[{"data":1,"prerenderedAt":768},["ShallowReactive",2],{"catalog":3,"page:\u002Fpets\u002Fdog-age-calculator":224},[4,37,58,91,112,143,170,197],{"path":5,"stem":6,"title":7,"short":8,"icon":9,"order":10,"calculators":11},"\u002Fwoodworking","woodworking\u002Findex","Woodworking Calculators","Board feet, deck boards, tape measure fractions and inch decimals.","i-lucide-hammer",1,[12,19,25,31],{"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,"order":43,"calculators":44},"\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,[45,52],{"path":46,"stem":47,"title":48,"short":49,"icon":50,"hub":51},"\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":53,"stem":54,"title":55,"short":56,"icon":57,"hub":51},"\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":59,"stem":60,"title":61,"short":62,"icon":63,"order":64,"calculators":65},"\u002Fquilting","quilting\u002Findex","Quilting Calculators","Backing, binding, half-square triangles and quilt sizes.","i-lucide-grid-3x3",3,[66,73,79,85],{"path":67,"stem":68,"title":69,"short":70,"icon":71,"hub":72},"\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":74,"stem":75,"title":76,"short":77,"icon":78,"hub":72},"\u002Fquilting\u002Fquilt-backing-calculator","quilting\u002Fquilt-backing-calculator","Quilt Backing Calculator","Yardage, panels and seam direction for any quilt back.","i-lucide-layers",{"path":80,"stem":81,"title":82,"short":83,"icon":84,"hub":72},"\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":86,"stem":87,"title":88,"short":89,"icon":90,"hub":72},"\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":92,"stem":93,"title":94,"short":95,"icon":96,"order":97,"calculators":98},"\u002Fsewing-and-needlework","sewing-and-needlework\u002Findex","Sewing & Needlework Calculators","Fabric yardage, cutting plans and cross stitch fabric sizes.","i-lucide-scissors",4,[99,106],{"path":100,"stem":101,"title":102,"short":103,"icon":104,"hub":105},"\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":107,"stem":108,"title":109,"short":110,"icon":111,"hub":105},"\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":113,"stem":114,"title":115,"short":116,"icon":117,"order":118,"calculators":119},"\u002Fknitting-and-crochet","knitting-and-crochet\u002Findex","Knitting & Crochet Calculators","Yarn yardage, gauge and cast-on counts, and blanket sizes.","i-lucide-spool",5,[120,126,132,137],{"path":121,"stem":122,"title":123,"short":124,"icon":90,"hub":125},"\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":127,"stem":128,"title":129,"short":130,"icon":131,"hub":125},"\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":133,"stem":134,"title":135,"short":136,"icon":111,"hub":125},"\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":138,"stem":139,"title":140,"short":141,"icon":142,"hub":125},"\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":144,"stem":145,"title":146,"short":147,"icon":148,"order":149,"calculators":150},"\u002Fpool-and-aquarium","pool-and-aquarium\u002Findex","Pool & Aquarium Calculators","Pool gallons, aquarium volume and fish stocking.","i-lucide-waves",6,[151,158,164],{"path":152,"stem":153,"title":154,"short":155,"icon":156,"hub":157},"\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":159,"stem":160,"title":161,"short":162,"icon":163,"hub":157},"\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":165,"stem":166,"title":167,"short":168,"icon":169,"hub":157},"\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":171,"stem":172,"title":173,"short":174,"icon":175,"order":176,"calculators":177},"\u002Fgarden","garden\u002Findex","Garden Calculators","Companion plants, raised bed soil and square foot garden