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 long is an IKEA LURVIG litter scoop compared with a Coco de mer seed?

Use the Coco de mer seed as your reference.

01 / 05
Coco de mer seed, reference object for length comparison
IKEA LURVIG litter scoop, estimated length relative to the Coco de mer seed
Coco de mer seedReference
IKEA LURVIG litter scoopYour estimate
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View answers and sources

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

  1. Round 1

    How long is an IKEA LURVIG litter scoop compared with a Coco de mer seed?

    Coco de mer seed, used for the length comparison
    ReferenceCoco de mer seed50 cm long (maximum)
    IKEA LURVIG litter scoop, used for the length comparison
    Compared objectIKEA LURVIG litter scoop25 cm long

    Illustrations shown individually, not to a shared scale.

    Actual size ratio

    ≈ 0.5×

    IKEA LURVIG litter scoop ÷ Coco de mer seed, comparing length.

    For IKEA LURVIG litter scoop, the published measurement is 25 cm: the full scoop from its front edge to the end of its handle.

    Measurement source · ikea.com.tr

  2. Round 2

    How long is a rugby ball compared with a Hohner Special 20 harmonica?

    Hohner Special 20 harmonica, used for the length comparison
    ReferenceHohner Special 20 harmonica10.2 cm long
    Rugby ball, used for the length comparison
    Compared objectRugby ball30 cm long (maximum)

    Illustrations shown individually, not to a shared scale.

    Actual size ratio

    ≈ 2.941×

    Rugby ball ÷ Hohner Special 20 harmonica, comparing length.

    World Rugby permits a rugby union ball to be 280 to 300 millimetres long. This comparison uses the maximum length of 30 centimetres from tip to tip, not either of the ball’s circumferences.

    Measurement source · passport.world.rugby

  3. Round 3

    How tall is a Shard compared with a Taipei 101?

    Taipei 101, used for the height comparison
    ReferenceTaipei 101508 m tall
    The Shard, used for the height comparison
    Compared objectThe Shard309.6 m tall

    Illustrations shown individually, not to a shared scale.

    Actual size ratio

    ≈ 0.6094×

    The Shard ÷ Taipei 101, comparing height.

    The published specification gives The Shard an overall height of 309.6 metres. This comparison measures the full structure from ground level to its highest tip, including the spire or antenna.

    Measurement source · the-shard.com

  4. Round 4

    How tall is a Kidde Basic 110 fire extinguisher compared with a Lewis chess king?

    Lewis chess king, used for the height comparison
    ReferenceLewis chess king9.5 cm tall
    Kidde Basic 110 fire extinguisher, used for the height comparison
    Compared objectKidde Basic 110 fire extinguisher36.068 cm tall

    Illustrations shown individually, not to a shared scale.

    Actual size ratio

    ≈ 3.797×

    Kidde Basic 110 fire extinguisher ÷ Lewis chess king, comparing height.

    Manufacturer specification for Kidde Basic 110 fire extinguisher: 360.68 mm; overall upright height of FA110G including handle, without bracket.

    Measurement source · brand.kidde.com

  5. Round 5

    How tall is a Crown standard beverage can (330ml) compared with a Nalgene 32 oz Wide Mouth bottle?

    Nalgene 32 oz Wide Mouth bottle, used for the height comparison
    ReferenceNalgene 32 oz Wide Mouth bottle21 cm tall (nominal)
    Crown standard beverage can (330ml), used for the height comparison
    Compared objectCrown standard beverage can (330ml)11.52 cm tall

    Illustrations shown individually, not to a shared scale.

    Actual size ratio

    ≈ 0.5486×

    Crown standard beverage can (330ml) ÷ Nalgene 32 oz Wide Mouth bottle, comparing height.

    For Crown standard beverage can (330ml), the published measurement is 11.52 cm: the full outside height of the standard 330 ml can body, without added packaging.

    Measurement source · crowncork.com
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