HeightCalculator.run

What is this website?

HeightCalculator.run places known heights on one ground line and one scale, so you can see how large a numerical gap looks when people stand side by side. The homepage holds up to 12 custom people, and you can also add celebrities, characters, animals, landmarks, or schematic objects. Figures rotate, results include centimetres, feet and inches, and a relative percentage, and you can download a PNG or copy an editable link. Public tools calculate in the browser and do not require an account. Models scale only to the height you enter; they are not portraits of real people.

Core features

• The homepage comparison uses the first entry as the baseline. You can change the baseline, colour, zoom, or full screen, and rotate figures from the front, side, or back. Besides centimetres and feet and inches, the page also explains the gap as stacked fists.
• The height-difference page compares two people only, with an input range of 0.1–300 cm. It shows a signed difference, an absolute gap, a ratio, and a percentage that uses the second person as the denominator.
• The converter switches among centimetres, metres, feet and inches, total inches, and decimal feet, using 2.54 cm per inch. It treats 5.9 feet and 5 feet 9 inches as different notations.
• Photo height estimation needs a full-body photo with a measured reference and calculates from original-image pixel proportions. JPG, PNG, and WebP open locally, up to 20 MB and 60 megapixels, and the photo is not uploaded.
• Growth tools stay separate. Parent heights use (father + mother ± 13 cm) ÷ 2 as a family reference, not a personal adult-height prediction. Ages 2–20 can be compared with CDC height and weight references, length from birth to 24 months with WHO, and growth velocity can be calculated between two measurements.
• The adult page shows a screening weight interval for BMI 18.5–24.9 and lists the Devine, Robinson, Miller, and Hamwi historical formulas side by side; those four are omitted below 152.4 cm. The dunk page uses measured standing reach and rim height to calculate the jump required, with a default rim of 304.8 cm, and it does not infer arm length from height.

Common use cases

• Couples, friends, or family members who want to see a side-by-side lineup before meeting or taking a photo replace template names and heights with their own, and keep shoes, posture, and measurement time as consistent as they can.
• When arranging characters or checking a fan comparison, you can add a character from the library (the page example includes Goku) or a celebrity (the template example is Taylor Swift). Before publishing, check the original work or source, because heights change by edition and citation.
• When explaining how large an animal, landmark, or everyday object is, place the schematic object next to a person on the same chart. The site states that these are not engineering measurements.
• For a fixed image in a post or lesson, download a light, dark, or transparent PNG. If the other person still needs to change the numbers, send a link or QR code instead; the link contains the names and heights you entered.
• For unit conversion, a two-person gap, a photo estimate from a measured reference such as a doorway, or a lookup of a family reference, percentiles, a country-cohort mean, an adult weight interval, or a dunk jump, open the matching calculator directly.

Who is it for?

• People who already have height numbers and want to see several of them on one scale, including couple height gaps and comparisons with library figures.
• People who want a formula they can check: unit conversion, two-person difference, photo proportion, mid-parental height, and CDC and WHO references are written on each tool page.
• People making character sheets, scale explanations, or presentation images, as long as they treat the figures as schematic and verify library heights themselves.
• It is a poor fit for someone who wants one calculation to predict a child’s adult height, to treat a result as a medical diagnosis, or to read touching the rim as proof they can dunk. Those outputs are labeled as educational references.
• If the browser has no WebGL or hardware acceleration is off, the 3D figures may not render, and the numerical calculators are the usable path.

How does it compare with similar tools?

The site does not rank itself against other products. Choose among its own pages by the question: use the homepage for several people side by side and rotatable figures; use the height-difference page when you only need the centimetre gap, ratio, and percentage for two people. If the unit notation is unclear, convert first, and keep decimal feet separate from feet plus inches. A photo estimate is unreliable without a measured reference, or when the person and the reference are not at the same depth. The family formula, CDC/WHO percentiles, and country means for an 18-year-old cohort (born in 1996, measured in 2014) answer different reference questions, and none replaces an individual prediction. The dunk calculation uses standing reach, not height to the top of the head.

FAQ

Q: Does HeightCalculator.run require an account or a payment?
A: The public 3D comparison, PNG download, sharing, and calculators are free and do not require an account. A comparison is normally saved in the current browser and disappears when site data is cleared; keep a share link to continue on another device. The site says advertising may be added later, and the tools are not charged for because of that.

Q: How accurate are the 3D figures and library heights?
A: Every entry shares one height scale. Conversion uses 1 inch = 2.54 cm, and displayed values are rounded. Figures are stylized models; hairstyle, body shape, and shoulder or eye position are not real-person proportions. Celebrity heights vary by source, and character heights vary by edition, so check the original reference before citing them.

Q: What is in a share link?
A: The link contains the names and heights for that comparison. Anyone with it can view them and edit their own copy. Use a PNG when you want to send a fixed image. Photo height estimation runs locally in the browser and does not upload the picture into a public gallery.

Q: Can it predict adult height or tell whether someone can dunk?
A: No. The height calculator gives a family reference from the parents’ heights and can place a current height on the CDC reference. The page states that it has no validated individual prediction interval. The dunk page only calculates the jump needed for a fingertip to reach the rim or a clearance you set; reaching that height is not the same as controlling the ball for a dunk.