Authoritative definitions for the measurement units used in estimates.
Construction
Board foot
Enter your values below for a clear, instant result.
Your result
board feet
FormulaBoard feet = thickness(in) × width(in) × length(ft) ÷ 12 × pieces
- Enter the known values.
- Apply the displayed formula.
- Review the result and supporting values.
Worked example: Nominal and actual lumber dimensions can differ.
Estimate notice: This board foot result is an estimate based only on the values and assumptions shown. Verify important decisions with the relevant official source or a qualified professional.
Understand the result before using it
Board foot uses thickness, width, length, and pieces to calculate its result. It converts project dimensions into an estimated material quantity using an idealized coverage or volume model.
Formula, assumptions, and example
Formula
Board feet = thickness(in) × width(in) × length(ft) ÷ 12 × pieces
Assumptions
- The entered thickness, width, length, and pieces are complete, valid, and use the units or format shown beside each field.
- Dimensions describe the intended finished geometry and use compatible units.
- Site conditions, openings, compaction, overlap, cuts, and waste are included only if represented by an input.
Worked example
Nominal and actual lumber dimensions can differ.
When to use it
Good uses
- Prepare an early material takeoff or purchasing estimate.
- Compare project dimensions or waste allowances.
- Check a manual quantity calculation before requesting supplier pricing.
Limitations
Common mistakes to avoid
- Actual yield varies with workmanship, substrate, product specification, settling, and site conditions.
- Do not use an estimate as a structural design, code check, or substitute for a supplier or qualified professional.
- Check the formula, source data, units, and displayed precision before relying on the result.
Sources and further reading
These references explain the underlying standards or provide authoritative context. Your own contract, institution, clinician, product documentation, local code, or governing standard may be the controlling source.
Primary sources for required safety factors, coverage rates, waste allowances, and code compliance.
Questions about this calculation
What does the Board foot calculate?
Board foot uses thickness, width, length, and pieces to calculate its result. It converts project dimensions into an estimated material quantity using an idealized coverage or volume model. The formula used is: Board feet = thickness(in) × width(in) × length(ft) ÷ 12 × pieces
Which inputs affect the Board foot result?
The result uses thickness, width, length, and pieces. Changing any of these values can change the output, so enter them using the labels and units shown.
Is the Board foot result exact?
This board foot result is an estimate based only on the values and assumptions shown. Verify important decisions with the relevant official source or a qualified professional.
When should I verify a Board foot result?
Verify it before any financial, health, academic, construction, safety, or engineering decision. Use the primary source or an appropriately qualified professional.
Clear answers, without the guesswork
1Enter your information
Use the fields above. Results refresh automatically as values change.
2Review the calculation
The formula and context explain how the result was reached.
3Save or share it
Copy your result, print a clean summary, or return from your recent tools.
Your calculation inputs
Calculator values are processed locally in your browser and are not sent to UnitMora's servers. Advertising partners may separately use cookies or similar technologies as explained in the Privacy Policy.
Local calculation. Saving an input stores it in this browser; it does not create a UnitMora account.