size it up.

A little perspective

Trust your eye.

Five comparisons. Two objects each time. How close can you get?

  1. Compare

    The object on the left is your measuring stick. Keep resizing — the view automatically zooms out when you need more room. You can also zoom the canvas; both objects scale together without changing your estimate.

  2. Find the right size

    Drag the blue handle, scroll while hovering it, tap − / +, or use the arrow keys. Match the dimension in the question.

  3. Lock it in

    Reveal the real size and earn up to 100 points. Five rounds add up to a maximum of 500.

The first answer in each round counts. A new challenge arrives every day at 00:00 UTC. Object sizes use the specific examples shown in the answer.

Read the full rules and scoring guide
Practice · not ranked
All past challenges

How tall is a Drive Air-Cane walking cane compared with a bowling pin?

Use the bowling pin as your reference.

01 / 05
Bowling pin, reference object for height comparison
Drive Air-Cane walking cane, estimated height relative to the bowling pin
Bowling pinReference
Drive Air-Cane walking caneYour estimate
Fine tune
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View answers and sources

Answers from this past challenge. Today’s challenge remains a surprise.

  1. Round 1

    How tall is a Drive Air-Cane walking cane compared with a bowling pin?

    Bowling pin, used for the height comparison
    ReferenceBowling pin38.1 cm tall (standard target)
    Drive Air-Cane walking cane, used for the height comparison
    Compared objectDrive Air-Cane walking cane93.98 cm tall

    Illustrations shown individually, not to a shared scale.

    Actual size ratio

    ≈ 2.467×

    Drive Air-Cane walking cane ÷ Bowling pin, comparing height.

    For Drive Air-Cane walking cane, Drive Medical specifies 93.98 cm: overall height of the fully unfolded cane at its maximum setting; converted from 37 inches.

    Measurement source · drivemedical.com

  2. Round 2

    How long is a Beastmaker 1000 hangboard compared with a size 3 handball?

    Size 3 handball, used for the length comparison
    ReferenceSize 3 handball18.78 cm across (representative)
    Beastmaker 1000 hangboard, used for the length comparison
    Compared objectBeastmaker 1000 hangboard58 cm wide

    Illustrations shown individually, not to a shared scale.

    Actual size ratio

    ≈ 3.088×

    Beastmaker 1000 hangboard ÷ Size 3 handball, comparing length.

    Manufacturer specification for Beastmaker 1000 hangboard: 580 mm; full horizontal width of the wooden hangboard.

    Measurement source · beastmaker.co.uk

  3. Round 3

    How long is a cheetah compared with a badminton racket?

    Badminton racket, used for the length comparison
    ReferenceBadminton racket68 cm long (maximum)
    Cheetah, used for the length comparison
    Compared objectCheetah2.29 m long (large adult)

    Illustrations shown individually, not to a shared scale.

    Actual size ratio

    ≈ 3.362×

    Cheetah ÷ Badminton racket, comparing length.

    Cheetah Conservation Fund gives cheetahs a total length up to 7.5 feet, about 2.29 metres. This includes the long tail.

    Measurement source · cheetah.org

  4. Round 4

    How long is a Pteranodon compared with a tennis court?

    Tennis court, used for the length comparison
    ReferenceTennis court23.77 m long
    Pteranodon, used for the length comparison
    Compared objectPteranodon7 m wide (approximate)

    Illustrations shown individually, not to a shared scale.

    Actual size ratio

    ≈ 0.2945×

    Pteranodon ÷ Tennis court, comparing length.

    For Pteranodon, Witton and Habib, PLOS ONE records 7 m wide (approximate): Research reconstruction of wingspan, one wingtip to the other with wings fully extended in dorsal view; not body length.

    Measurement source · pmc.ncbi.nlm.nih.gov

  5. Round 5

    How long is a BRK PR710B smoke alarm compared with a vinyl record?

    Vinyl record, used for the length comparison
    ReferenceVinyl record30.48 cm across (nominal)
    BRK PR710B smoke alarm, used for the length comparison
    Compared objectBRK PR710B smoke alarm13.208 cm diameter

    Illustrations shown individually, not to a shared scale.

    Actual size ratio

    ≈ 0.4333×

    BRK PR710B smoke alarm ÷ Vinyl record, comparing length.

    Manufacturer specification for BRK PR710B smoke alarm: 132.08 mm; outside diameter of the round PR710B alarm, viewed face-on.

    Measurement source · customer.resideo.com
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