The measurement collection

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

Everyday objects

50-metre swimming pool

50 mlength

Nominal long-course racing length; touch panels and tolerances are governed by the rules.

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Everyday objects

A 1.70 m person

1.7 mheight

A deliberately chosen 1.70 m reference, not a claim about average human height.

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Everyday objects

A4 paper

29.7 cmlength

Long side of an ISO A4 sheet, 210 × 297 mm.

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Everyday objects

An 80-inch door

2.03 mheight

Chosen 80-inch door leaf; the frame is excluded.

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Everyday objects

Badminton court

13.4 mlength

Regulation full court length, excluding surrounding clearance.

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Everyday objects

Compact disc

12 cmdiameter

Outside diameter of a standard 120 mm compact disc.

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Everyday objects

FIBA basketball court

28 mlength

Regulation FIBA playing court length; boundary runoff is excluded.

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Everyday objects

Football goal

7.32 mwidth

Clear width between the inside edges of the posts.

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Everyday objects

Golf ball

4.27 cmdiameter

Minimum permitted diameter of 1.680 inches.

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Everyday objects

Ice hockey puck

7.62 cmdiameter

Regulation 3-inch diameter; thickness is not being measured.

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Everyday objects

ID-1 credit card

8.56 cmlength

Nominal long side of the ISO ID-1 format, 85.60 mm.

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Everyday objects

iPhone 16

14.8 cmheight

Device height excluding a case, from Apple’s iPhone 16 specifications.

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Everyday objects

Size 5 football

22 cmdiameter

Derived from a chosen 69 cm circumference within the IFAB 68–70 cm range.

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Everyday objects

Size 7 basketball

24.2 cmdiameter

Diameter derived from a chosen 760 mm circumference within the FIBA size 7 range: circumference ÷ π.

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Everyday objects

Table tennis ball

4 cmdiameter

Nominal 40 mm diameter specified by the ITTF.

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Everyday objects

Table tennis table

2.74 mlength

Regulation length of the playing surface.

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Everyday objects

Tennis ball

6.7 cmdiameter

Chosen 67 mm diameter within the ITF Type 2 permitted range.

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Everyday objects

Tennis court

23.8 mlength

Regulation baseline-to-baseline length; runoff space is excluded.

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Everyday objects

Volleyball

21 cmdiameter

Rounded diameter derived from a chosen 66 cm circumference.

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Everyday objects

Volleyball court

18 mlength

Regulation indoor playing court length, excluding free zone.

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