[{"data":1,"prerenderedAt":872},["ShallowReactive",2],{"catalog":3,"page:\u002Fwoodworking\u002Fstair-calculator":294},[4,55,76,108,129,165,197,247,280],{"path":5,"stem":6,"title":7,"short":8,"icon":9,"order":10,"calculators":11},"\u002Fwoodworking","woodworking\u002Findex","Woodworking Calculators","Board feet, stairs, deck boards, tape measure fractions and decimals.","i-lucide-hammer",1,[12,19,25,31,37,43,49],{"path":13,"stem":14,"title":15,"short":16,"icon":17,"hub":18},"\u002Fwoodworking\u002Fboard-foot-calculator","woodworking\u002Fboard-foot-calculator","Board Foot Calculator","Board feet, cost and waste for a list of boards, hardwood or softwood.","i-lucide-ruler-dimension-line","woodworking",{"path":20,"stem":21,"title":22,"short":23,"icon":24,"hub":18},"\u002Fwoodworking\u002Fdeck-board-calculator","woodworking\u002Fdeck-board-calculator","Deck Board Calculator","Deck boards, linear feet, joists and screws for any deck size.","i-lucide-rows-3",{"path":26,"stem":27,"title":28,"short":29,"icon":30,"hub":18},"\u002Fwoodworking\u002Ffraction-to-decimal-chart","woodworking\u002Ffraction-to-decimal-chart","Fraction to Decimal Chart (Inches)","Every 64th of an inch as a decimal and in mm, with a two-way converter.","i-lucide-decimals-arrow-right",{"path":32,"stem":33,"title":34,"short":35,"icon":36,"hub":18},"\u002Fwoodworking\u002Fhow-to-read-a-tape-measure","woodworking\u002Fhow-to-read-a-tape-measure","How to Read a Tape Measure","Tap any mark on an interactive tape to see its fraction, decimal and mm.","i-lucide-pencil-ruler",{"path":38,"stem":39,"title":40,"short":41,"icon":42,"hub":18},"\u002Fwoodworking\u002Fplywood-calculator","woodworking\u002Fplywood-calculator","Plywood Calculator","Plywood and OSB sheets for subfloors, walls and roofs, with cost.","i-lucide-layers",{"path":44,"stem":45,"title":46,"short":47,"icon":48,"hub":18},"\u002Fwoodworking\u002Frafter-calculator","woodworking\u002Frafter-calculator","Rafter Calculator","Common rafter length, angle and ridge height for any span and pitch.","i-lucide-house",{"path":50,"stem":51,"title":52,"short":53,"icon":54,"hub":18},"\u002Fwoodworking\u002Fstair-calculator","woodworking\u002Fstair-calculator","Stair Calculator","Risers, treads, total run and stringer length from the total rise.","i-lucide-chart-no-axes-column-increasing",{"path":56,"stem":57,"title":58,"short":59,"icon":60,"order":61,"calculators":62},"\u002Fresin-and-candles","resin-and-candles\u002Findex","Resin & Candle Making Calculators","Epoxy volumes and mix ratios, candle wax and fragrance oil.","i-lucide-flask-conical",2,[63,70],{"path":64,"stem":65,"title":66,"short":67,"icon":68,"hub":69},"\u002Fresin-and-candles\u002Fcandle-wax-calculator","resin-and-candles\u002Fcandle-wax-calculator","Candle Wax Calculator","Wax and fragrance oil by weight for any jar size and batch.","i-lucide-flame","resin-and-candles",{"path":71,"stem":72,"title":73,"short":74,"icon":75,"hub":69},"\u002Fresin-and-candles\u002Fepoxy-resin-calculator","resin-and-candles\u002Fepoxy-resin-calculator","Epoxy Resin Calculator","Resin for molds, river tables and tabletop coats, split into A and B.","i-lucide-droplets",{"path":77,"stem":78,"title":79,"short":80,"icon":81,"order":82,"calculators":83},"\u002Fquilting","quilting\u002Findex","Quilting Calculators","Backing, binding, half-square triangles and