🎨 Painting Calculator PRO
Multi-room system, paint brands, surface prep, application methods & full cost breakdown.
Dimension Diagram — first wall, updates as you type
Paintable area is walls plus ceiling plus trim, minus doors and windows — currently — of wall.
1 Rooms
Walls
2 Paint Selection
3 Application Method
4 Cost & Labour
Labour Cost
Equipment Rental
Results
Per-Room Area
Areas & Coverage
Material Breakdown
⚠️ Pre-Export Checklist
- All room dimensions verified
- Door/window counts confirmed per room
- Surface condition assessed for each room
- Paint type and finish selected correctly
- Primer type matches surface condition
- Number of coats and dry times confirmed
- Labour hours and rate verified
Professional Painting Guide
Show formulas, coverage rates & tips ▼
Core Formulas
Wall Area= Sum of (Length x Height) for each wall
Deductions= (Doors x 21 sq ft) + (Windows x 15 sq ft) per standard sizes
Ceiling Area= Length x Width (only if painting ceiling)
Trim Area= Trim Length x (Trim Height / 12) in feet
Paintable Area= Wall Area + Ceiling Area + Trim Area - Deductions
Gallons Needed= (Paintable Area x Coats) / Coverage Rate
Primer Gallons= Paintable Area / Primer Coverage Rate
Brand Coverage Rates
| Brand | Latex | Oil | Epoxy |
|---|---|---|---|
| Asian Paints | 350-400 | 300-350 | 250-300 |
| Dulux | 350-420 | 320-380 | 260-320 |
| Sherwin-Williams | 350-400 | 300-370 | 250-310 |
| Benjamin Moore | 400-450 | 350-400 | 280-340 |
Finish Guide
- Matte: Hides imperfections, no shine. Best for ceilings and low-traffic rooms.
- Eggshell: Slight sheen, easy to clean. Ideal for living rooms and bedrooms.
- Satin: Soft lustre, durable. Great for kitchens, bathrooms, and hallways.
- Semi-Gloss: Reflective, moisture-resistant. Perfect for trim, doors, and cabinets.
- High-Gloss: Mirror-like, hardest finish. Best for accent walls and furniture.
Surface Prep Checklist
- New Drywall: Always prime (PVA primer). Skim coat joints if needed.
- Previously Painted: Clean with TSP, sand glossy surfaces, spot-prime repairs.
- Stained: Use stain-block primer (oil or shellac-based). May need 2 coats.
- Textured: Use thick-nap roller (3/4"-1"), budget 20-30% extra paint.
Application Tips
- Temperature matters: 50-85°F (10-30°C) is ideal for latex paint application.
- Humidity above 85% slows drying significantly and may cause bubbling.
- Always paint ceilings first, then walls, then trim for clean lines.
- Cut in edges with a brush before rolling for a professional finish.
- Maintain a wet edge to avoid lap marks — never stop mid-wall.
Common Mistakes
- Skipping primer on new drywall — causes uneven sheen and poor adhesion.
- Applying coats too thick — leads to drips, longer dry times, and cracking.
- Ignoring dry time between coats — minimum 2-4 hours, 24 hrs for oil-based.
- Using interior paint outside (or vice versa) — different UV and moisture resistance.
- Not buying enough paint — always add 10-15% waste factor for cutting, touch-ups.
Painting — 3D Preview
Drag to rotate — Scroll to zoom
相关计算器
Frequently used together on the same project.
Client & Quote (prints on PDF & Excel)
Adjustments (applies to exports)
Contingency is added as a separate line on the exported cost summary. Waste % is printed as an advisory reminder.
Project notes (prints on PDF & Excel)
Result compare (A/B)
| Item | Pinned | Current | Change |
|---|---|---|---|
Saved rates auto-apply from your Price Library. Advanced details stay in your browser — nothing is uploaded except inside your own PDF/Excel exports.
我们的免费在线 油漆 计算器可以精确计算您的建筑项目所需的材料数量。无论您是需要walls, ceilings, and trim的计算器，此工具都可以处理。输入您的项目尺寸即可获得即时结果。
📖 如何使用此 油漆 计算器
如何使用此 {c} 计算器
📐 理解油漆公式
基本公式是：体积 = 长度 × 宽度 × 深度。所有尺寸必须使用相同单位。在得到体积后，转换为所需的单位并加上损耗系数。
⚠️ 应避免的常见错误
估算时未将英寸转换为英尺
✓ 确保所有尺寸使用相同单位。
忽略损耗系数
✓ 始终添加5-10%。
材料计算不准确
✓ 请使用我们的计算器获得精确的数量。
💡 专业提示
始终订购超出计算量的材料。
检查当地建筑规范。
提前订购材料。
❓ 常见问题
输入您的项目尺寸，即可获得材料数量和成本估算。
是的，本计算器适用于各种规模的项目。
🏗️ 实际应用
我们的油漆计算器适用于各种建筑项目。无论是小型修补还是大型施工，此工具都提供准确的估算。
我们的免费油漆计算器是估算walls, ceilings, and trim最准确的在线工具。
✅Method, Sources & Review
Maintained by theBuildingCalc methods desk· Last reviewedSeptember 23, 2026. This calculator implements the standards and references below; every figure can be rechecked against the formulas and worked example on this page.
Results are estimates, not engineering advice. Verify against local codes and licensed professionals for structural, electrical, and gas work. See ourTerms. Spotted an error? Report it— corrections ship with the next review.