Wall framing anatomy diagrams for doors and windows, header sizing guide, and an interactive framing calculator that produces a full bill of materials with 2026 lumber pricing.
Wall Framing Anatomy
Door Opening Framing
Window Opening Framing
Top / Bottom Plate — horizontal members at wall top & bottom
King Stud — full-height stud each side of opening
Jack / Trimmer — shorter stud that carries the header
Header — doubled lumber spanning the opening
Cripple Stud — short studs above header or below sill
Prescriptive minimums per standard residential framing. Non-load-bearing walls: a single 2×4 flat is typically sufficient for spans up to 5'. Always verify with local code and a structural engineer for commercial projects.
Span ≤ 3'-0"
2×4 doubled
+ ½" OSB spacer
3'-0" to 4'-0"
2×6 doubled
+ ½" OSB spacer
4'-0" to 6'-0"
2×8 doubled
+ ½" OSB spacer
6'-0" to 8'-0"
2×10 doubled
+ ½" OSB spacer
8'-0" to 12'-0"
2×12 doubled
+ ½" OSB spacer
Over 12'-0"
LVL Beam
Engineer required
🔧 Interactive Framing Calculator
Door: 24–72" · Win: 12–120"
Std door: 80" · Win: varies
Typical: 24"–44" · ADA: 15"–48"
8' = 97" · 9' = 109"
↑ Enter your opening dimensions above and click Calculate
Calculate board feet, estimate lumber quantities, and reference nominal vs actual dimensions for standard dimensional lumber.
Understanding Lumber Dimensions — Nominal vs Actual
⚠ A "2×4" is NOT 2 inches by 4 inches. Lumber is named by its rough-sawn nominal size before it is dried and surfaced (planed smooth). Kiln-drying shrinks the wood, and surfacing removes more material. The result is the smaller actual size you buy at the lumber yard. Select sizes below to compare.
Add multiple pieces to build a complete lumber takeoff list.
Find the minimum lumber size required to span a given distance. Based on IRC 2021 prescriptive span tables for light-frame residential construction.
⚠ Engineering Notice: These values are IRC prescriptive maximums for typical residential loading. Commercial projects, unusual loads, or spans exceeding table limits require a licensed structural engineer.
Feet (clear distance between supports)
Calculate stair geometry and verify IRC code compliance. Enter the floor-to-floor height to get riser count, riser height, tread depth, total run, and stringer length.
ADA Standards for Accessible Design (2010 ADA) quick-reference. Select a category to view the diagram and critical dimensions. Always verify with the current ADA Standards and local accessibility codes.
Source: 2010 ADA Standards for Accessible Design · ADASAD · Always confirm with the authority having jurisdiction (AHJ).
IRC 2021 residential code highlights — the 40 items every drafter and designer looks up most. Not exhaustive. Always verify with local jurisdiction and current adopted code edition.
🏠 Room & Space Requirements
GeneralIRC R305.1
Habitable spaces: 7'-0" min ceiling height for 50% of required floor area.
Halls, bathrooms: 6'-8" min at point of use
GeneralIRC R304.1
Bedroom: 70 sq ft min floor area · 7'-0" min in any horizontal direction.
GeneralIRC R311.6
Hallway clear width: 36" minimum for the length of the hallway.
GeneralIRC R304.3
Efficiency dwelling: 220 sq ft min for two occupants + 100 sq ft each additional.
GeneralIRC R807.1
Attic access: 22"×30" min opening where attic is > 30 sq ft and > 30" high. 30" clear above opening.
GeneralIRC R408.4
Crawl space access: 18"×24" min opening through floor or perimeter wall.
🚪 Egress Requirements
EgressIRC R310.2
Emergency escape window: 5.7 sq ft net clear (5.0 sq ft for grade/basement floor).
Min height 24" · Min width 20" · Max sill 44" AFF
EgressIRC R311.2
Egress door: 32" min clear width × 78" min clear height. One required from each dwelling unit.
EgressIRC R310.1
Emergency escape required from every sleeping room and from basements with sleeping rooms.
EgressIRC R311.7.1
Stairway min clear width: 36" above handrail · 31.5" below handrail if one side · 27" if both sides.
EgressIRC R311.7.8
Handrail height: 34" to 38" AFF measured vertically above stair nosings. Required both sides > 44" wide.
EgressIRC R312.1
Guards (railings): 36" min height at open sides of floor >30" above grade. 4" max baluster spacing.