quilt sizes.","i-lucide-grid-3x3",3,[84,91,96,102],{"path":85,"stem":86,"title":87,"short":88,"icon":89,"hub":90},"\u002Fquilting\u002Fhalf-square-triangle-calculator","quilting\u002Fhalf-square-triangle-calculator","Half Square Triangle Calculator","Cutting sizes and square counts for 2-, 4- and 8-at-a-time HSTs.","i-lucide-triangle-right","quilting",{"path":92,"stem":93,"title":94,"short":95,"icon":42,"hub":90},"\u002Fquilting\u002Fquilt-backing-calculator","quilting\u002Fquilt-backing-calculator","Quilt Backing Calculator","Yardage, panels and seam direction for any quilt back.",{"path":97,"stem":98,"title":99,"short":100,"icon":101,"hub":90},"\u002Fquilting\u002Fquilt-binding-calculator","quilting\u002Fquilt-binding-calculator","Quilt Binding Calculator","Strips to cut and fabric to buy for double-fold binding.","i-lucide-frame",{"path":103,"stem":104,"title":105,"short":106,"icon":107,"hub":90},"\u002Fquilting\u002Fquilt-size-calculator","quilting\u002Fquilt-size-calculator","Quilt Size Calculator","Finished size from blocks and borders, or the right size for your bed.","i-lucide-bed-double",{"path":109,"stem":110,"title":111,"short":112,"icon":113,"order":114,"calculators":115},"\u002Fsewing-and-needlework","sewing-and-needlework\u002Findex","Sewing & Needlework Calculators","Fabric yardage, cutting plans and cross stitch fabric sizes.","i-lucide-scissors",4,[116,123],{"path":117,"stem":118,"title":119,"short":120,"icon":121,"hub":122},"\u002Fsewing-and-needlework\u002Fcross-stitch-fabric-calculator","sewing-and-needlework\u002Fcross-stitch-fabric-calculator","Cross Stitch Fabric Calculator","Finished design size and fabric to cut for any Aida or linen count.","i-lucide-grid-2x2-x","sewing-and-needlework",{"path":124,"stem":125,"title":126,"short":127,"icon":128,"hub":122},"\u002Fsewing-and-needlework\u002Ffabric-yardage-calculator","sewing-and-needlework\u002Ffabric-yardage-calculator","Fabric Yardage Calculator","Yards and meters to buy for any set of pieces, with a cutting plan.","i-lucide-ruler",{"path":130,"stem":131,"title":132,"short":133,"icon":134,"order":135,"calculators":136},"\u002Fknitting-and-crochet","knitting-and-crochet\u002Findex","Knitting & Crochet Calculators","Yarn yardage, gauge, blanket sizes, and needle and hook sizes.","i-lucide-spool",5,[137,143,149,154,159],{"path":138,"stem":139,"title":140,"short":141,"icon":107,"hub":142},"\u002Fknitting-and-crochet\u002Fcrochet-blanket-size-calculator","knitting-and-crochet\u002Fcrochet-blanket-size-calculator","Crochet Blanket Size Calculator","Blanket size chart plus the starting chain and rows at your gauge.","knitting-and-crochet",{"path":144,"stem":145,"title":146,"short":147,"icon":148,"hub":142},"\u002Fknitting-and-crochet\u002Fcrochet-hook-size-chart","knitting-and-crochet\u002Fcrochet-hook-size-chart","Crochet Hook Size Chart","US letters, millimeters and UK sizes for every hook, plus the yarn each suits.","i-lucide-fishing-hook",{"path":150,"stem":151,"title":152,"short":153,"icon":128,"hub":142},"\u002Fknitting-and-crochet\u002Fknitting-gauge-calculator","knitting-and-crochet\u002Fknitting-gauge-calculator","Knitting Gauge Calculator","Cast-on stitches and rows from your gauge, or rescale a pattern.",{"path":155,"stem":156,"title":157,"short":158,"icon":36,"hub":142},"\u002Fknitting-and-crochet\u002Fknitting-needle-size-chart","knitting-and-crochet\u002Fknitting-needle-size-chart","Knitting