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 a pair of FELCO 2 pruning shears compared with an IKEA TROMMA wall clock?

Use the IKEA TROMMA wall clock as your reference.

01 / 05
IKEA TROMMA wall clock, reference object for length comparison
FELCO 2 pruning shears, estimated length relative to the IKEA TROMMA wall clock
IKEA TROMMA wall clockReference
FELCO 2 pruning shearsYour 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 long is a pair of FELCO 2 pruning shears compared with an IKEA TROMMA wall clock?

    IKEA TROMMA wall clock, used for the length comparison
    ReferenceIKEA TROMMA wall clock25 cm diameter
    FELCO 2 pruning shears, used for the length comparison
    Compared objectFELCO 2 pruning shears21.49 cm long

    Illustrations shown individually, not to a shared scale.

    Actual size ratio

    ≈ 0.8595×

    FELCO 2 pruning shears ÷ IKEA TROMMA wall clock, comparing length.

    For FELCO 2 pruning shears, FELCO specifies 21.4884 cm: nominal overall closed-tool length; converted from 8.46 inches.

    Measurement source · america.felco.com

  2. Round 2

    How long is an Isotelus rex fossil compared with a scarlet macaw?

    Scarlet macaw, used for the length comparison
    ReferenceScarlet macaw89 cm long (large adult)
    Isotelus rex fossil, used for the length comparison
    Compared objectIsotelus rex fossil72 cm long (approximate)

    Illustrations shown individually, not to a shared scale.

    Actual size ratio

    ≈ 0.809×

    Isotelus rex fossil ÷ Scarlet macaw, comparing length.

    For Isotelus rex fossil, American Museum of Natural History records 72 cm long (approximate): Preserved dorsal exoskeleton length of the giant trilobite, front of head shield to rear of tail shield; surrounding rock excluded.

    Measurement source · digitalcollections.amnh.org

  3. Round 3

    How long is a Cat 797F mining truck compared with a basketball court?

    Basketball court, used for the length comparison
    ReferenceBasketball court28 m long
    Cat 797F mining truck, used for the length comparison
    Compared objectCat 797F mining truck15.08 m long

    Illustrations shown individually, not to a shared scale.

    Actual size ratio

    ≈ 0.5386×

    Cat 797F mining truck ÷ Basketball court, comparing length.

    The published specification gives Cat 797F mining truck an overall length of 15.08 metres. This comparison measures the whole truck with its dump body lowered, rather than just the load bed.

    Measurement source · cat.com

  4. Round 4

    How tall is a Yongzhong bell compared with a Rosetta Stone?

    Rosetta Stone, used for the height comparison
    ReferenceRosetta Stone112.3 cm tall
    Yongzhong bell, used for the height comparison
    Compared objectYongzhong bell61 cm tall

    Illustrations shown individually, not to a shared scale.

    Actual size ratio

    ≈ 0.5432×

    Yongzhong bell ÷ Rosetta Stone, comparing height.

    For Yongzhong bell, The Metropolitan Museum of Art records 61 cm tall: Complete Eastern Zhou bronze bell from lower mouth edge to upper handle tip; excludes stand and beater.

    Measurement source · metmuseum.org

  5. Round 5

    How long is a STABILA Type 70 spirit level compared with an iPad mini (A17 Pro)?

    iPad mini (A17 Pro), used for the length comparison
    ReferenceiPad mini (A17 Pro)19.54 cm long
    STABILA Type 70 spirit level, used for the length comparison
    Compared objectSTABILA Type 70 spirit level60 cm long

    Illustrations shown individually, not to a shared scale.

    Actual size ratio

    ≈ 3.071×

    STABILA Type 70 spirit level ÷ iPad mini (A17 Pro), comparing length.

    STABILA Type 70 spirit level (60 cm) measures 60 cm; this comparison uses the overall end-to-end length of the 60 cm level, including its end caps.

    Measurement source · stabila.com
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