CalculationTime

Linear Feet Calculator

Calculate total linear feet from repeated lengths, optional extra runs, waste allowance and unit price for trim, boards, fencing, cable or edging.

Live math canvas

Your numbers, formula and explanation together

Linear Feet Calculator: 38.75 linear feet. Linear Feet Calculator uses the declared inputs to produce a transparent default result. Length of one piece/run: 8 ft; Number of pieces/runs: 12; Extra odd lengths: 6 ft; Waste/cut allowance: 10 %; primary comparison: 8 and 12.

Formula applied

The exact method behind this answer

CalculationTime keeps the method visible so the number can be checked instead of blindly trusted.

Measured linear feet = piece length × quantity + extra feet. Allowance feet = measured linear feet × waste percent ÷ 100. Planning linear feet = measured linear feet + allowance feet. Optional estimated cost = planning linear feet × price per linear foot.
  1. Apply the formulaMeasured linear feet = piece length × quantity + extra feet. Allowance feet = measured linear feet × waste percent ÷ 100. Planning linear feet = measured linear feet + allowance feet. Optional estimated cost = planning linear feet × price per linear foot.38.75 linear feetLinear Feet Calculator uses the declared inputs to produce a transparent default result. Length of one piece/run: 8 ft; Number of pieces/runs: 12; Extra odd lengths: 6 ft; Waste/cut allowance: 10 %; primary comparison: 8 and 12.

Your live breakdown

Current inputs in the calculation

These values come from the controls above and update when the calculator changes.

Length of one piece/run
8 ft
Enter the length of one repeated board, trim piece, fence panel run, cable pull or edge in feet.
Number of pieces/runs
12
Count how many equal pieces or runs use that length.
Extra odd lengths
6 ft
Add offcuts, returns, small wall sections, gate gaps, corners or unique runs measured separately.
Waste/cut allowance
10 %
Keep the pure measured total separate from ordering allowance.
Optional price per linear foot
2.75 currency/ft
Use 0 if you only need length. Enter supplier price for a quote note.

Resulting answer

38.75 linear feet

Linear Feet Calculator uses the declared inputs to produce a transparent default result. Length of one piece/run: 8 ft; Number of pieces/runs: 12; Extra odd lengths: 6 ft; Waste/cut allowance: 10 %; primary comparison: 8 and 12.

Answer
38.75 linear feet
Live support
Linear Feet Calculator uses the declared inputs to produce a transparent default result. Length of one piece/run: 8 ft; Number of pieces/runs: 12; Extra odd lengths: 6 ft; Waste/cut allowance: 10 %; primary comparison: 8 and 12.

Assumptions used

What this answer assumes

Use the printable report as a cut-list/quote-note companion, not as a structural or supplier ordering guarantee.

  • All repeated runs use the same entered piece length; odd runs are added in the extra-feet field.
  • Linear feet measure length only, not area or volume. Width, thickness, board profile and coverage belong in the product specification.
  • Waste/cut allowance is applied after the measured length is totaled so the pure measurement remains visible.
  • The cost estimate uses price per linear foot only and excludes tax, delivery, minimum order quantities, labour, fittings, fasteners and supplier rounding.

Master’s Tip

How to use the result well

Master’s Tip: write down where the extra-feet number came from. Linear-foot mistakes often hide in returns, gates, corners, mitred cuts, board defects and supplier stock lengths rather than in the main wall or fence run.

Printable record

What belongs in the saved calculation

Save the inputs, result, formula, assumptions, page URL and date together so the calculation can be reviewed later.

Length of one piece/run
8 ft
Enter the length of one repeated board, trim piece, fence panel run, cable pull or edge in feet.
Number of pieces/runs
12
Count how many equal pieces or runs use that length.
Extra odd lengths
6 ft
Add offcuts, returns, small wall sections, gate gaps, corners or unique runs measured separately.
Waste/cut allowance
10 %
Keep the pure measured total separate from ordering allowance.