Needle Size Chart","US, metric and UK sizes for every knitting needle, plus the yarn each suits.",{"path":160,"stem":161,"title":162,"short":163,"icon":164,"hub":142},"\u002Fknitting-and-crochet\u002Fyarn-calculator","knitting-and-crochet\u002Fyarn-calculator","Yarn Calculator","Yards, meters and skeins for any project, worked out from your swatch.","i-lucide-scale",{"path":166,"stem":167,"title":168,"short":169,"icon":170,"order":171,"calculators":172},"\u002Fpool-and-aquarium","pool-and-aquarium\u002Findex","Pool, Pond & Aquarium Calculators","Pool and pond gallons, aquarium volume and fish stocking.","i-lucide-waves",6,[173,180,186,191],{"path":174,"stem":175,"title":176,"short":177,"icon":178,"hub":179},"\u002Fpool-and-aquarium\u002Faquarium-volume-calculator","pool-and-aquarium\u002Faquarium-volume-calculator","Aquarium Volume Calculator","Gallons, liters and weight for rectangle, bow front, cylinder and hex tanks.","i-lucide-container","pool-and-aquarium",{"path":181,"stem":182,"title":183,"short":184,"icon":185,"hub":179},"\u002Fpool-and-aquarium\u002Ffish-tank-stocking-calculator","pool-and-aquarium\u002Ffish-tank-stocking-calculator","Fish Tank Stocking Calculator","Check your fish list against the inch-per-gallon and surface-area rules.","i-lucide-fish",{"path":187,"stem":188,"title":189,"short":190,"icon":75,"hub":179},"\u002Fpool-and-aquarium\u002Fpond-volume-calculator","pool-and-aquarium\u002Fpond-volume-calculator","Pond Volume Calculator","Pond gallons, liner size and pump flow for any garden pond.",{"path":192,"stem":193,"title":194,"short":195,"icon":196,"hub":179},"\u002Fpool-and-aquarium\u002Fpool-volume-calculator","pool-and-aquarium\u002Fpool-volume-calculator","Pool Volume Calculator","Gallons and liters for round, oval, rectangle and kidney pools.","i-lucide-waves-ladder",{"path":198,"stem":199,"title":200,"short":201,"icon":202,"order":203,"calculators":204},"\u002Fgarden","garden\u002Findex","Garden & Landscape Calculators","Mulch, gravel, soil and sand, companion plants and garden plans.","i-lucide-leaf",7,[205,212,218,224,230,236,242],{"path":206,"stem":207,"title":208,"short":209,"icon":210,"hub":211},"\u002Fgarden\u002Fcompanion-planting-chart","garden\u002Fcompanion-planting-chart","Companion Planting Chart","Good and bad neighbors for 30 vegetables, herbs and flowers.","i-lucide-sprout","garden",{"path":213,"stem":214,"title":215,"short":216,"icon":217,"hub":211},"\u002Fgarden\u002Fgravel-calculator","garden\u002Fgravel-calculator","Gravel Calculator","Gravel for driveways, paths and patios in cubic yards, tons and bags.","i-lucide-mountain",{"path":219,"stem":220,"title":221,"short":222,"icon":223,"hub":211},"\u002Fgarden\u002Fmulch-calculator","garden\u002Fmulch-calculator","Mulch Calculator","Mulch for garden beds in cubic yards and 1.5, 2 or 3 cu ft bags.","i-lucide-trees",{"path":225,"stem":226,"title":227,"short":228,"icon":229,"hub":211},"\u002Fgarden\u002Fraised-bed-soil-calculator","garden\u002Fraised-bed-soil-calculator","Raised Bed Soil Calculator","Soil for any raised bed in cubic feet, cubic yards and bags.","i-lucide-shovel",{"path":231,"stem":232,"title":233,"short":234,"icon":235,"hub":211},"\u002Fgarden\u002Fsand-calculator","garden\u002Fsand-calculator","Sand Calculator","Sand for