Estimate linear feet for trim, fencing, edging, lumber, borders, and other materials sold by length.
Enter each straight run separately. Add as many segments as needed.
Enter the room or rectangular area dimensions to calculate the perimeter.
Enter the total area and the material width to find how many linear feet you need.
Enter the linear feet and material width to find the area covered.
Enter the total linear feet you already know you need. The calculator will apply waste and round to purchasable quantities.
Optional Lumber Board-Foot Helper
Board feet measure lumber volume (thickness × width × length). This is separate from linear feet. Do not treat them as the same unit.
Results
Plan for
— ft
total linear feet after waste
Measured
—
linear ft
Pieces to Buy
—
pieces
Est. Cost
—
material
Est. Leftover
—
linear ft
Material Breakdown
| Category | Linear Feet |
|---|
Full Breakdown
What this means
Assumptions Used
Want to compare different stock lengths, waste factors, or pricing options?
Each input helps you build a complete material estimate. Here is what each field does:
Enter your measurements and click Calculate to see your estimate.
Adjust the settings below for each scenario to compare different stock lengths, waste factors, material widths, or pricing options. Scenario A uses your current calculator inputs.
Comparison Chart
| Scenario | Waste % | Stock Length | LF After Waste | Pieces to Buy | Purchasable LF | Leftover LF | Est. Cost |
|---|
Comparison Notes
A linear foot measures length in one direction. If a board, fence line, trim piece, or edging strip is 12 feet long, it is 12 linear feet long. The word "linear" simply means measured along a straight line, as opposed to area (two dimensions) or volume (three dimensions).
According to NIST unit conversion guidance, one foot equals exactly 0.3048 meters, which is the internationally defined relationship between U.S. customary and metric length units.
Linear feet measure length. Square feet measure area. You cannot accurately convert square feet to linear feet unless you also know the width of the material.
The relationship comes from the basic area formula for rectangles: area = length × width. Therefore, length = area ÷ width. This is confirmed by OpenStax Contemporary Mathematics.
A 4-inch-wide board and an 8-inch-wide board cover different amounts of area per linear foot. The 8-inch board covers twice the area per linear foot, which means you need fewer linear feet to cover the same square footage with a wider material.
This is critical when buying decking boards, edging strips, flooring planks, or any material sold by length where width determines coverage. Always use the actual dressed or finished width, not the nominal name on the label.
Use linear feet for:
This calculator provides a planning estimate. Actual material needs can change because of:
Total measured linear feet = Segment 1 + Segment 2 + Segment 3 + …
Each segment is a straight run of material. All segments are converted to a common unit (feet) before summing. The total is then multiplied by any repeated-section count.
Perimeter = 2 × (Length + Width)
Net linear feet = Perimeter − Openings − Deductions
Based on the standard rectangle perimeter relationship confirmed by OpenStax Contemporary Mathematics.
Linear feet = Square feet ÷ Material width in feet
This rearranges the rectangle area formula. Material width must be converted to feet before dividing. According to NIST SP 811 Appendix B, 1 inch = 0.0833… feet exactly.
Square feet = Linear feet × Material width in feet
This applies the standard rectangle area formula. Useful when you know the length of material you are buying and want to estimate coverage area.
Linear feet after waste = Net linear feet × (1 + Waste % ÷ 100)
Waste accounts for cuts, corners, seams, defects, and layout changes. The waste factor is an editable planning assumption, not a universal rule. Default is 10%.
Pieces = ⌈ Linear feet after waste ÷ Stock length ⌉
Purchasable linear feet = Pieces × Stock length
Leftover = Purchasable linear feet − Linear feet after waste
⌈ ⌉ means ceiling (round up to the next whole piece). Materials are purchased in whole boards, rolls, or packages.
Cost = Purchasable LF × Price per LF
or: Cost = Pieces × Price per piece
Tax = Cost × Tax rate
Total = Cost + Tax + Delivery
Cost estimates include only material cost unless the user enters tax, delivery, or other optional fees.
Board feet = (Thickness in × Width in × Length ft) ÷ 12
Board feet measure lumber volume, not length. Do not treat board feet and linear feet as the same unit. See AWC Weights & Measurement guidance and the USDA Forest Products Lab Wood Handbook for lumber sizing context.
A user wants to estimate baseboard for a 12 ft by 14 ft room.
This calculator estimates linear feet by converting all measurements to a common unit (feet), applying the selected formula, adding the user's chosen waste factor, and rounding up to purchasable piece or package quantities when stock length is provided. It provides an estimate based on the inputs you provide. It does not account for every possible cut, defect, product requirement, local code rule, delivery fee, labor charge, permit, or field condition.
These resources provide additional context on measurement, material planning, and project preparation.
Before buying materials, confirm your measurements with a tape measure, measuring wheel, product label, or supplier quote. For trim and molding, measure each wall run separately and note doorways, closets, and corners. For fencing, edging, and deck borders, confirm the layout, terrain, gates, posts, curves, and local requirements. For lumber, check actual dimensions and product length before purchasing.
A linear foot is a length measurement equal to one foot, or 12 inches, measured in a straight line. Materials such as trim, lumber, fencing, edging, wire, and fabric are often sold by linear foot. It measures length only, not area or volume.
No. A linear foot measures length, while a square foot measures area. To convert square feet to linear feet, you must know the width of the material. Without material width, the conversion is not possible.
Convert the material width to feet, then divide the square footage by that width. For example, 120 square feet with a 6-inch-wide material: width = 6 ÷ 12 = 0.5 ft, then 120 ÷ 0.5 = 240 linear feet before waste. The calculator does this conversion automatically when you enter the area and material width.
Material width is required when converting between area and length. A wider board, edging strip, or plank covers more square feet per linear foot than a narrower one. Without width, square feet and linear feet cannot be accurately converted into one another.
Waste depends on the material, layout, cuts, corners, defects, and installation method. The calculator provides editable default waste factors by project type (typically 5–12%). These are planning assumptions, not universal rules. Check product instructions or ask your supplier if you need a tighter estimate. Angled cuts for crown molding, curved edging borders, and dense corner layouts typically require more waste than straight runs.
Materials are often sold in whole boards, sticks, rolls, or packages. If you need 48.4 linear feet and the material is sold in 8-foot pieces, you cannot buy exactly 48.4 feet. The calculator rounds up to the next whole piece — 7 pieces, or 56 linear feet — and shows the estimated leftover so you can plan for off-cuts or returns.
Subtract openings if the material will not cover those sections. For baseboards, users often subtract doorway openings. For fencing, gates may require separate hardware, posts, and framing, so treat the deduction as a length estimate only, not a complete fence plan. Enter deductions in the "Openings or Deductions" field.
The main calculator estimates linear feet (length). Board feet measure lumber volume using thickness, width, and length — they are a separate concept. When the Lumber project type is selected, the Advanced Options panel includes an optional board-foot helper. The result is displayed separately and clearly labeled so it is not confused with the linear feet estimate.
No. The calculator estimates material length and optional material cost based on the inputs provided. It does not include labor, permits, inspections, code compliance, structural requirements, property-line issues, or professional installation details. Consult a qualified professional for structural, code-regulated, or permit-required work.
The math is accurate based on the numbers entered, but the estimate is only as accurate as your measurements and assumptions. Product dimensions, cuts, mistakes, layout changes, slopes, defects, and installation requirements can change the final amount needed. Always verify measurements and product requirements before purchasing. This calculator is a planning tool, not a professional measurement.
Found a calculation error, an outdated assumption, a broken source link, or something unclear on this page? Contact the Homebase Calculators Editorial Team so we can review it. We update pages when corrections are warranted.