⚡ Electrical Safety (GFCI & AFCI)
GFCIIRC E3902.1
GFCI required: all bathroom receptacles, regardless of distance from water source.
GFCIIRC E3902.6
GFCI required: kitchen countertop receptacles · also any outlet within 6' of a sink.
GFCIIRC E3902.2–4
GFCI required: all garage, outdoor, crawl space, and unfinished basement receptacles.
AFCIIRC E3902.12
AFCI required: all 120V, 15A and 20A branch circuits throughout the dwelling unit.
OutletsIRC E3901.2
Receptacle spacing: no point along floor line more than 6' from an outlet. Within 6' of doorway on same wall.
OutletsIRC E3901.4
Countertop outlets: every 4' of countertop length · within 2' of any countertop section end.
🔥 Fire & Life Safety
SmokeIRC R314.3
Smoke alarms required: inside each sleeping room · outside each sleeping area · each level incl. basement.
COIRC R315.2
CO alarms: outside each sleeping area · each level when any fuel-burning appliance is present.
InterconnectIRC R314.5
New construction: smoke alarms must be interconnected (all sound when one triggers). Hardwired w/ battery backup.
GarageIRC R302.5.1
Garage-to-house door: 20-minute fire rated · self-closing · self-latching. No openings to sleeping rooms.
TownhouseIRC R302.2
Townhouse unit separation: 1-hour fire-rated wall assembly from foundation to underside of roof sheathing.
DryerIRC M1502
Dryer exhaust duct: rigid metal only · 4" dia · 25' max length (subtract 5' per 90° elbow, 2.5' per 45°).
💨 Ventilation & Mechanical
BathIRC M1505.4
Bathroom exhaust: 50 cfm intermittent or 20 cfm continuous to exterior. OR operable window (no duct req'd).
KitchenIRC M1505.4
Kitchen exhaust: 100 cfm intermittent or 25 cfm continuous. Range hoods to exterior preferred.
AtticIRC R806.2
Attic ventilation: 1/150 of attic floor area as net free vent area (1/300 if vapor barrier or balanced).
CrawlIRC R408.1
Crawl space vents: 1/150 of crawl area. Max 6' from each corner. OR unvented with insulation at perimeter.
WH SeismicIRC P2801.8
Water heater seismic strapping: required in SDC C–F (most of California, Pacific NW, and high-seismic areas).
CombustionIRC G2407
Gas appliance combustion air: calculated based on appliance BTU input and space volume. Cannot be taken from sleeping rooms.
🪟 Glazing & Openings
SafetyIRC R308.4
Safety glazing required within 24" of door opening · in wet areas (tubs/showers) · within 18" of floor if > 9 sq ft.
SkylightIRC R308.6
Skylights: tempered or laminated safety glass required. Screens do not substitute for safety glazing.
GarageIRC R302.5
No glazing permitted in a fire-rated wall between garage and dwelling unit. Opaque wall required.
SolarIECC R402.3
Window U-factor and SHGC limits apply by climate zone. See Insulation tab for zone requirements.
Source: IRC 2021 · IBC 2021 · NEC 2023. Local amendments may be more restrictive. Always verify the adopted code edition and local amendments with your building department before design.
Standard rough-in heights for plumbing and electrical. All dimensions are to center of pipe or box unless noted. Confirm with local codes and manufacturer requirements before framing.
🔧 Plumbing Rough-In Heights
Fixture
Height AFF
Notes
Toilet drain (CL)
Floor (0")
12" from finished wall standard rough-in
Toilet water supply
6–8"
6" to left of toilet CL
Lav / sink drain
18–20"
Center of drain tailpiece
Lav / sink supply
21–23"
Hot left, cold right — 8" apart
Kitchen sink drain
18–20"
Centered under sink
Kitchen sink supply
22–24"
Hot left, cold right
Shower / tub valve
48" (shower) · 26–28" from tub floor (tub)
Center of trim plate · verify with mfr
Showerhead
78–80"
Adjustable arm — verify with mfr
Washer supply/drain
Supply 48" · Drain standpipe 36–42"
Standpipe min 30" above trap
Hose bib (exterior)
12–18"
Above frost line, slope to drain
Ice maker / fridge
24–32"
Behind appliance — ¼" OD copper
Device
Height AFF
Notes
Standard outlet
12"
Center of box — industry standard practice
GFCI outlet (bathroom)
36–42"
Within 36" of basin, min 12" AFF
Countertop outlet
44"
18" above 36" counter · not over cooktop
Switch
48"
ADA max 48" (reach range) · min 15"
Thermostat
48–60"
Away from supply registers and exterior walls
Panel (top breaker)
78" max
NEC 240.24 — max height of handle
Panel (bottom breaker)
12" min
36" clear work space, 30" wide, 78" high
Dryer outlet (240V)
30"
4-wire 30A NEMA 14-30R behind unit
Range outlet (240V)
36"
4-wire 50A NEMA 14-50R behind unit
Outdoor GFCI outlet
12–18"
Weatherproof cover · in-use cover req'd
Smoke alarm
Per code (ceiling or top of wall)
Ceiling: anywhere · Wall: 4"–12" from ceiling
⚠ Heights shown are standard practice. ADA-accessible design may require modifications (all controls 15"–48" AFF). Always confirm with the NEC, IRC, and local utility requirements.