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Embed this calculator

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Formula

Measured linear feet = piece length × quantity + extra feet. Allowance feet = measured linear feet × waste percent ÷ 100. Planning linear feet = measured linear feet + allowance feet. Optional estimated cost = planning linear feet × price per linear foot.

Worked example

For 12 runs at 8 ft each, repeated length is 8 × 12 = 96 ft. Add 6 ft of odd lengths to get 102 linear feet measured. A 10% allowance adds 10.2 ft, so the planning quantity is 112.2 linear feet. At 2.75 per linear foot, the material estimate is 112.2 × 2.75 = 308.55 before tax or delivery.

Professional note

Master’s Tip: write down where the extra-feet number came from. Linear-foot mistakes often hide in returns, gates, corners, mitred cuts, board defects and supplier stock lengths rather than in the main wall or fence run.

Regional and unit assumptions

Standard or basis: transparent length arithmetic using the international foot relationship for linear measurement. No building-code, supplier-pack-size or structural compliance is claimed; use drawings, product datasheets and local trade judgement before ordering.

Assumptions and limitations

Methodology & Accuracy

How this calculator is checked

CalculationTime pages are built around visible arithmetic: the formula, assumptions, worked example and practical limitations are shown so the result can be checked rather than simply trusted.

Formula used

Measured linear feet = piece length × quantity + extra feet. Allowance feet = measured linear feet × waste percent ÷ 100. Planning linear feet = measured linear feet + allowance feet. Optional estimated cost = planning linear feet × price per linear foot.

Standard or basis

Standard or basis: transparent length arithmetic using the international foot relationship for linear measurement. No building-code, supplier-pack-size or structural compliance is claimed; use drawings, product datasheets and local trade judgement before ordering.

Where a calculator follows a named legal, trade or industry standard, that standard is cited visibly. Otherwise the page uses transparent general arithmetic and states its limits.

Master's Tip

Master’s Tip: write down where the extra-feet number came from. Linear-foot mistakes often hide in returns, gates, corners, mitred cuts, board defects and supplier stock lengths rather than in the main wall or fence run.

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These cards are resolved from calculator data, category context and live-route status so the page links to useful next steps without hand-built link clutter.

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Questions

What is a linear foot?

A linear foot is one foot of straight length. It does not include width or thickness, so 10 linear feet of trim means 10 feet along the trim run.

How do I calculate linear feet?

Multiply the length of each repeated run by the number of runs, add any extra odd lengths, then add a separate waste or cut allowance if you are planning an order.

Is linear feet the same as square feet?

No. Linear feet measure length only. Square feet measure area, so they need both length and width.

What waste allowance should I use for linear feet?

It depends on the job. Simple straight runs may need only a small allowance, while trim, fencing, decking edges and mitred work often need more for cuts, defects and stock lengths.

Can I use this for fencing, baseboards or cable?

Yes, as a length and quote-note calculator. Check product width, pack size, fittings, posts, clips, joins, code requirements and installation details separately.

Calculation note

Linear-foot estimating is common because many materials are bought or quoted by length: trim, moulding, edging, cable, pipe, rope, fencing rails and boards. The arithmetic is simple, but the record matters because a single final length is only useful when the repeated runs, odd lengths and waste allowance travel with it.

Length is not coverage

A linear-foot total answers “how long is the run?” It does not answer how much wall, floor or surface area is covered. That is why this page points visitors to square-footage and board-foot calculators when width, thickness or volume matters.

Cut allowance belongs after the measured run

Keeping measured length and allowance separate makes the estimate easier to audit. A homeowner, supplier or tradie can see the actual run length first, then decide whether the cut allowance is enough for corners, mitres, defects and available stock lengths.

A printable quote note prevents silent assumptions

The print view keeps the run length, quantity, extra feet, waste percentage, formula and optional price together. That makes it suitable for a supplier counter, classroom worksheet, site note or homeowner comparison before a final order is placed.

Sources and further readingNIST: U.S. survey foot and international foot relationshipNIST Handbook 44: specifications, tolerances, and other technical requirements for weighing and measuring devices