sandboxes, paver bases and leveling in tons and bags.","i-lucide-hourglass",{"path":237,"stem":238,"title":239,"short":240,"icon":241,"hub":211},"\u002Fgarden\u002Fsquare-foot-garden-planner","garden\u002Fsquare-foot-garden-planner","Square Foot Garden Planner","Plan a square foot garden square by square and count the plants.","i-lucide-layout-grid",{"path":243,"stem":244,"title":245,"short":246,"icon":210,"hub":211},"\u002Fgarden\u002Ftopsoil-calculator","garden\u002Ftopsoil-calculator","Topsoil Calculator","Topsoil for lawns, beds and leveling in cubic yards, tons and bags.",{"path":248,"stem":249,"title":250,"short":251,"icon":252,"order":253,"calculators":254},"\u002Fpets","pets\u002Findex","Pet & Backyard Animal Calculators","Cat and dog ages, puppy adult weight, and chicken coop space.","i-lucide-paw-print",8,[255,262,268,274],{"path":256,"stem":257,"title":258,"short":259,"icon":260,"hub":261},"\u002Fpets\u002Fcat-age-calculator","pets\u002Fcat-age-calculator","Cat Age Calculator","Cat years to human years, plus your cat's life stage.","i-lucide-cat","pets",{"path":263,"stem":264,"title":265,"short":266,"icon":267,"hub":261},"\u002Fpets\u002Fchicken-coop-size-calculator","pets\u002Fchicken-coop-size-calculator","Chicken Coop Size Calculator","Coop floor, run, roosts, nest boxes and vents for your flock.","i-lucide-egg",{"path":269,"stem":270,"title":271,"short":272,"icon":273,"hub":261},"\u002Fpets\u002Fdog-age-calculator","pets\u002Fdog-age-calculator","Dog Age Calculator","Dog years to human years by size, plus the epigenetic formula.","i-lucide-dog",{"path":275,"stem":276,"title":277,"short":278,"icon":279,"hub":261},"\u002Fpets\u002Fpuppy-weight-calculator","pets\u002Fpuppy-weight-calculator","Puppy Weight Calculator","Your puppy's likely adult weight, from its weight and age in weeks.","i-lucide-bone",{"path":281,"stem":282,"title":283,"short":284,"icon":285,"order":286,"calculators":287},"\u002Fhome-improvement","home-improvement\u002Findex","Home Improvement Calculators","Tile, boxes and grout for floors, walls and backsplashes.","i-lucide-paint-roller",9,[288],{"path":289,"stem":290,"title":291,"short":292,"icon":81,"hub":293},"\u002Fhome-improvement\u002Ftile-calculator","home-improvement\u002Ftile-calculator","Tile Calculator","Tiles, boxes and grout for floors, walls and backsplashes.","home-improvement",{"kind":295,"calculator":296},"calculator",{"id":297,"title":52,"body":298,"calculator":838,"description":839,"extension":840,"faq":841,"hub":18,"icon":54,"keyword":860,"meta":861,"navigation":862,"path":50,"related":863,"seo":868,"seoTitle":869,"short":53,"stem":51,"updated":870,"__hash__":871},"calculators\u002Fwoodworking\u002Fstair-calculator.md",{"type":299,"value":300,"toc":829},"minimark",[301,306,315,355,362,366,369,677,682,751,755,758,792,796],[302,303,305],"h2",{"id":304},"how-the-calculator-works","How the calculator works",[307,308,309,310,314],"p",{},"Measure the ",[311,312,313],"strong",{},"total rise"," from the finished floor at the bottom to the finished floor at the top, or from the ground to the deck surface. Enter it with the riser height you are aiming for and the tread depth.",[316,317,318,325,331,337,343,349],"ol",{},[319,320,321,324],"li",{},[311,322,323],{},"Risers:"," total rise ÷ target riser, rounded to a whole number. If that puts each riser over the IRC maximum of 