Add all your materials at once — floor planks, baseboard, crown molding, transition strips — and get a single combined shopping list. No other tool does this.
| Material Name | Area (sq ft) | Width (in) | Waste % | $/lin ft | |
|---|---|---|---|---|---|
For trim (baseboard, crown molding): enter 0 in Area and enter the perimeter length directly in the results — or measure the room perimeter and enter it as area with width=12 (1 sq ft = 1 lin ft at 12").
Square Feet vs Linear Feet — What Is the Difference?
- Square feet measure area. Linear feet measure length only.
- You cannot convert between them without knowing material width.
- Formula: Linear Feet = Sq Ft × 12 ÷ Width (inches)
- Works for flooring, trim, decking, fencing, siding, and lumber.
- Bonus: Multi-Material Batch Calculator — add all materials and get one combined shopping list.
Square feet measure area — a 2D surface with length and width. Linear feet measure length only — a straight line with no width or depth. They are different dimensions. You need material width to link them together.
Here is why. A linear foot of 12-inch wide flooring covers exactly 1 sq ft. A linear foot of 6-inch wide flooring covers 0.5 sq ft. The narrower the material, the more linear feet you need per square foot of coverage. This is the whole conversion in one idea.
The Formula — How to Convert Sq Ft to Linear Ft
Example 1 — Flooring: 300 sq ft room. 5-inch hardwood planks. Actual width = 4.75 in.
- Linear Feet = 300 × 12 ÷ 4.75 = 757.9 linear feet (exact)
- Add 7% waste: 757.9 × 1.07 = 810.9 linear feet
- Round up to the nearest full box or bundle length when ordering
Example 2 — Fencing: You have 350 linear feet of fence with 6-inch wide boards.
- Square Feet = 350 × 6 ÷ 12 = 175 sq ft of panel coverage
- This tells you how much area the fence boards cover vertically
Quick Reference — Linear Feet Per 100 Sq Ft by Width
How many linear feet do you need to cover 100 square feet? It depends entirely on the material width. Use this table as a fast estimate — then multiply by your actual area and add your waste factor:
| Material Width | Lin Ft (exact) | +7% Waste | +10% Waste | +15% Waste |
|---|---|---|---|---|
| 2.75" (3" hardwood actual) | 436 | 467 | 480 | 502 |
| 3.5" (baseboard / lumber) | 343 | 367 | 377 | 394 |
| 4.75" (5" hardwood actual) | 253 | 271 | 278 | 291 |
| 5.5" (5/4×6 decking actual) | 218 | 233 | 240 | 251 |
| 6" (LVP / fence board) | 200 | 214 | 220 | 230 |
| 7" (7" hardwood actual) | 171 | 183 | 189 | 197 |
| 7.25" (2×8 decking actual) | 166 | 178 | 183 | 191 |
| 9.25" (2×10 lumber actual) | 130 | 139 | 143 | 150 |
| 12" (1 ft wide material) | 100 | 107 | 110 | 115 |
Nominal vs Actual Width — The Mistake That Costs You Money
Most lumber and flooring products have two widths: nominal (the label on the shelf) and actual (what you measure with a tape measure). They are not the same.
A "5-inch" hardwood plank is actually 4.75 inches wide. A "3-inch" plank is actually 2.75 inches. The gap looks small. But on a 500 sq ft room, using nominal 5" instead of actual 4.75" means you calculate 1,200 linear feet when you need 1,265. You show up 65 linear feet short — that is about $200 in material you did not order.
- LVP (luxury vinyl plank): Almost always sold at true width. What the box says is what you measure.
- Hardwood and softwood: Nearly always nominal. A 2×4 is 1.5" × 3.5". A 1×6 is 0.75" × 5.5".
- Rule: Measure with a tape or ask your supplier for the actual width before you calculate. Always use actual, never nominal.
Common Material Widths Reference
Use actual widths in your calculations. These are verified typical actual dimensions for the most common materials:
| Material | Nominal Width | Actual Width | Recommended Waste |
|---|---|---|---|
| Hardwood flooring | 3" | 2.75" | 7–10% |
| Hardwood flooring | 5" | 4.75" | 7–10% |
| Hardwood flooring | 7" | 7.00" (true) | 7–10% |
| LVP / Vinyl Plank | 6" | 6.00" (true) | 5–7% |
| Decking (5/4×6) | 6" | 5.50" | 10–12% |
| Decking (2×6) | 6" | 5.50" | 10–12% |
| Fence board (cedar) | 6" | 5.50" | 5–8% |
| Baseboard trim | 3.5" | 3.50" (true) | 15% |
| Crown molding | varies | 2.5"–4.5" | 15–20% |
| Shiplap siding | 6" | 5.50" | 10% |
| Lumber (2×4) | 4" | 3.50" | 10% |
| Lumber (2×6) | 6" | 5.50" | 10% |
How to Handle Irregular Rooms and Odd Shapes
Most rooms are not perfect rectangles. Here is how to handle the most common shapes:
- L-shaped rooms: Split the L into two rectangles. Calculate the sq ft of each section separately. Add them together before converting to linear feet.
- Rooms with closets: Add the closet area to the main room total. Closets use the same flooring — include them.
- Diagonal installation: Add 15% extra waste on top of your standard waste. Diagonal cuts create more off-cuts than straight lay.
