Kalkulator Lantai
Calculate how much flooring material you need for any room. Includes waste factor for accurate estimates.
Cara menggunakan kalkulator ini
- Masukkan Room Length (ft)
- Masukkan Room Width (ft)
- Masukkan Waste Factor (%)
- Klik tombol Hitung
- Baca hasil yang ditampilkan di bawah kalkulator
How to Calculate Flooring
Calculating flooring is straightforward: measure room length × width to get square footage. Then add a waste factor (typically 5–15%) to account for cuts, mistakes, and pattern matching.
For simple rectangular rooms: Area = Length × Width. For L-shaped rooms: divide into rectangles and sum them. Add 10% waste for standard flooring, 15% for diagonal installation, and up to 20% for complex patterns.
Waste Factor Guide by Material
Hardwood (straight lay): 7–10%. Hardwood (diagonal): 12–15%. Tile (grid pattern): 10%. Tile (diagonal): 15%. Vinyl planks: 5–10%. Carpet: 10–15% (add for seams). Laminate: 10%.
Always buy slightly more than calculated — flooring batches vary in color, and matching replacement material later can be difficult.
Cost Estimation for Flooring
Average flooring costs per square foot (installed, US market): Carpet: $3–$8. Vinyl/LVP: $3–$7. Laminate: $3–$8. Hardwood: $8–$15. Tile: $5–$15. Natural stone: $15–$30.
Labor costs add $2–$5/sq ft for most materials. Total project cost = (material cost × sq ft with waste) + (labor cost × sq ft). Get at least 3 quotes from local contractors.
Terakhir diperbarui: March 2026
Frequently Asked Questions
How much flooring do I need for a 12x15 room?
A 12×15 room is 180 sq ft. With a 10% waste factor, order 198 sq ft. Most flooring boxes cover 20–25 sq ft, so you'd need about 8–10 boxes.
Should I add extra for waste?
Yes, always add 5–15% waste. Tiles and hardwood require cuts at walls and corners; diagonal or herringbone patterns waste even more. It's cheaper to return unused boxes than to order a second batch later.
How do I measure an irregular room?
Divide the room into simple rectangles, calculate each area, then sum them. Include closets. For curved walls, measure the longest dimensions and add extra waste.