CMU coursing calculator, brick count estimator, and reference dimensions for standard masonry units. All CMU heights assume standard 3/8" mortar joints.
CMU Coursing Calculator
Standard 8" CMU: 7-5/8" block + 3/8" mortar joint = 8" per course. Enter a target height to find the number of courses and nearest achievable height.
Inches (e.g. 96" = 8')
Feet
Brick Count Calculator
Subtract openings (doors, windows)
Typically 10% for cutting waste
CMU Size Reference
4" CMU
3-5/8" H × 7-5/8" H × 15-5/8" L Nominal: 4"×8"×16" 4" per course
6" CMU
5-5/8" W × 7-5/8" H × 15-5/8" L Nominal: 6"×8"×16" 8" per course
8" CMU
7-5/8" W × 7-5/8" H × 15-5/8" L Nominal: 8"×8"×16" 8" per course
10" CMU
9-5/8" W × 7-5/8" H × 15-5/8" L Nominal: 10"×8"×16" 8" per course
12" CMU
11-5/8" W × 7-5/8" H × 15-5/8" L Nominal: 12"×8"×16" 8" per course
Brick Size Reference
Brick Name
Nominal (W×H×L)
Actual
Courses per 8"
Bricks/sq ft
Modular
4"×2-2/3"×8"
3-5/8"×2-1/4"×7-5/8"
3
6.75
Standard
4"×2-2/3"×8"
3-3/4"×2-1/4"×8"
3
6.25
Engineer
4"×3-1/5"×8"
3-5/8"×2-13/16"×7-5/8"
2.5
8.64
Roman
4"×2"×12"
3-5/8"×1-5/8"×11-5/8"
4
5.14
Norman
4"×2-2/3"×12"
3-5/8"×2-1/4"×11-5/8"
3
4.50
King
4"×2-5/8"×9-5/8"
3"×2-5/8"×9-5/8"
3
4.80
Jumbo
4"×4"×8"
3-5/8"×3-5/8"×7-5/8"
2
3.90
Key fact: 3 courses of modular brick = 8" — exactly one CMU course. This is why modular brick coordinates perfectly with concrete block construction.
IECC 2021 minimum R-value and U-factor requirements by climate zone. Select your zone to highlight requirements. Many states have adopted stricter values — verify with your local energy code.
Select Your Climate Zone
IECC 2021 Minimum R-Values by Assembly
Assembly
Zone 1
Zone 2
Zone 3
Zone 4
Zone 5
Zone 6
Zone 7
Zone 8
Attic (above-deck)
R-30
R-38
R-38
R-49
R-49
R-49
R-49
R-49
Wood-frame wall
R-13
R-13
R-20 or R-13+5ci
R-20 or R-13+5ci
R-20+5ci or R-13+10ci
R-20+5ci or R-13+10ci
R-20+10ci
R-20+10ci
Floor over uncond. space
R-13
R-13
R-19
R-19
R-30
R-30
R-38
R-38
Slab edge insulation
—
—
R-10 (2' deep)
R-10 (2' deep)
R-10 (4' deep)
R-10 (4' deep)
R-10 (4' deep)
R-10 (4' deep)
Crawl space wall
R-13
R-13
R-19
R-19
R-30
R-30
R-38
R-38
Windows (max U-factor)
0.40
0.40
0.30
0.30
0.27
0.27
0.27
0.27
Doors (max U-factor)
0.40
0.40
0.30
0.30
0.27
0.27
0.27
0.27
Window SHGC (max)
0.25
0.25
0.25
0.40
NR
NR
NR
NR
ci = continuous insulation · NR = No Requirement · Values for wood-frame residential construction (R-402.1.2). Your zone highlighted in table above.
