × Thickness cm) ÷ 2782
Lumber Price Reference (2024 Taiwan Market)
| Wood Type (18mm thick) | 3×6 ft | 4×8 ft |
|---|---|---|
| Plywood (Budget-friendly) | NT$340 | NT$600 |
| Pine Plywood (F3 Structural) | NT$500 | NT$900 |
| Solid Pine Board (Real Wood) | NT$1,400 | NT$2,400 |
| Blockboard-Falcata (Stable) | NT$450 | NT$800 |
| Blockboard-Lauan (Premium) | NT$620 | NT$1,100 |
<strong>📅 Price Update:</strong> October 2025 | Taiwan market reference values
<strong>⚠️ Note:</strong> Actual prices may vary by brand, grade, and origin. Please confirm with local lumber yard.
<strong>💡 Price Explanation:</strong> 3×6 ft is about 56% of 4×8 ft area, price is also about 56-57%
Material Characteristics and Applications
Choosing the right material is key to woodworking project success. Below are detailed characteristics, pros/cons, and best applications:
Plywood
<strong>Structure:</strong> Multi-layer thin wood sheets cross-laminated, usually odd number of layers (3, 5, 7, etc.)
<strong>✅ Pros:</strong>
- <strong>Affordable:</strong> Most economical choice for budget-limited projects
- <strong>Stable Structure:</strong> Cross-lamination prevents warping
- <strong>Lightweight:</strong> Relatively light, easy to transport and assemble
- <strong>Various Sizes:</strong> Widely available specifications
<strong>❌ Cons:</strong>
- <strong>Rough Edges:</strong> Needs edge banding after cutting
- <strong>Poor Water Resistance:</strong> Not suitable for humid environments
- <strong>Average Texture:</strong> Surface grain looks artificial, needs veneer
<strong>🎯 Best Applications:</strong>
- Practice projects (beginner trials)
- Back panels, bottom panels (hidden parts)
- Temporary furniture or display shelves
- Projects requiring paint or veneer
- Small storage boxes, organizers
Pine Plywood (F3 Structural Grade)
<strong>Structure:</strong> Made from pine wood layers, F3 structural grade certified (meets building material standards)
<strong>✅ Pros:</strong>
- <strong>High Strength:</strong> F3 certified, excellent load-bearing capacity
- <strong>Structurally Stable:</strong> Suitable for load-bearing furniture (bookshelves, tables)
- <strong>Natural Texture:</strong> Retains pine grain, natural appearance
- <strong>Easy Processing:</strong> Moderate material, suitable for nailing and screwing
- <strong>Eco-certified:</strong> Usually has formaldehyde content certification
<strong>❌ Cons:</strong>
- <strong>Higher Price:</strong> About 50% more than regular plywood
- <strong>Heavier Weight:</strong> More laborious to transport
- <strong>Needs Finishing:</strong> Recommend wood oil or varnish protection
<strong>🎯 Best Applications:</strong>
- <strong>Load-bearing Furniture:</strong> Bookshelves, shelves, workbenches
- <strong>Structural Frames:</strong> Cabinet frames, partition walls
- <strong>Children's Furniture:</strong> High safety requirement projects
- <strong>Outdoor Furniture:</strong> Balcony shelves (needs waterproof coating)
- <strong>Long-term Furniture:</strong> High durability requirement projects
Solid Pine Board
<strong>Structure:</strong> Multiple solid wood strips joined together, no veneer surface, natural wood grain
<strong>✅ Pros:</strong>
- <strong>Real Wood Texture:</strong> 100% solid wood feel, natural beautiful grain
- <strong>Renewable:</strong> Can be sanded and refinished after years of use
- <strong>Eco-friendly:</strong> No veneer glue, low formaldehyde
- <strong>Premium Look:</strong> Close to natural wood, suitable for display surfaces
- <strong>Easy Finishing:</strong> Can apply wood wax oil, wood oil, or varnish
<strong>❌ Cons:</strong>
- <strong>Expensive:</strong> 4× plywood cost, 2.5× pine plywood cost
- <strong>Prone to Warping:</strong> More affected by humidity, needs stable environment
- <strong>Needs Maintenance:</strong> Regular oiling to prevent cracking
- <strong>Has Knots:</strong> Natural pine has knots, needs selection
<strong>🎯 Best Applications:</strong>
- <strong>Tabletops:</strong> Desk tops, dining tables, worktops
- <strong>Shelves:</strong> Display shelves, bookshelf shelves
- <strong>Doors:</strong> Cabinet doors, drawer fronts
- <strong>Premium Furniture:</strong> Projects requiring solid wood texture
- <strong>Visible Surfaces:</strong> Any parts requiring wood grain display
<strong>💡 Usage Tip:</strong> Combine with pine plywood—use solid pine for tops, plywood for frames. Great texture with controlled cost
Blockboard-Falcata
<strong>Structure:</strong> Falcata solid wood strips core with plywood veneer on both sides, "sandwich" structure
<strong>✅ Pros:</strong>
- <strong>Excellent Stability:</strong> Resistant to warping, maintains shape over time
- <strong>Moderate Weight:</strong> Lighter than solid wood, heavier than plywood, easy to handle
- <strong>Strong Nail Holding:</strong> Edges hold nails and screws firmly
- <strong>High Durability:</strong> Suitable for long-term large furniture
- <strong>Reasonable Price:</strong> Good value, between plywood and solid pine
<strong>❌ Cons:</strong>
- <strong>Edges Need Banding:</strong> Cut edges expose wood strips, needs edge banding
- <strong>Surface Needs Veneer:</strong> Usually requires wood veneer or laminate
