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 toco toucan compared with a Reading Museum geta sandal?

Use the Reading Museum geta sandal as your reference.

01 / 05
Reading Museum geta sandal, reference object for length comparison
Toco toucan, estimated length relative to the Reading Museum geta sandal
Reading Museum geta sandalReference
Toco toucanYour estimate
Fine tune
All past challenges
View answers and sources

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

  1. Round 1

    How long is a toco toucan compared with a Reading Museum geta sandal?

    Reading Museum geta sandal, used for the length comparison
    ReferenceReading Museum geta sandal21 cm long
    Toco toucan, used for the length comparison
    Compared objectToco toucan63.5 cm long (large adult)

    Illustrations shown individually, not to a shared scale.

    Actual size ratio

    ≈ 3.024×

    Toco toucan ÷ Reading Museum geta sandal, comparing length.

    Saint Louis Zoo lists Toco toucan at about 63.5 cm. This comparison uses the upper size listed, measured from bill tip to tail tip with the bird stretched horizontally.

    Measurement source · stlzoo.org

  2. Round 2

    How long is a soccer ball compared with a Lifesystems Trek first aid kit?

    Lifesystems Trek first aid kit, used for the length comparison
    ReferenceLifesystems Trek first aid kit14 cm long
    Soccer ball, used for the length comparison
    Compared objectSoccer ball22 cm diameter (representative)

    Illustrations shown individually, not to a shared scale.

    Actual size ratio

    ≈ 1.571×

    Soccer ball ÷ Lifesystems Trek first aid kit, comparing length.

    The Laws of the Game require a circumference of 68–70 cm. This round uses a 22 cm diameter, a circumference of 69 cm inside that range.

    Measurement source · theifab.com

  3. Round 3

    How tall is a Polsinelli wine bag-in-box (3L) compared with a SCHÄFER Party-KEG (10L)?

    SCHÄFER Party-KEG (10L), used for the height comparison
    ReferenceSCHÄFER Party-KEG (10L)32.7 cm tall
    Polsinelli wine bag-in-box (3L), used for the height comparison
    Compared objectPolsinelli wine bag-in-box (3L)22.6 cm tall

    Illustrations shown individually, not to a shared scale.

    Actual size ratio

    ≈ 0.6911×

    Polsinelli wine bag-in-box (3L) ÷ SCHÄFER Party-KEG (10L), comparing height.

    For Polsinelli wine bag-in-box (3L), the published measurement is 22.6 cm: the erected three-litre cardboard dispenser's overall height; the tap projects only sideways.

    Measurement source · polsinelli.it

  4. Round 4

    How tall is an IKEA BINTJE plant pot compared with an IKEA DRÖNJÖNS pen cup?

    IKEA DRÖNJÖNS pen cup, used for the height comparison
    ReferenceIKEA DRÖNJÖNS pen cup11 cm tall
    IKEA BINTJE plant pot, used for the height comparison
    Compared objectIKEA BINTJE plant pot10 cm tall

    Illustrations shown individually, not to a shared scale.

    Actual size ratio

    ≈ 0.9091×

    IKEA BINTJE plant pot ÷ IKEA DRÖNJÖNS pen cup, comparing height.

    For IKEA BINTJE plant pot, IKEA specifies 10 cm: overall height of the empty pot for a 9 cm nursery pot, with no plant.

    Measurement source · ikea.com

  5. Round 5

    How long is an African lion compared with a beluga whale?

    Beluga whale, used for the length comparison
    ReferenceBeluga whale4.88 m long (large adult)
    African lion, used for the length comparison
    Compared objectAfrican lion3.3 m long (large male)

    Illustrations shown individually, not to a shared scale.

    Actual size ratio

    ≈ 0.6767×

    African lion ÷ Beluga whale, comparing length.

    SANBI gives male African lions a total length up to 3.3 metres, including the tail. This comparison uses that upper value.

    Measurement source · sanbi.org
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