plans.","i-lucide-leaf",7,[178,185,191],{"path":179,"stem":180,"title":181,"short":182,"icon":183,"hub":184},"\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":186,"stem":187,"title":188,"short":189,"icon":190,"hub":184},"\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":192,"stem":193,"title":194,"short":195,"icon":196,"hub":184},"\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":198,"stem":199,"title":200,"short":201,"icon":202,"order":203,"calculators":204},"\u002Fpets","pets\u002Findex","Pet & Backyard Animal Calculators","Cat and dog ages in human years, and chicken coop space.","i-lucide-paw-print",8,[205,212,218],{"path":206,"stem":207,"title":208,"short":209,"icon":210,"hub":211},"\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":213,"stem":214,"title":215,"short":216,"icon":217,"hub":211},"\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":219,"stem":220,"title":221,"short":222,"icon":223,"hub":211},"\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",{"kind":225,"calculator":226},"calculator",{"id":227,"title":221,"body":228,"calculator":738,"description":739,"extension":740,"faq":741,"hub":211,"icon":223,"keyword":757,"meta":758,"navigation":759,"path":219,"related":760,"seo":764,"seoTitle":765,"short":222,"stem":220,"updated":766,"__hash__":767},"calculators\u002Fpets\u002Fdog-age-calculator.md",{"type":229,"value":230,"toc":730},"minimark",[231,236,240,247,314,317,323,329,332,336,339,343,346,660,663,667,670,697,700,704],[232,233,235],"h2",{"id":234},"how-the-calculator-works","How the calculator works",[237,238,239],"p",{},"The calculator shows two methods side by side, because they answer the question differently.",[237,241,242,246],{},[243,244,245],"strong",{},"1. The size chart."," Veterinary sources commonly publish a chart in which every dog counts 15 human years at its first birthday and 24 at its second, after which bigger dogs age faster. The calculator turns that chart into one simple rule per size, based on adult weight:",[248,249,250,266],"table",{},[251,252,253],"thead",{},[254,255,256,260,263],"tr",{},[257,258,259],"th",{},"Size",[257,261,262],{},"Adult weight",[257,264,265],{},"Each year after two adds",[267,268,269,281,292,303],"tbody",{},[254,270,271,275,278],{},[272,273,274],"td",{},"Small",[272,276,277],{},"20 lb or less (up to 9 kg)",[272,279,280],{},"4 human years",[254,282,283,286,289],{},[272,284,285],{},"Medium",[272,287,288],{},"21–50 lb (10–23 kg)",[272,290,291],{},"4.5 human years",[254,293,294,297,300],{},[272,295,296],{},"Large",[272,298,299],{},"51–90 lb (23–41 kg)",[272,301,302],{},"5.5 human years",[254,304,305,308,311],{},[272,306,307],{},"Giant",[272,309,310],{},"over 90 lb (over 41 kg)",[272,312,313],{},"7 human years",[237,315,316],{},"Under a year it scales in a straight line from 0 to 15, so a 6-month-old puppy comes out at about 7.5. Puppies develop in spurts, so treat puppy numbers loosely.",[237,318,319,322],{},[243,320,321],{},"2. The epigenetic formula."," Researchers at UC San Diego led by Tina Wang compared age-related changes in DNA methylation, chemical marks on DNA that shift as we age, in Labrador retrievers and in people. Their study, shared as a preprint in 2019 and published in Cell Systems in 2020, proposed:",[237,324,325,328],{},[243,326,327],{},"human age = 16 × ln(dog age) + 31",", where ln is the natural logarithm.",[237,330,331],{},"It says dogs age very quickly at first and slowly later: a 1-year-old Lab works out to 31, a 10-year-old to about 68. Keep two limits in mind. It was derived from Labradors only, so it has not been shown to fit other breeds or sizes. And it is not meant for young puppies; for the youngest it even