7 ¾ inches, the calculator adds one.",[319,326,327,330],{},[311,328,329],{},"Riser height:"," total rise ÷ risers. Every riser in a flight must be the same height to within 3\u002F8 inch.",[319,332,333,336],{},[311,334,335],{},"Treads:"," risers − 1, because the top step is the upper floor.",[319,338,339,342],{},[311,340,341],{},"Total run:"," treads × tread depth.",[319,344,345,348],{},[311,346,347],{},"Stringer length:"," √(total rise² + total run²), the diagonal the stringer covers.",[319,350,351,354],{},[311,352,353],{},"Angle:"," the arctangent of riser ÷ tread.",[307,356,357,358,361],{},"The calculator also shows ",[311,359,360],{},"2 × riser + tread",", an old carpenters' rule of thumb: stairs where it adds up to 24 to 25 inches feel natural to climb.",[302,363,365],{"id":364},"stair-chart-risers-run-and-stringers","Stair chart: risers, run and stringers",[307,367,368],{},"With a 7 ½-inch target riser and 10 ½-inch treads. Stringer stock leaves about a foot for the end cuts.",[370,371,372,400],"table",{},[373,374,375],"thead",{},[376,377,378,382,385,388,391,394,397],"tr",{},[379,380,381],"th",{},"Total rise",[379,383,384],{},"Risers",[379,386,387],{},"Riser height",[379,389,390],{},"Treads",[379,392,393],{},"Total run",[379,395,396],{},"Stringer length",[379,398,399],{},"Stringer board",[401,402,403,427,447,466,487,508,529,550,572,595,616,635,657],"tbody",{},[376,404,405,409,412,415,418,421,424],{},[406,407,408],"td",{},"18 in (1 ft 6 in)",[406,410,411],{},"3",[406,413,414],{},"6 in",[406,416,417],{},"2",[406,419,420],{},"1 ft 9 in",[406,422,423],{},"2 ft 3 11\u002F16 in",[406,425,426],{},"8 ft",[376,428,429,432,435,437,439,442,445],{},[406,430,431],{},"24 in (2 ft)",[406,433,434],{},"4",[406,436,414],{},[406,438,411],{},[406,440,441],{},"2 ft 7 ½ in",[406,443,444],{},"3 ft 3 ⅝ in",[406,446,426],{},[376,448,449,452,454,457,459,461,464],{},[406,450,451],{},"30 in (2 ft 6 in)",[406,453,434],{},[406,455,456],{},"7 ½ in",[406,458,411],{},[406,460,441],{},[406,462,463],{},"3 ft 7 ½ in",[406,465,426],{},[376,467,468,471,474,477,479,482,485],{},[406,469,470],{},"36 in (3 ft)",[406,472,473],{},"5",[406,475,476],{},"7 3\u002F16 in",[406,478,434],{},[406,480,481],{},"3 ft 6 in",[406,483,484],{},"4 ft 7 5\u002F16 in",[406,486,426],{},[376,488,489,492,495,498,500,503,506],{},[406,490,491],{},"42 in (3 ft 6 in)",[406,493,494],{},"6",[406,496,497],{},"7 in",[406,499,473],{},[406,501,502],{},"4 ft 4 ½ in",[406,504,505],{},"5 ft 7 ¼ in",[406,507,426],{},[376,509,510,513,516,519,521,524,527],{},[406,511,512],{},"48 in (4 ft)",[406,514,515],{},"7",[406,517,518],{},"6 ⅞ in",[406,520,494],{},[406,522,523],{},"5 ft 3 in",[406,525,526],{},"6 ft 7 3\u002F16 in",[406,528,426],{},[376,530,531,534,537,539,541,544,547],{},[406,532,533],{},"60 in (5 ft)",[406,535,536],{},"8",[406,538,456],{},[406,540,515],{},[406,542,543],{},"6 ft 1 ½ in",[406,545,546],{},"7 ft 10 ⅞ in",[406,548,549],{},"10 ft",[376,551,552,555,558,560,563,566,569],{},[406,553,554],{},"72 in (6 ft)",[406,556,557],{},"10",[406,559,476],{},[406,561,562],{},"9",[406,564,565],{},"7 ft 10 ½ in",[406,567,568],{},"9 ft 10 13\u002F16 in",[406,570,571],{},"12 ft",[376,573,574,577,580,583,586,589,592],{},[406,575,576],{},"96 in (8 ft)",[406,578,579],{},"13",[406,581,582],{},"7 ⅜ in",[406,584,585],{},"12",[406,587,588],{},"10 ft 6 in",[406,590,591],{},"13 ft 2 ⅜ in",[406,593,594],{},"16 ft",[376,596,597,600,603,606,608,611,614],{},[406,598,599],{},"102 in (8 ft 6 in)",[406,601,602],{},"14",[406,604,605],{},"7 5\u002F16 in",[406,607,579],{},[406,609,610],{},"11 ft 4 ½ in",[406,612,613],{},"14 ft 2 ⅜ in",[406,615,594],{},[376,617,618,621,623,626,628,630,633],{},[406,619,620],{},"108 in (9 ft)",[406,622,602],{},[406,624,625],{},"7 11\u002F16 in",[406,627,579],{},[406,629,610],{},[406,631,632],{},"14 ft 6 1\u002F16 in",[406,634,594],{},[376,636,637,640,643,646,648,651,654],{},[406,638,639],{},"114 in (9 ft 6 in)",[406,641,642],{},"15",[406,644,645],{},"7 ⅝ in",[406,647,602],{},[406,649,650],{},"12 ft 3 in",[406,652,653],{},"15 ft 6 in",[406,655,656],{},"18 ft",[376,658,659,662,665,667,669,672,675],{},[406,660,661],{},"120 in (10 ft)",[406,663,664],{},"16",[406,666,456],{},[406,668,642],{},[406,670,671],{},"13 ft 1 ½ in",[406,673,674],{},"16 ft 6 in",[406,676,656],{},[678,679,681],"h3",{"id":680},"irc-stair-rules-for-houses","IRC stair rules for houses",[370,683,684,694],{},[373,685,686],{},[376,687,688,691],{},[379,689,690],{},"Rule",[379,692,693],{},"Limit (IRC R311.7)",[401,695,696,703,711,719,727,735,743],{},[376,697,698,700],{},[406,699,387],{},[406,701,702],{},"7 ¾ in maximum",[376,704,705,708],{},[406,706,707],{},"Tread depth",[406,709,710],{},"10 in minimum, nosing to nosing",[376,712,713,716],{},[406,714,715],{},"Variation within a flight",[406,717,718],{},"3\u002F8 in maximum between the tallest and shortest riser, or the deepest and shallowest tread",[376,720,721,724],{},[406,722,723],{},"Nosing",[406,725,726],{},"¾ to 1 ¼ in, needed when treads are under 11 in deep",[376,728,729,732],{},[406,730,731],{},"Stair width",[406,733,734],{},"36 in minimum",[376,736,737,740],{},[406,738,739],{},"Headroom",[406,741,742],{},"6 ft 8 in minimum",[376,744,745,748],{},[406,746,747],{},"Handrail",[406,749,750],{},"34 to 38 in above the nosings, on flights with 4 or more risers",[302,752,754],{"id":753},"example-steps-down-from-a-deck-40-inches-high","Example: steps down from a deck 40 ½ inches high",[307,756,757],{},"You want deck stairs with comfortable 11 ¼-inch treads, the width of two 2×6 boards.",[316,759,760,765,770,775,780,786],{},[319,761,762,764],{},[311,763,323],{}," 40.5 ÷ 7.5 = 5.4, which rounds to 5. But 40.5 ÷ 5 = 8.1 inches is over the 7 ¾-inch limit, so use 6 risers.",[319,766,767,769],{},[311,768,329],{}," 40.5 ÷ 6 = 6 ¾ inches.",[319,771,772,774],{},[311,773,335],{}," 6 − 1 = 5.",[319,776,777,779],{},[311,778,341],{}," 5 × 11.25 = 56 ¼ inches, or 4 ft 8 ¼ in. Plan a landing pad that far out from the deck, plus room to step off.",[319,781,782,785],{},[311,783,784],{},"Stringer:"," √(40.5² + 56.25²) = 69.3 inches, about 5 ft 9 5\u002F16 in. An 8-foot 2×12 is enough for each stringer.",[319,787,788,791],{},[311,789,790],{},"Check:"," 2 × 6.75 + 11.25 = 24.75 inches, right in the comfortable range, at an angle of 31°.",[302,793,795],{"id":794},"tips","Tips",[797,798,799,805,811,817,823],"ul",{},[319,800,801,804],{},[311,802,803],{},"Measure the rise at the stairs, not at the house."," Ground slopes. Lay a level board out from the deck to where the bottom step lands and measure down from it.",[319,806,807,810],{},[311,808,809],{},"Use finished floor heights."," If the bottom or top floor is getting tile or hardwood, include it, or the first or last step will be