Insulation Types — R-Value per Inch
Fiberglass Batt
R-2.9
per inch
2×4 wall ≈ R-13 · 2×6 wall ≈ R-21 · Most common, lowest cost · Requires proper installation for full R-value
Mineral Wool Batt
R-3.7
per inch
2×4 wall ≈ R-15 · 2×6 wall ≈ R-23 · Fire resistant · Better soundproofing than fiberglass · Moisture resistant
Blown Fiberglass
R-2.5
per inch
Attics and walls (dense-pack) · Settles over time · Good for irregular spaces · Machine required
Blown Cellulose
R-3.5
per inch
Recycled paper · Good air sealing · Settles 20% · Requires vapor barrier in high-humidity climates
Open-Cell Spray Foam
R-3.7
per inch
Excellent air sealing · Good for complex geometry · Vapor permeable · Lower density (0.5 pcf) · Requires vapor barrier in cold climates
Closed-Cell Spray Foam
R-6.5
per inch
Highest R/inch · Vapor barrier built-in · Structural benefit · 2" min for vapor control · Most expensive option
Rigid EPS (Type II)
R-3.8
per inch
White foam board · Good for below-grade and exterior continuous insulation · Water resistant · Common for slab edge
Rigid XPS
R-5.0
per inch
Blue/pink foam board · Best moisture resistance · Common below grade and under slabs · R-value stable over time
Rigid Polyiso
R-6.0
per inch
Highest R/inch of rigid boards · Foil-faced · Use above grade only (moisture sensitive) · Excellent for roofs and walls as ci
Key Formulas
U-factor = 1 ÷ Total R-value · Total R = R-insulation + R-sheathing + R-drywall + R-air films
R-air film exterior: R-0.17 · R-air film interior: R-0.68 · R-drywall (½"): R-0.45 · R-OSB (7/16"): R-0.62
Example 2×6 wall: R-21 batt + R-0.62 OSB + R-0.45 drywall + films = R-23.7 total · U = 1/23.7 = 0.042
🏗 Visual Assembly Guide — Where Insulation Goes
Select an assembly to see a cross-section showing every layer, insulation placement, vapor barrier location, and common mistakes to avoid.
Click any assembly button above.
🔑 Core Principles Every Architect Must Know
Vapor Barrier — Always on the Warm Side
Cold climates (zones 4–8): vapor retarder on the interior face of insulation. Hot-humid climates (zones 1–3): vapor barrier on the exterior. Never trap moisture between two vapor barriers — it causes rot and mold.
Air Sealing ≠ Insulation
Insulation resists conduction. Air sealing stops convection. An R-38 attic with air leaks loses far more energy than a sealed R-30 attic. Seal ALL penetrations (pipes, wires, top plates) before insulating.
Thermal Bridging Lowers Real R-Value
Wood studs (R-1.25/in) break up insulation at 16" o.c. framing. Real 2×6 wall = ~R-19 effective, not R-21. Add exterior continuous insulation (ci) to cover the studs and eliminate bridging.
Attic Baffles Are Non-Negotiable
Without baffles at the eave, blown insulation blocks soffit vents and traps moisture. Install baffles from soffit to 1" above insulation before blowing. Min 1" air channel must remain open from soffit to ridge.
Insulate at the Thermal Boundary
The thermal boundary = the line between conditioned and unconditioned space. Insulate AND air-seal ONLY at this boundary. An uninsulated attic hatch cancels ~10% of the attic's insulation value.
Crawl Space: Seal the Ground First
Ground moisture is the #1 enemy of crawl spaces. 6-mil poly vapor barrier on the soil, lapped 12" at seams, taped to foundation walls. Without it, insulation above absorbs moisture and loses R-value.
Architectural line weights, standard hatch patterns with visual previews, layer naming conventions, and common drawing abbreviations. Matches AIA and standard AutoCAD practice.
