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BuildSkill
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Carpentry learning lab

Measure it. Understand it. Build it.

Learn the math carpenters use, then put it to work in small projects.

Welcome back, Builder

Open a tool, study an example, then apply the skill.

🛠 Carpentry skills
Today’s confidence quote

Your skill grows each time you measure, check, and try again.

Choose a lesson or plan

💡
Today’s carpentry thought

Layout marks are only useful when you know what each mark measures from. Keep your starting point clear.

Meet your task agents

Your helper team

Prototype helpers route students to visual tools and checklists. They do not yet connect to a live AI model; instructor review remains part of every hands-on task.

Learning app for carpentry. Use tools only with instructor or qualified adult supervision and follow the safety rules for your workspace.

Carpentry Math Aid

Use the ruler and worked examples to check common carpentry measurements.

TAPE MEASURE · ONE INCH

Read the marks between 0 and 1 inch

Each small step is 1/16 inch. Longer marks show common fractions.

One-inch ruler marked in sixteenths with common fractionsAn open-face ruler from zero to one inch with sixteen evenly spaced marks. Sixteenth fractions appear above the scale and simplified fractions appear in green below it.1/16″2/16″3/16″4/16″5/16″6/16″7/16″8/16″9/16″10/16″11/16″12/16″13/16″14/16″15/16″16/16″1/16″1/8″3/16″1/4″5/16″3/8″7/16″1/2″9/16″5/8″11/16″3/4″13/16″7/8″15/16″01″
Example: 6/16″ simplifies to 3/8″. Count six small marks from zero.
FEET ↔ INCHES

Multiply or divide by 12

1 ft = 12 in · 2 ft 7 in = (2 × 12) + 7 = 31 in

ADD MEASUREMENTS

Add like units first

2′ 6″ + 1′ 9″= 3′ 15″= 4′ 3″

Regroup 12 inches as 1 foot.

AREA

Length × width

A 10′ × 12′ floor = 120 sq ft. With 10% extra: 120 × 1.10 = 132 sq ft.

WALL LAYOUT · 16″ O.C.

Measure center to center

20 ft × 12 = 240 in. 240 ÷ 16 = 15 spaces; add one end stud = 16 studs for a basic straight wall before corners and openings.

ROOF PITCH

Rise for each 12″ of run

4″ rise ÷ 12″ run = 4:12 pitch. This describes slope; it does not size framing.

Small projects, real skills

Each build develops planning, measuring, layout, and careful assembly skills.

📐 Architectural Drawing Generator

Open the birdhouse or 8 × 10 shed project, then switch views to study coordinated floor, wall, roof, opening, and material schedules. The drawings use dimensions, framing symbols, and a blueprint grid.

Project plans are learning guides, not engineered plans. Check the material, fasteners, and tool use with your instructor before building.

Carpentry Toolbox

Quick calculators, measurement references, and visual helpers for the classroom.

Checking offline readiness…

Privacy policy and app data · App support

Real carpentry tools arranged on a woodworking bench
YOUR FIRST STOP

Tools for measuring, layout, and planning

Use the examples to plan classroom tasks. Confirm real work with your instructor and the project plans.

Today’s confidence quote

📐 Square-footage calculator

Enter length and width in feet. Add a waste allowance for a rough material estimate.

Enter dimensions to calculate.

🏠 Roof-pitch calculator

Pitch is rise over a 12-inch horizontal run. Use this to understand slope, not to size structural members.

4 in rise over 12 in run = 4:12 pitch.

🫧 Phone tilt level

Enable your phone’s motion sensor and use the illustrated bubble as a guide. Sensor readings are an estimate; confirm the surface with a physical level.

Tap “Enable motion sensor” and allow access when your phone asks.
If no permission prompt appears, allow Motion & Orientation Access in your browser or device settings, then try again. Sensor readings vary by phone and case. Check with a physical level before relying on a surface or structure.

💧 Room moisture photo review

Use a room photo to record visible clues and plan a careful follow-up inspection.

What do you observe in the photo?

