Everyday objects size comparison library
Sports equipment, standard paper and everyday references make useful mental rulers. Regulated dimensions and explicitly chosen examples keep these comparisons reproducible.
20 objects
50-metre swimming pool
50 mlengthNominal long-course racing length; touch panels and tolerances are governed by the rules.
Everyday objectsA 1.70 m person
1.7 mheightA deliberately chosen 1.70 m reference, not a claim about average human height.
Everyday objectsA4 paper
29.7 cmlengthLong side of an ISO A4 sheet, 210 × 297 mm.
Everyday objectsAn 80-inch door
2.03 mheightChosen 80-inch door leaf; the frame is excluded.
Everyday objectsBadminton court
13.4 mlengthRegulation full court length, excluding surrounding clearance.
Everyday objectsCompact disc
12 cmdiameterOutside diameter of a standard 120 mm compact disc.
Everyday objectsFIBA basketball court
28 mlengthRegulation FIBA playing court length; boundary runoff is excluded.
Everyday objectsFootball goal
7.32 mwidthClear width between the inside edges of the posts.
Everyday objectsGolf ball
4.27 cmdiameterMinimum permitted diameter of 1.680 inches.
Everyday objectsIce hockey puck
7.62 cmdiameterRegulation 3-inch diameter; thickness is not being measured.
Everyday objectsID-1 credit card
8.56 cmlengthNominal long side of the ISO ID-1 format, 85.60 mm.
Everyday objectsiPhone 16
14.8 cmheightDevice height excluding a case, from Apple’s iPhone 16 specifications.
Everyday objectsSize 5 football
22 cmdiameterDerived from a chosen 69 cm circumference within the IFAB 68–70 cm range.
Everyday objectsSize 7 basketball
24.2 cmdiameterDiameter derived from a chosen 760 mm circumference within the FIBA size 7 range: circumference ÷ π.
Everyday objectsTable tennis ball
4 cmdiameterNominal 40 mm diameter specified by the ITTF.
Everyday objectsTable tennis table
2.74 mlengthRegulation length of the playing surface.
Everyday objectsTennis ball
6.7 cmdiameterChosen 67 mm diameter within the ITF Type 2 permitted range.
Everyday objectsTennis court
23.8 mlengthRegulation baseline-to-baseline length; runoff space is excluded.
Everyday objectsVolleyball
21 cmdiameterRounded diameter derived from a chosen 66 cm circumference.
Everyday objectsVolleyball court
18 mlengthRegulation indoor playing court length, excluding free zone.
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