gives negative ages. The calculator shows it only for dogs a year and older.",[232,333,335],{"id":334},"why-not-just-multiply-by-seven","Why not just multiply by seven?",[237,337,338],{},"Nobody is quite sure where the seven-to-one rule came from; it may simply compare rough human and dog lifespans. It fails at both ends. A 1-year-old dog is nearly adult, not a 7-year-old child, and the rule ignores size: by 16, a small dog is about 80 on the size chart, while a giant-breed dog, if it got that far, would be about 122.",[232,340,342],{"id":341},"dog-age-chart-by-size","Dog age chart by size",[237,344,345],{},"Human ages are rounded to the nearest year.",[248,347,348,366],{},[251,349,350],{},[254,351,352,355,357,359,361,363],{},[257,353,354],{},"Dog's age",[257,356,274],{},[257,358,285],{},[257,360,296],{},[257,362,307],{},[257,364,365],{},"Epigenetic (Labrador)",[267,367,368,385,402,421,441,460,479,498,517,535,552,571,589,607,625,643],{},[254,369,370,373,376,378,380,382],{},[272,371,372],{},"1",[272,374,375],{},"15",[272,377,375],{},[272,379,375],{},[272,381,375],{},[272,383,384],{},"31",[254,386,387,390,393,395,397,399],{},[272,388,389],{},"2",[272,391,392],{},"24",[272,394,392],{},[272,396,392],{},[272,398,392],{},[272,400,401],{},"42",[254,403,404,407,410,413,416,418],{},[272,405,406],{},"3",[272,408,409],{},"28",[272,411,412],{},"29",[272,414,415],{},"30",[272,417,384],{},[272,419,420],{},"49",[254,422,423,426,429,432,435,438],{},[272,424,425],{},"4",[272,427,428],{},"32",[272,430,431],{},"33",[272,433,434],{},"35",[272,436,437],{},"38",[272,439,440],{},"53",[254,442,443,446,449,451,454,457],{},[272,444,445],{},"5",[272,447,448],{},"36",[272,450,437],{},[272,452,453],{},"41",[272,455,456],{},"45",[272,458,459],{},"57",[254,461,462,465,468,470,473,476],{},[272,463,464],{},"6",[272,466,467],{},"40",[272,469,401],{},[272,471,472],{},"46",[272,474,475],{},"52",[272,477,478],{},"60",[254,480,481,484,487,490,492,495],{},[272,482,483],{},"7",[272,485,486],{},"44",[272,488,489],{},"47",[272,491,475],{},[272,493,494],{},"59",[272,496,497],{},"62",[254,499,500,503,506,509,511,514],{},[272,501,502],{},"8",[272,504,505],{},"48",[272,507,508],{},"51",[272,510,459],{},[272,512,513],{},"66",[272,515,516],{},"64",[254,518,519,522,524,527,530,533],{},[272,520,521],{},"9",[272,523,475],{},[272,525,526],{},"56",[272,528,529],{},"63",[272,531,532],{},"73",[272,534,513],{},[254,536,537,540,542,544,547,550],{},[272,538,539],{},"10",[272,541,526],{},[272,543,478],{},[272,545,546],{},"68",[272,548,549],{},"80",[272,551,546],{},[254,553,554,557,559,562,565,568],{},[272,555,556],{},"11",[272,558,478],{},[272,560,561],{},"65",[272,563,564],{},"74",[272,566,567],{},"87",[272,569,570],{},"69",[254,572,573,576,578,580,583,586],{},[272,574,575],{},"12",[272,577,516],{},[272,579,570],{},[272,581,582],{},"79",[272,584,585],{},"94",[272,587,588],{},"71",[254,590,591,594,596,598,601,604],{},[272,592,593],{},"13",[272,595,546],{},[272,597,564],{},[272,599,600],{},"85",[272,602,603],{},"101",[272,605,606],{},"72",[254,608,609,612,614,617,620,623],{},[272,610,611],{},"14",[272,613,606],{},[272,615,616],{},"78",[272,618,619],{},"90",[272,621,622],{},"108",[272,624,532],{},[254,626,627,629,632,635,638,641],{},[272,628,375],{},[272,630,631],{},"76",[272,633,634],{},"83",[272,636,637],{},"96",[272,639,640],{},"115",[272,642,564],{},[254,644,645,648,650,652,654,657],{},[272,646,647],{},"16",[272,649,549],{},[272,651,567],{},[272,653,603],{},[272,655,656],{},"122",[272,658,659],{},"75",[237,661,662],{},"The giant column past about 10 years is mostly theoretical, since few giant breeds live that long.",[232,664,666],{"id":665},"example-a-7-year-old-labrador","Example: a 7-year-old Labrador",[237,668,669],{},"A 7-year-old Lab that weighs 65 lb is a large dog.",[671,672,673,683,691],"ul",{},[674,675,676,679,680,682],"li",{},[243,677,678],{},"Size chart:"," 24 + 5 years × 5.5 = 51.5, so about ",[243,681,475],{},".",[674,684,685,688,689,682],{},[243,686,687],{},"Epigenetic formula:"," 16 × ln(7) + 31 = 16 × 1.946 + 31 = 62.1, so about ",[243,690,497],{},[674,692,693,696],{},[243,694,695],{},"Times seven:"," 49.",[237,698,699],{},"The two methods are ten years apart for the very breed the formula was built on. That is a good reminder that \"dog years\" describe a stage of life, not a measurement.",[232,701,703],{"id":702},"tips","Tips",[671,705,706,712,718,724],{},[674,707,708,711],{},[243,709,710],{},"Go by adult weight."," For a puppy or a mixed breed, use the weight your dog is expected to reach as an adult.",[674,713,714,717],{},[243,715,716],{},"Don't use dog years for doses or food."," Medication and feeding amounts depend on weight and your veterinarian's advice, not on a human-age equivalent.",[674,719,720,723],{},[243,721,722],{},"Aging varies."," Breed, genes, weight and health all play a part, and two dogs of the same age and size can age very differently.",[674,725,726,729],{},[243,727,728],{},"Watch for changes."," Stiffness, weight change, drinking more or new behavior is worth a vet visit at any age.",{"title":731,"searchDepth":43,"depth":43,"links":732},"",[733,734,735,736,737],{"id":234,"depth":43,"text":235},{"id":334,"depth":43,"text":335},{"id":341,"depth":43,"text":342},{"id":665,"depth":43,"text":666},{"id":702,"depth":43,"text":703},"DogAgeCalculator","Convert dog years to human years two ways, side by side, the size-based vet chart and the epigenetic formula from a study of Labrador retrievers.","md",[742,745,748,751,754],{"q":743,"a":744},"How do I calculate my dog's age in human years?","Count 15 human years for the first year and 9 more for the second, so every 2-year-old dog is about 24. After that, add about 4 a year for small dogs, 4.5 for medium, 5.5 for large and 7 for giant breeds. A 7-year-old medium dog is about 47.",{"q":746,"a":747},"Is one dog year really seven human years?","No. A 1-year-old dog is nearly grown and can have puppies, so it is closer to a teenager than a 7-year-old child. After the first two years, small dogs age more slowly than seven a year and giant breeds about that fast or faster.",{"q":749,"a":750},"Why do big dogs age faster than small dogs?","Large and giant breeds tend to have shorter lives and reach their senior years sooner, so each year counts for more of their lifespan. Researchers are still working out exactly why size and lifespan are linked this way.",{"q":752,"a":753},"What is the 16 ln(age) + 31 formula?","It comes from a UC San Diego study of Labrador retrievers by Wang and colleagues, published in Cell Systems in 2020, that compared age-related DNA methylation in dogs and people. Take the natural log of the dog's age in years, multiply by 16 and add 31. It was built from one breed and is not meant for young puppies.",{"q":755,"a":756},"When is a dog considered a senior?","It depends on size. The 2019 AAHA Canine Life Stage Guidelines define the senior stage as the last quarter of a dog's expected lifespan, so a giant breed reaches it years earlier than a small one. Your veterinarian can tell you when that is for your dog.","dog age calculator",{},true,[761,762,763],"cat-age-calculator","chicken-coop-size-calculator","fish-tank-stocking-calculator",{"title":221,"description":739},"Dog Age Calculator – Dog Years to Human Years by Size","2026-10-17","kHkDnxLK7BNqH0D7GvttdtDDrDEgEZGaBH_4hQQujfk",1792193316689]