Your photo stays in this browser session in this prototype. Select visible clues to create a follow-up note.
Photo limits: A photo cannot measure moisture or confirm mold, hidden leaks, or the cause of damage. Confirm with a suitable moisture meter and a qualified person. Do not touch or disturb suspected mold; report it to your instructor or building maintenance. For active leaking, follow the site’s emergency procedure.

🪚 Stud-layout visualizer

Show a possible regular stud layout behind a wall surface. Set wall width, spacing, and the first stud center.

Estimated layout: regular spacing only.
Estimate only: A photo cannot confirm hidden studs. Framing may differ around corners, openings, repairs, and utilities. Verify with a stud finder or by a safe, instructor-approved method before drilling, cutting, or fastening.

📋 Cut list and lumber tally

Build a cut list for a classroom project. Enter finished piece dimensions in inches; the tally estimates board feet and total linear feet.

No parts yet. Add dimensions to start a list.

Board-foot tally = thickness × width × length ÷ 144 × quantity. It is a planning estimate; account separately for kerf, defects, stock sizes, and waste.

🔢 Fraction and decimal helper

Convert a common sixteenth-inch fraction to a decimal or add and subtract two measurements.

2″ + 1½″ = 3½″ (3.5 in)

Results round to the nearest 1/16″. Always verify layout marks with the tape measure and plan.

🧰 Tool Knowledge and Use

Learn what common tools do, the basic setup, and the safety check before supervised practice.

Carpentry tape measure shown by itself on a light background
Tool shown: Tape measure

📏Tape measure

Use: Measure stock, openings, and layout distances.

Use it: Hook the end, pull the blade straight, read the largest whole inch first, then the fraction. Write the unit beside the number.

Check: Keep fingers clear of a fast-retracting blade; retract it under control.

Carpentry framing square shown by itself on a light background
Tool shown: Framing square

📐Framing square

Use: Mark square cuts and transfer layout lines.

Use it: Seat the heel firmly on the board edge, hold it steady, and mark along the blade or tongue as needed.

Check: Confirm the edge is clean and the square is not bent before trusting a mark.

Carpentry level shown by itself on a light background
Tool shown: Level

🫧Level

Use: Check a surface level (horizontal) or plumb (vertical).

Use it: Clean the base, place the level firmly on the surface, and let the bubble settle between the vial marks. Turn it end-for-end to check consistency; use the vertical vial to check plumb.

Check: Protect the vial. For the phone tool, select horizontal or vertical mode and move slowly; confirm real work with a physical level.

Carpentry hammer shown by itself on a light background
Tool shown: Hammer

🔨Hammer

Use: Drive approved nails and adjust small assemblies.

Use it: Secure the work, start the fastener with controlled taps, then strike squarely.

Check: Inspect the handle and head. Wear eye protection and keep hands out of the strike path.

Carpentry circular saw shown by itself on a light background
Tool shown: Circular saw

🪚Circular saw

Use: Make approved straight cuts in supported stock.

Use it: Only after training and authorization. Set depth as directed, support both sides as required, and let the saw reach speed before cutting.

Check: Inspect guard, blade, cord or battery, and work area. Keep both hands positioned as trained and wait for the blade to stop.

Carpentry drill / driver shown by itself on a light background
Tool shown: Drill / driver

🪛Drill / driver

Use: Drill pilot holes and install specified screws.

Use it: Match the bit to the fastener, secure the work, and start at low speed with the driver square.

Check: Remove the battery before changing accessories. Keep loose clothing, hair, and jewelry clear of rotation.

🦺 Carpentry Safety Gear

Select PPE for the task hazards and your instructor’s site plan. PPE works alongside guarding, dust controls, safe work practices, and training.

🥽Eye and face protection

Wear safety glasses with side protection where flying particles can reach the eyes. Add a face shield when the task assessment calls for it; a face shield does not replace safety glasses.

🎧Hearing protection

Use correctly fitted earplugs or earmuffs when required by the noise assessment or site rules, especially around saws and other loud equipment.