Line Weight Hierarchy
Extra Heavy — Cut line / Profile0.60–0.70 mm
Heavy — Major visible edge0.40–0.50 mm
Medium — Visible edges / objects0.25–0.35 mm
Light — Dimensions / notes0.18–0.20 mm
Extra Light — Hatching / fill0.09–0.13 mm
Hatch Pattern Reference — Visual Preview
ANSI31
General section cut · Concrete · Common default
ANSI32
Steel sections · Metal fill
AR-B816
Brick — running bond
AR-CONC
Concrete with aggregate
EARTH
Earth / soil fill · Grade
INSUL
Batt insulation · Wall cavity
STEEL (grid)
Metal · Steel plates
WOOD
Wood grain — plan view
AR-SAND
Sand · Fine aggregate · Fill
TRIANG
Glass · Water · Glazing
BRASS
Brass · Copper · Non-ferrous
GRAVEL
Gravel · Drain rock · Base
AIA Layer Color Standards (Quick Ref)
Layer Prefix
Discipline
AIA Color #
Common Layers
A-
Architectural
1 Red / 7 White
A-WALL, A-DOOR, A-GLAZ, A-FLOR, A-ROOF, A-ANNO
S-
Structural
3 Green
S-BEAM, S-COLS, A-SLAB, S-FOTN, S-GRID
M-
Mechanical
5 Blue
M-DUCT, M-PIPE, M-EQPM, M-ANNO
P-
Plumbing
6 Magenta
P-PIPE, P-FIXT, P-EQPM
E-
Electrical
2 Yellow
E-POWR, E-LITE, E-COMM, E-FIRE, E-ANNO
C-
Civil/Site
4 Cyan
C-TOPO, C-ROAD, C-PKNG, C-UTIL, C-ANNO
L-
Landscape
92 Lt Green
L-PLNT, L-IRRG, L-HARD, L-ANNO
X-
Existing (demo)
8 Gray
X-WALL, X-DEMO (prefix any layer)
Common Drawing Abbreviations
AFFAbove Finish Floor
BFFBelow Finish Floor
CL / ¢Centerline
CLGCeiling
CMUConcrete Masonry Unit
CONCConcrete
DIA / ØDiameter
DNDown (stair)
E.Q.Equal
EL / ELEVElevation / Elev height
EWCElectric Water Cooler
F.D.Floor Drain
F.F.Finish Floor
FECFire Extinguisher Cabinet
FFEFinish Floor Elevation
FHFire Hose / Hydrant
FOFace of / Finish Opening
G.C.General Contractor
GWBGypsum Wall Board
H.M.Hollow Metal (door)
HVACHeating/Ventilating/AC
INVInvert elevation (pipe)
LVLLaminated Veneer Lumber
MAXMaximum
MDFMedium Density Fiberboard
MINMinimum
MTLMetal
N.I.C.Not In Contract
N.T.S.Not To Scale
O.C.On Center
O.H.Overhead
OSBOriented Strand Board
PTPressure Treated
R.O.Rough Opening
SIMSimilar
S.S.Stainless Steel / Sanitary Sewer
T.O.Top of (slab, wall, etc.)
T.Y.P. / TYPTypical
U.O.N.Unless Otherwise Noted
V.I.F.Verify In Field
Common structural connectors used in light-frame wood construction. Values shown are representative — always verify with the manufacturer's current load tables and local code requirements.
⚠ Load values vary by lumber species, nail size/count, and installation conditions. Use only values from current Simpson Strong-Tie or USP catalog for engineered designs. IBC/IRC requires connectors to be installed per manufacturer instructions.
Joist / Rafter Hanger
LUS26 · LUS28 · LUS210 · LUS212
Supports floor/ceiling joist or rafter at header or ledger. Uplift capacity: 395–730 lbs. Download: 1,300–3,570 lbs depending on size and nailing.
Top-Mount Joist Hanger
LSSU / THSU / JUS Series
Installs from top of header — used where face-nailing is not possible. Good for I-joist and LVL applications. Skewable models available (LSSU).
I-Joist / LVL Hanger
IUS / LUS-LVL / HU Series
Designed for engineered lumber — wider seat, no seat-cut required. Available in 9.5", 11.25", 14", 16" I-joist depths. Use NAILS per schedule only.
Adjustable Post Base
ABA44 · ABA46 · ABU44 · ABU66
Elevates post 1" above concrete — prevents moisture contact and decay. Anchor bolt sets in wet concrete. Uplift: 1,940 lbs (4×4). Min post embedment 3/4" into standoff.
Post Cap / Beam Cap
BC40 · BC6 · PCZ44 · PCZ46
Connects beam to top of post. U-shaped bracket — beam drops in, nailed through sides. Uplift: 2,455 lbs (BC6). Lateral: 765 lbs. Use for deck beams, ridge beams.
