# Carpenter Calculator: Board Feet, Waste and Cost Canonical URL: https://www.simplywise.com/blog/carpenter-calculator/ Plain text: https://www.simplywise.com/blog/carpenter-calculator/llms.txt Publisher: SimplyWise, Inc. (https://www.simplywise.com) Published: November 12, 2026 Updated: November 12, 2026 Category: How to Estimate Summary: Use this carpenter calculator to find board feet, add your waste factor, convert fractions, and price lumber and labor with your own inputs. --- Log in (https://simplywise.com/login) ## Carpenter Calculator: Board Feet, Waste and Cost Buy enough wood without losing track of cost. This carpenter calculator gives you board feet, waste, materials, and labor. Enter your sizes and supplier price, then check the cut list before you order. Add SimplyWise as a preferred source (https://www.google.com/preferences/source?q=simplywise.com) ### How much wood do you need? Use inches for thickness and width, feet for length. Fractions work in the inch fields. Thickness (inches) Width (inches) Length (feet) Pieces Waste (%) Your price per board foot ($) Total labor hours Your hourly rate ($) Rate starts at the BLS carpenter median wage, May 2025. Replace it with your own rate. 40.00 board feet with waste Before waste40.00 board feet Materials$0.00 Labor$116.48 Materials + labor subtotal$116.48 Enter a lumber price. Materials are not yet included in the subtotal. ### Convert a fraction Fraction or mixed number Try 3/4 or 1 1/2. Decimal: 0.75 Carpenter calculator, at a glance 1. Board feet measure wood volume, not floor area. 2. Enter thickness and width in inches, length in feet. 3. Count only boards with matching sizes in each run. 4. Set waste from your cut list, not a fixed rule. 5. Use a supplier quote for the material price. 6. Labor equals total hours times your hourly rate. ## How do you figure board feet? The carpenter calculator uses this formula: thickness times width times length, divided by 12, times pieces. Thickness and width are inches. Length is feet. One board foot equals a board 1 inch thick, 12 inches wide, and 1 foot long. For example, ten boards at 1 inch by 6 inches by 8 feet equal 40 board feet. Those sizes are only an example. For wall counts, use the framing stud calculator (https://www.simplywise.com/blog/framing-stud-calculator/). ## How do you add waste? Multiply net board feet by one plus waste percent divided by 100. For example, 40 board feet with a chosen 10% allowance becomes 44 board feet. That example does not set a waste rule for your job. First, lay out the cuts. Then allow for knots, end cuts, and grain matching. Board feet alone cannot tell you which stock lengths to buy. For sheet goods, use the plywood calculator (https://www.simplywise.com/blog/plywood-calculator/) instead. ## Use the carpenter calculator, step by step 1. Measure one board First, enter thickness and width in inches. Then enter length in feet. Use the sizes your supplier uses to bill. 2. Count matching pieces Next, group boards that share those dimensions. Run each group on its own. Then add the group totals. 3. Add your waste allowance Allow for cut ends, saw cuts, and defects. A careful cut list helps you choose the extra wood you need. 4. Price the wood and time Finally, enter the quoted board-foot price and total labor hours. Use your own hourly rate for the labor line. ## How do you convert fractions? Divide the top number by the bottom number. So 3/4 becomes 0.75. For a mixed number, add the whole part: 1 1/2 becomes 1.5. The inch fields accept either form. The converter keeps up to six decimal places. Board feet display to two places, but material math uses the full value. For stair layout, use the stair stringer calculator (https://www.simplywise.com/blog/stair-stringer-calculator/). ## What should the materials and labor lines include? Materials equal board feet with waste times your price per board foot. Labor equals total hours times your rate. Each cost line rounds to cents. The subtotal adds those rounded lines. BLS OEWS, May 2025 lists a national median carpenter wage of $29.12 an hour. In a worked example, 4 hours times $29.12 equals $116.48 in wages before payroll costs. This is an employee wage, not a customer billing rate. Use the labor cost calculator (https://www.simplywise.com/blog/labor-cost-calculator/) to work through payroll costs. Then add delivery, fasteners, tax, overhead, and profit to your quote. This carpenter calculator does not add them. ## Check the inputs before you quote Confirm whether the supplier bills on rough or finished sizes. Match the price basis to those dimensions. Also check species, grade, stock length, and delivery terms. For repairs, check whether sound wood can stay. Replace damaged parts as the scope requires. For roof cuts, use the roof pitch calculator (https://www.simplywise.com/blog/roof-pitch-calculator/) to check the slope. ### Match the order to the cut list List each finished part and its length before buying. Then check how those parts fit the boards on the rack. A volume total can look right while the boards are too short. Keep separate groups for each size. If the yard sells by piece or linear foot, ask for that price basis before using a board-foot rate. ## Turn your quantities into a SimplyWise quote SimplyWise Cost Estimator turns a photo into an itemized estimate in about 6 seconds. Review each material and labor line. Then send a professional, branded quote the client signs to approve. Try SimplyWise Cost Estimator free after you check the carpenter calculator results. Keep your measured quantities beside your quote. SimplyWise Cost Estimator costs $29.99 a month, $239.99 a year (about $20 a month on annual), with a 7-day free trial. ## Keep reading - Construction calculators (https://www.simplywise.com/blog/construction-calculators/): choose a takeoff tool. - How to estimate framing (https://www.simplywise.com/blog/how-to-estimate-framing/): plan the full scope. - Markup vs margin (https://www.simplywise.com/blog/markup-vs-margin-construction/): build your selling price. ## Sources ### Wages - BLS OEWS, May 2025, carpenters (https://www.bls.gov/oes/current/oes472031.htm). National figures reviewed November 12, 2026. ### Product facts - SimplyWise pricing (https://www.simplywise.com/blog/pricing/) and product FAQs. Read November 12, 2026. ## Frequently asked questions **What can a carpenter calculator do?** It finds lumber volume, adds your waste allowance, and prices materials and labor from your inputs. Check stock sizes and cut lengths before ordering. **How do I figure board feet?** Multiply thickness in inches by width in inches by length in feet. Divide by 12, then multiply by the number of pieces. Use matching units throughout. **How do I add waste?** Multiply net board feet by one plus your waste percent divided by 100. Choose the allowance from your cut list. Do not add the same allowance twice. **Can I measure lumber from a phone photo?** Measure board thickness and width with a tape or caliper. A photo alone does not give this calculator those sizes. Enter the dimensions yourself. Smart tools for contractors - Log in (https://simplywise.com/login) - New Business Program (https://www.simplywise.com/#program) - About (https://www.simplywise.com/about) - Support (https://www.simplywise.com/support) - Privacy (https://www.simplywise.com/privacy) - Terms (https://www.simplywise.com/terms) - Blog (https://www.simplywise.com/blog/) --- ## About SimplyWise SimplyWise, Inc. (New York, NY) builds mobile apps for contractors, tradespeople, and small business owners. The SimplyWise Cost Estimator turns a job site photo into an itemized estimate with labor and material costs in about 6 seconds, and the client signs the branded quote to approve it. It is rated 4.8 on the App Store. It is free to try with a 7-day free trial, then $29.99 per month or $239.99 per year (about $20 per month on the annual plan), and one subscription includes every app in the SimplyWise suite. - Download: https://www.simplywise.com/download - App Store: https://apps.apple.com/us/app/simplywise-cost-estimator/id6670619664 - Google Play: https://play.google.com/store/apps/details?id=com.simplywise.costestimator - Every SimplyWise page as plain text: https://www.simplywise.com/blog/llms.txt