😷Respiratory protection

Control dust at its source with suitable collection or wet methods. Use a respirator only when the exposure plan requires it, with proper selection, fit, and training.

⛑️Head and fall protection

Wear a hard hat or protective helmet where overhead, impact, or electrical hazards exist. Use the required fall protection for elevated work and follow the site plan.

🥾Foot protection

Choose sturdy, slip-resistant work boots; use safety-toe protection where falling or rolling objects create a toe hazard.

🧤Hand protection

Choose gloves for material handling, concrete, or chemicals when appropriate. Remove gloves near rotating woodworking machinery if they could catch; follow the machine and task rules.

Before work: Inspect PPE, confirm it fits, and ask the instructor what the task requires. No single PPE list fits every carpentry task.

PPE Diagram · match protection to the hazard

A quick visual reminder of common carpentry PPE. Your instructor and task hazard review determine what is required.

HeadHard hat where impact or overhead hazards exist
EyesSafety glasses with side protection; face shield when required
HearingFitted earplugs or earmuffs for the identified noise exposure
RespiratoryUse dust controls; respirator selection and fit follow the exposure plan
HandsTask-suitable gloves; keep gloves away from rotating machinery if entanglement is possible
FeetSturdy slip-resistant work boots; safety toe when hazard review calls for it
PPE does not replace guarding, dust collection, safe work methods, training, or supervision. Never wear gloves near rotating woodworking machinery when they create an entanglement hazard.

Fall Protection Harness · labeled components

This is the green full-body harness style you selected. Use the photo and component guide to identify the parts before reviewing the site-specific fall-protection plan.

Green full-body fall-arrest harness laid flat, with shoulder, chest, waist, and leg straps and metal buckles
Full-body harness · front view. The dorsal D-ring is on the back side.
  1. 1
    Shoulder strapsSupport the upper body when the harness is fitted correctly.
  2. 2
    Chest strap and buckleConnects the shoulder straps across the chest.
  3. 3
    Torso adjustment straps and bucklesAdjust and secure the harness to the wearer.
  4. 4
    Leg straps and bucklesSecure around the thighs; check fit and routing.
  5. 5
    Sub-pelvic support strapHelps distribute forces when the harness is properly worn.
  6. 6
    Dorsal D-ring · backCommon attachment point for a compatible personal fall-arrest system. It is on the back side and is not shown in this front view.
  7. 7
    Compatible connector or lanyardA separate connecting device selected for the system and task; it is not a harness strap.
Before elevated work: A qualified person must select and inspect compatible equipment, confirm fit, anchorage and fall clearance, and establish rescue arrangements under the site plan. Remove damaged equipment from service. This visual is for part identification only; it does not teach fit, tie-off, or rescue procedures.

Safety Coach

Review these points with your instructor before starting a project.

Check each item as you review it with your instructor.
This checklist is a learning aid. It does not replace the instructor’s job hazard review, tool training, supervision, or site procedures.

Carpentry Field Guides

Explore a real-world example, identify the parts, and follow the work sequence. Check the plans with your instructor before building.

Illustrated Foundation to Finish poster showing site layout, foundation, floor system, wall and roof framing, enclosure, and final inspection
Foundation to Finish
Use the poster’s build sequence as a map. Open each guide below to study the parts, process, and checks.
Blueprint & layoutFoundationFloor & framingRoof & shinglesSidingWindow cappingFinish & inspection
01
BLUEPRINT · PLAN TO FIELD

Read the plan before the build

Connect drawing symbols, dimensions, and site layout before work begins.

Construction blueprint and layout tools on a workbench with a staked building footprint in the background
Start with the drawing set, the dimension strings, and a clear site reference.
  1. Find the title, scale, north or reference direction, and revision date.
  2. Read overall dimensions first, then locate openings, offsets, and notes.
  3. Compare the plan with the site and report conflicts before marking or digging.
  4. Transfer dimensions from the approved drawing using one consistent reference point.

Use current approved plans and instructions. A classroom sketch is not a construction document.

02
FOUNDATION · CORNERS

Understand a foundation corner

Conceptual plan view: two foundation walls meet at a right angle.