Column / Steel Post Base
CBSQ · PBS44 · PABS Series
Heavy-duty standoff base for 4×4 to 8×8 posts. Hot-dip galvanized for exterior. Anchor bolt with nut and washer set in concrete. Min 3,000 psi concrete.
Hurricane / Rafter Tie
H2.5A · H3 · H10S · LTP4
Connects rafter or truss to top plate. Resists wind uplift. H2.5A uplift: 500 lbs. Required in high-wind and seismic zones — often required by code every rafter.
Hold-Down Anchor
HDU2 · HDU5 · PHD2 · STHD10
Resists shear wall overturning forces. Bolts through end studs to anchor rod in foundation. Required at shear wall boundaries. Uplift capacity: 2,000–14,000+ lbs.
Framing Angle / Bracket
A34 · A35 · A23 · LS series
90° angle connector for stud-to-plate, blocking, and ledger connections. A35: 475 lbs lateral. Use pairs for higher loads. Common for non-structural blocking and bracing.
Flat Tension Strap
LSTA · MSTA · CS16 · CS18
Spans across joints to transfer tension loads (roof uplift, shear wall). LSTA24: 1,840 lbs. CS16: 3,925 lbs. Install both sides of joint for full value.
Overlap / Stud Plate Tie
SPT2 · RT7 · LTP4
Connects parallel framing members. Ties doubled studs, carries lateral loads across plate joints. LTP4: 820 lbs lateral. Typically used at every stud in high-seismic zones.
Mudsill / Anchor Strap
MST48 · MST60 · MSTAM
Wraps around mudsill and connects to concrete anchor bolt. Used in seismic zones where hold-down is not required. MST48: 3,465 lbs uplift. Install one side minimum.
All product codes are Simpson Strong-Tie examples. USP Structural Connectors and other manufacturers offer equivalent products. Always install per manufacturer instructions with specified fasteners. Load values are approximate — use current catalog values for engineered designs. strongtie.com
Interactive checklists for each phase of a residential project. Check items as you complete them — use the Print button to create a paper copy for the job file.
0 of 0 items completed
Build a room finish schedule matching the format used on a set of construction drawings. Add rooms, assign materials, then generate and print the formatted schedule.
Room #
Room Name
Floor
Base
Walls
Ceiling
Notes
Finish Schedule Notes
Abbreviations: PT = Paint · CT = Ceramic Tile · PT-T = Porcelain Tile · LVP = Luxury Vinyl Plank · HW = Hardwood
CPT = Carpet · GWB = Gypsum Wallboard · ACT = Acoustical Ceiling Tile · ES = Exposed Structure · WB = Wood Base
This schedule format matches AIA A201 requirements for a construction document set.
Calculate rough opening sizes for doors and windows, header sizing by span, and reference standard dimensions for residential and commercial applications.
Rough Opening Calculator
Common: 24, 28, 30, 32, 36, 48, 60, 72"
Standard door: 80" (6'-8")
ADA: 15"–48" for reach range
Header Sizing by Span
Calculate concrete volume for footings and foundations, and reference standard foundation types for residential and commercial construction.
Concrete Volume Calculator
Enter in inches
Typical: 5–10%
Concrete Formulas
Rectangular: Volume (cu ft) = L × W × (D÷12) → ÷ 27 = cubic yards
Circular pier: V = π × (r²) × H → ÷ 27 = cu yd | 1 cu yd = 27 cu ft
Standard bag coverage: 60 lb bag ≈ 0.45 cu ft | 80 lb bag ≈ 0.60 cu ft
Ready-mix is ordered in cubic yards. Minimum delivery typically 1 yd³.
Calculate room areas and running totals for square footage takeoffs. Supports rectangular rooms, L-shapes (two rectangles), and triangular areas.
Area List Builder
Total Area
0.00 ft²
Add rooms above then totals appear here
Area Formulas
Rectangle: A = L × W | Triangle: A = (B × H) ÷ 2
L-Shape: split into two rectangles and add totals
1 sq ft = 144 sq in | 1 sq yd = 9 sq ft | 1 acre = 43,560 sq ft
Material Estimator
Use total square footage to estimate material quantities.
ADA Accessible Door Width: Minimum 32" clear (measured from face of door to opposite stop at 90° open). A 3'-0" door with standard hardware provides ≈ 33-3/4" clear. For new construction, 36" minimum clear is recommended per ADA guidelines.
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