off.",[319,812,813,816],{},[311,814,815],{},"Drop the stringer by one tread thickness."," After cutting, trim the bottom of the stringer by the thickness of one tread so the first step is not taller than the rest.",[319,818,819,822],{},[311,820,821],{},"Lay out with stair gauges."," Clamp brass stair gauges to a framing square at the riser and tread marks and trace each notch.",[319,824,825,828],{},[311,826,827],{},"Leave at least 5 inches of wood below the notches."," On a 2×12 stringer that keeps it strong; for long flights add a middle stringer and support.",{"title":830,"searchDepth":61,"depth":61,"links":831},"",[832,833,836,837],{"id":304,"depth":61,"text":305},{"id":364,"depth":61,"text":365,"children":834},[835],{"id":680,"depth":82,"text":681},{"id":753,"depth":61,"text":754},{"id":794,"depth":61,"text":795},"StairCalculator","Work out how many steps your stairs need, the exact riser height, total run, stringer length and angle from the total rise, with IRC code checks.","md",[842,845,848,851,854,857],{"q":843,"a":844},"How do I calculate the number of stairs I need?","Divide the total rise, floor to floor, by the riser height you want and round to a whole number; that is the number of risers. If the result puts each riser over 7 ¾ inches, add one. A 108-inch rise at a 7 ½-inch target is 14.4, so 14 risers of 7 11\u002F16 inches. There is one fewer tread than risers.",{"q":846,"a":847},"What is the code for stair riser height and tread depth?","The International Residential Code, which most US towns adopt for houses, allows risers up to 7 ¾ inches and needs treads at least 10 inches deep, nosing to nosing. Risers in one flight may not differ by more than 3\u002F8 inch, and stairs need at least 6 feet 8 inches of headroom and 36 inches of width. Check your local code, which can be stricter.",{"q":849,"a":850},"How long does a stair stringer need to be?","The stringer runs along the diagonal, the square root of total rise² + total run². Stairs with a 30-inch rise and three 10-inch treads have a diagonal of about 42 ½ inches. Buy a board at least a foot longer for the top and bottom cuts; for most deck stairs an 8- or 10-foot 2×12 is enough.",{"q":852,"a":853},"How many steps do I need for a 3-foot deck?","A 36-inch rise takes 5 risers of 7 3\u002F16 inches and 4 treads. With 10 ½-inch treads the stairs run 42 inches out from the deck, and each stringer is about 4 feet 7 inches along the diagonal.",{"q":855,"a":856},"What is a comfortable stair angle?","Between about 30 and 37 degrees. Most house stairs land around 35 to 37 degrees with 7 ½-inch risers and 10-inch treads. Shallower stairs with 6- to 7-inch risers and 11- to 12-inch treads are easier for children and older people, but take more floor space.",{"q":858,"a":859},"Why is there one fewer tread than risers?","The top of the stairs is the upper floor or the deck itself, so the last riser steps you straight onto it. A flight with 14 risers has 13 treads. That is also why total run is the number of treads, not risers, times the tread depth.","stair calculator",{},true,[864,865,866,867],"deck-board-calculator","board-foot-calculator","how-to-read-a-tape-measure","fraction-to-decimal-chart",{"title":52,"description":839},"Stair Calculator – Risers, Treads & Stringer Length","2026-10-20","8AQl23-i9ZeVZi7ybSvXkRCvItisuYdVqwKJrRNSpE0",1792531287759]