Realistic example of formwork and reinforcement meeting at a foundation corner
Observe the braced forms and reinforcement turning the corner.
  1. Set out the corner from the approved foundation plan and verify dimensions diagonally for square.
  2. Build and brace forms; confirm line, level, plumb, and required clearances with the instructor.
  3. Place reinforcing steel, corner bars, and dowels exactly as detailed on the approved drawings; keep specified concrete cover.
  4. Request required inspection before concrete placement. Place and consolidate concrete using the instructor’s sequence, then protect it during curing.

Rebar size, spacing, laps, footing dimensions, concrete strength, and inspection steps come from the approved plans and local code.

03
WALL LAYOUT · STUDS

Lay out a straight wall

A basic 20 ft wall at 16 in. on center.

Realistic example of evenly spaced studs assembled between wall plates on a workshop floor
See the plates, repeated stud spacing, and both ends. The 20-foot count below is a separate math example.
Close-up example of two studs, a tape measure, and layout marks on a wood plate
On-center spacing is measured between stud centerlines; the clear opening between faces is smaller.
  1. Check the wall length and mark both plates from the same end.
  2. For 16 in. O.C., mark 16 in. center spacing. Many layouts mark the first stud edge at 15¼ in. so the center lands at 16 in.; follow the layout convention your instructor assigns.
  3. Use a square to carry marks across both plates. Mark an X on the side where each stud goes.
  4. Count spaces, then add the end stud. Add corners, intersections, openings, backing, and specified waste separately.

Math check: 24 ft wall → 288 ÷ 16 = 18 spaces → 19 studs for a simple end-to-end layout. 24 in. O.C. → 12 spaces → 13 studs.

04
WALL FRAMING · CORNERS

Frame and check a wall corner

Identify plates, corner studs, wall intersections, and backing before sheathing.

Realistic example of two framed wood walls meeting at a right angle
Look for aligned plates, corner studs, and backing for the interior finish.
  1. Lay plates together and transfer the corner and intersecting-wall locations from the plan.
  2. Mark stud centers and opening locations on both plates; keep the reference end consistent.
  3. Assemble the corner so the specified nailing and finish backing are present.
  4. Stand the wall only with the instructor’s approved lifting, bracing, and fastening plan; check plumb and square before securing.

Corner configurations vary by wall assembly and finish requirements. Follow the project details.

05
DOOR · PREHUNG INTERIOR

Install a prehung door

Set the jamb plumb and square before fastening the assembly.

Prehung door jamb dry-fitted in a rough opening with shims, a spirit level, tape measure, and hammer
Use shims behind the jamb at fastening points; keep checking the reveal and swing.
  1. Confirm the door size, handing, swing, floor clearance, and required rating. Check the rough opening against the manufacturer’s instructions.
  2. Inspect the opening for plumb, level, square, and solid fastening locations. Dry-fit the unit and protect the finished floor.
  3. Set the hinge jamb first. Shim behind each hinge, check plumb, then level the head and adjust the latch jamb for an even reveal.
  4. Fasten through the jamb at the specified points without pulling it out of alignment. Rehang or test the door and adjust until it swings and latches freely.
  5. For exterior doors, install sill pan and flashing and air-seal the perimeter according to the door maker and wall detail.

Opening changes, fire-rated doors, exterior water management, fasteners, and clearances must follow approved plans, product instructions, and local requirements.

06
WINDOW · ROUGH OPENING

Frame and install a window

Know the opening parts, then follow the window maker’s instructions.

Framed window rough opening with header, side studs, sill, and short studs below
Identify the header, king and jack studs, rough sill, and cripples before choosing an installation method.
Three illustrated window installation methods: flanged new construction, insert replacement, and full-frame replacement
Compare how the wall and existing frame change with each method.

1 · New construction with nailing flange

Use when: The wall is open or the rough opening is new.

Sequence: Prepare the opening and sill pan; set and fasten the unit per its instructions; integrate sill, jamb, and head flashing with the water-resistive barrier so laps shed outward; check square, operation, and seal.