- Herringbone or chevron pattern: Add 20–25% waste. Every piece is cut at 45°. Off-cuts are significant.
- Bay windows and alcoves: Measure the full width × full depth of each bay, including the alcove area. Add to your total sq ft before converting.
Price Per Linear Foot — 2026 Reference Guide
Use this table to estimate total material cost for your project. Multiply your linear footage (with waste included) by the price range for your material.
| Material | Price per Linear Foot (2026) | Notes |
|---|---|---|
| Hardwood Flooring (Oak, Maple) | $3 – $12 / LF | Unfinished lower; prefinished higher |
| Laminate Flooring | $1 – $5 / LF | Budget-friendly; many wood looks |
| LVP / Vinyl Plank | $2 – $7 / LF | Waterproof; popular for kitchens and baths |
| Baseboard Molding (MDF) | $1 – $3 / LF | MDF cheapest; hardwood most expensive |
| Crown Molding | $2 – $6 / LF | Material cost; installation adds more |
| Wood Privacy Fence (cedar) | $10 – $22 / LF installed | Cedar lasts longer than pine |
| Vinyl / PVC Fence | $20 – $35 / LF material | Low maintenance; 25+ year lifespan |
| Decking (pressure-treated) | $1.50 – $4 / LF material | Labor runs $5–$12 / LF installed |
| Quartz / Granite Countertop | $60 – $200 / LF | Includes fabrication and install |
| Laminate Countertop | $15 – $40 / LF | Budget option; installed price |
Linear Feet vs Board Feet — What Is the Difference?
Linear feet measure length only. Board feet measure volume. You use board feet when thickness matters — like ordering hardwood lumber at a specialty sawmill or lumber yard.
When do you use linear feet? For flooring, trim, fencing, siding, and any material sold by length — where you need to cover a surface area.
When do you use board feet? For structural hardwood, custom furniture lumber, and any specialty wood priced by volume. Home Depot and Lowe's sell dimensional softwood lumber (2×4, 2×6) by the piece or linear foot. Hardwood specialty stores price by the board foot. Know which unit your supplier uses before you order.
When to Use Each Measurement
| Scenario | Use Square Feet For | Use Linear Feet For |
|---|---|---|
| Flooring | Measuring the room area | Ordering planks and boards |
| Baseboard trim | Not needed | Measuring perimeter directly |
| Decking | Deck surface area | Board count order |
| Fencing | Total panel coverage | Perimeter measurement |
| Siding | Wall area to cover | Board order quantity |
| Countertops | Not needed | Run length for fabrication quote |
| Structural lumber | Not needed | Beam and joist length orders |
Frequently Asked Questions
How do I convert square feet to linear feet?
Linear Feet = Sq Ft × 12 ÷ Width (in inches). You need the material width — the conversion is not possible without it. Example: 200 sq ft of 5-inch wide flooring → 200 × 12 ÷ 5 = 480 linear feet. Always use actual width, not nominal.
Why can't I convert sq ft to linear ft without knowing width?
Square feet measure area. Linear feet measure length. They are different dimensions. Width is the bridge between them. Without width, the conversion is mathematically undefined — like asking how many minutes are in a mile.
How many linear feet are in a square foot?
It depends on material width. For 12-inch wide material: 1 sq ft = 1 linear ft. For 6-inch material: 1 sq ft = 2 linear ft. For 3-inch material: 1 sq ft = 4 linear ft. The narrower the material, the more linear feet per square foot of coverage.
How much waste should I add for flooring?
7–10% for straight-lay rectangular rooms. 10–15% for diagonal patterns. 15–20% for herringbone. Always round up to the next full box or bundle. Never round down — you will run short.
How do I calculate linear feet for baseboard trim?
Measure the room perimeter in feet. Subtract door openings (about 3 ft each). Add 10–15% for cuts and inside corners. For trim, you measure the perimeter directly in linear feet — you do not need to know sq ft at all.
What is the actual width of 5-inch hardwood flooring?
Actual width is 4.75 inches. "5-inch" is the nominal size. Always use actual width for your calculation. A 200 sq ft room needs 505 linear feet at actual 4.75" versus 480 at nominal 5". The difference is 25 linear feet — that is real money at the register.
How do I calculate linear feet for decking?
Linear Feet = Deck Area × 12 ÷ Board Width. For a 400 sq ft deck with 5.5" actual boards: 400 × 12 ÷ 5.5 = 872.7 linear feet. Add 10–15% for end cuts and staggered joints. For diagonal decking, add 20%.
What is the difference between linear feet and board feet?
Linear feet measure length only. Board feet measure volume — they account for thickness too. Use linear feet for flooring, trim, and fencing. Use board feet when buying hardwood lumber at a sawmill or specialty store where thickness changes the price.
How do I calculate linear feet for a fence?
Measure the perimeter of the fenced area in linear feet. Subtract gate openings. That is your fence line in linear feet. For individual fence boards, use this calculator: enter the total fence area (height × linear footage) and the board width to get board count in linear feet.
If you need to go further, the Decking Calculator handles full board counts, joist spacing, and screw quantities for any deck. For walls and ceilings in the same project, the Drywall Calculator gives you exact sheet counts and a full shopping list. Need to convert project volumes too? The Square Feet to Cubic Yards Calculator converts area to volume in one step. And for ordering structural lumber by board foot, the Board Foot Calculator accounts for thickness, width, and length together.
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