- <strong>Heavy:</strong> 18mm boards are noticeably heavy
<strong>🎯 Best Applications:</strong>
- <strong>Cabinet Systems:</strong> Wardrobes, bookcases, storage cabinets
- <strong>Doors:</strong> Cabinet doors, room doors (needs veneer)
- <strong>Large Desktops:</strong> Office desks, dining tables (laminate surface)
- <strong>Partition Walls:</strong> Light partitions, mezzanine floors
- <strong>Projects Requiring Nailing:</strong> Assembly furniture
Blockboard-Lauan
<strong>Structure:</strong> Lauan wood strips core with plywood veneer, premium blockboard
<strong>✅ Pros:</strong>
- <strong>Highest Stability:</strong> Lauan high density, very resistant to warping
- <strong>Super Nail Holding:</strong> Edges hold firmly, suitable for repeated assembly
- <strong>Best Durability:</strong> Long lifespan, suitable for heirloom furniture
- <strong>Good Moisture Resistance:</strong> More moisture-resistant than Falcata
- <strong>Premium Quality:</strong> Professional woodworkers' first choice
<strong>❌ Cons:</strong>
- <strong>Most Expensive:</strong> Nearly 2× plywood cost
- <strong>Heaviest:</strong> Requires two people to carry
- <strong>Harder Processing:</strong> Cutting and drilling requires stronger tools
<strong>🎯 Best Applications:</strong>
- <strong>Premium Cabinets:</strong> Built-in wardrobes, study systems
- <strong>Kitchen Cabinets:</strong> Needs moisture resistance
- <strong>Commercial Spaces:</strong> Store fixtures, office furniture
- <strong>Load-bearing Structure:</strong> High-strength framework needed
- <strong>Heirloom Furniture:</strong> Projects intended for 10+ years use
Quick Selection Guide
| Scenario | Recommended Material | Reason |
|---|---|---|
| 💰 Budget Limited (First Time) | Plywood | Cheap, no regret if failed |
| 📚 Bookshelf, Shelves (Load Books) | Pine Plywood (F3) | Strong load capacity, no sagging |
| 🪵 Desk, Dining Table Top | Solid Pine Board | Great texture, renewable, display surface |
| 🗄️ Large Wardrobe, Cabinet System | Blockboard (Falcata or Lauan) | Stable, durable, strong nail holding |
| 🍳 Kitchen Cabinet | Blockboard-Lauan | Moisture resistant, best durability |
| 👶 Children's Furniture | Pine Plywood (F3) | Structural safety, certified |
| 🎨 Practice, Trial | Plywood | Cheap, low trial cost |
| 🏆 Premium Furniture (Display) | Solid Pine + Blockboard Mix | Appearance with solid pine, structure with blockboard |
Mix Strategy: Smart Savings with Quality
Professional woodworker's cost-saving tips—use different materials in the same project:
- <strong>Desk Project:</strong>
- Desktop: Solid Pine Board (display surface, texture important) — NT$2,400
- Leg Frame: Pine Plywood (structural load-bearing) — NT$900
- Drawer Back Panel: Plywood (hidden, cost saving) — NT$600
- <strong>Total Cost: NT$3,900, save 40% vs all solid pine</strong>
- <strong>Bookshelf Project:</strong>
- Shelves, Side Panels: Pine Plywood (F3, load requirement) — NT$900 × 2 = NT$1,800
- Back Panel: Plywood (fixed only) — NT$600
- Door Surface: Solid Pine small pieces (only need 1/2 sheet) — NT$1,200
- <strong>Total Cost: NT$3,600, great texture and durable</strong>
- <strong>Cabinet System Project:</strong>
- Cabinet Frame: Blockboard-Falcata (stable, nail holding) — NT$800 × 3 = NT$2,400
- Door Surface: Solid Pine Board (display surface) — NT$2,400
- Drawer Bottom, Back Panel: Plywood (hidden) — NT$600
- <strong>Total Cost: NT$5,400, save 30% vs all Lauan blockboard</strong>
<strong>💡 Professional Tips:</strong>
- Use premium materials for visible surfaces (solid pine, Lauan blockboard)
- Use mid-grade materials for structural load-bearing (pine plywood, Falcata blockboard)
- Use economical materials for hidden parts (plywood)
- This combination provides quality with savings, best value approach
FAQ
Q1: What to do about warped boards?
<strong>A:</strong> Prevention: choose flat boards when purchasing and store vertically. For minor warping, press flat with weights for 2-3 days. Severe warping should be replaced as forced use affects structural safety.
Q2: First time woodworking, what project to start with?
<strong>A:</strong> Start with a "small shelf" (approx. 60×30×80 cm), simple structure, less material, low cost ($800-1,200 NT$). After success, try larger projects like bookshelves or desks.
Q3: Is DIY furniture really cheaper than buying ready-made?
<strong>A:</strong> Simple furniture (shelves) DIY saves 30-50%, complex furniture (tables, cabinets) saves 20-30%. But consider tool costs (first-time tool purchase ~$2,000-4,000 NT$). Core value is satisfaction, custom sizing, and skill learning.
Q4: What is "Cai" unit? Still in use?
<strong>A:</strong> "Cai" is traditional Taiwan lumber pricing unit, 1 Cai = 1 Taiwan ft × 1 Taiwan ft × 1 Taiwan inch ≈ 2,782 cubic cm. Some traditional lumber yards still use it, but large stores mostly price by "sheet". Confirm pricing method before purchase.
Safety Reminders
⚠️ This calculator provides reference data only. Pay attention to safety during actual work:
- Always wear safety goggles when using power tools
- Check for wires and pipes before drilling
- Keep work area clean to avoid tripping
- Consult professional woodworkers for load-bearing structures