2 · Insert / pocket replacement

Use when: The existing frame is sound and the new unit fits inside it.

Sequence: Remove sash and hardware; inspect the retained frame for rot, leaks, and square; set the insert, shim, and fasten as specified; insulate and seal the interior perimeter without blocking drainage paths.

3 · Full-frame replacement

Use when: The existing frame is damaged, leaking, or being replaced down to the rough opening.

Sequence: Remove sash and old frame; repair the opening and water barrier; install sill flashing; set, shim, and fasten the new unit; integrate jamb and head flashing, then insulate and finish.

Do not enlarge or alter a structural opening without an approved design and authorization. Follow the window maker, approved plans, flashing details, and local code; methods and flashing sequences vary by product.

07
ROOFING · SHINGLE LAYOUT

Lay out shingle courses

Recognize the starter, stagger, eave edge, and ridge sequence.

Asphalt shingles laid in straight courses on a low roof training mock-up with chalklines and drip edge
Study the starter course, offset joints, chalk guides, and edge metal on the training mock-up.
  1. Review the roofing manufacturer’s instructions and the roof safety plan before access.
  2. Check the deck, underlayment, drip edge, and starter course against the project detail.
  3. Snap layout lines and keep shingle joints offset by the pattern required for the product.
  4. Use the specified fasteners and placement; finish eaves, valleys, and ridge details to the approved assembly.

Roof work requires fall protection and site-specific training. Follow the roofing product instructions, approved plans, and instructor direction.

08
EXTERIOR · SIDING

Start siding straight and shed water

Follow a level starter and maintain the wall assembly’s clearances.

Horizontal siding courses installed over a weather barrier beside a trimmed window, with hand tools set nearby
Observe the weather barrier, starter strip, level courses, corner post, and window trim.
  1. Confirm the water-resistive barrier, flashing, and substrate are ready for the selected siding.
  2. Establish a level starter line and check the required clearances at grade, rooflines, and openings.
  3. Install courses with the specified overlap and fastening pattern; allow movement where the product requires it.
  4. Coordinate siding with window, door, and corner details so water laps outward.

Siding details vary by product and wall assembly. Use the manufacturer’s instructions and approved project details.

09
EXTERIOR TRIM · ALUMINUM CAPPING

Measure, bend, and fit trim coil

Protect sound wood trim with a fitted metal cover.

Realistic example of aluminum trim capping around a window with brake-bent coil stock and snips
Inspect the bent profile, return, and the sound trim it covers.
  1. Inspect and repair the wood trim first. Do not cap over rot, trapped moisture, or failed flashing.
  2. Measure the face and returns; allow hems and bends according to the brake and trim profile.
  3. Cut coil stock with the proper tool and gloves. Form clean hems and drip edges with a siding brake.
  4. Fit without blocking drainage. Fasten at approved locations, overlap joints to shed water, and seal only where the detail requires it.

Use eye and cut-resistant hand protection. Follow coil, brake, and fastening instructions; sharp metal edges can cause serious cuts.

10
FLOORING · LAYOUT & INSTALLATION

Start straight and keep joints staggered

Example sequence for a floating plank floor; product methods vary.

Realistic example of flooring rows with staggered joints, perimeter spacers, and prepared subfloor
Follow the straight starting row, staggered end joints, and perimeter space.
  1. Read the flooring instructions. Confirm subfloor condition, moisture limits, acclimation, underlayment, and required expansion space.
  2. Measure the room and plan row widths so the first and last rows fit; establish a straight reference line.
  3. Install the first row straight, maintain the specified perimeter gap, and stagger end joints by the product’s minimum.
  4. Use the required click, nail, staple, or adhesive method. Keep joints tight without forcing planks.
  5. Finish transitions and trim without pinning a floating floor. Check the finished surface and clean per product directions.

This is a learning sequence, not a product specification. Follow the flooring manufacturer and instructor for exact gaps, moisture limits, and fastening.

All structural dimensions and installation details must be verified against the approved plans, product instructions, code requirements, and instructor direction.