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 soccer goal compared with a school bus?

Use the school bus as your reference.

01 / 05
School bus, reference object for length comparison
Soccer goal, estimated length relative to the school bus
School busReference
Soccer goalInside posts
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 soccer goal compared with a school bus?

    School bus, used for the length comparison
    ReferenceSchool bus12 m long
    Soccer goal, used for the length comparison
    Compared objectSoccer goal7.32 m wide

    Illustrations shown individually, not to a shared scale.

    Actual size ratio

    ≈ 0.61×

    Soccer goal ÷ School bus, comparing length.

    The Laws of the Game set the distance between the inside of the posts at 7.32 metres. This silhouette spans that width.

    Measurement source · theifab.com

  2. Round 2

    How long is a blue whale compared with an Airbus A380?

    Airbus A380, used for the length comparison
    ReferenceAirbus A38073 m long
    Blue whale, used for the length comparison
    Compared objectBlue whale33.5 m long (maximum)

    Illustrations shown individually, not to a shared scale.

    Actual size ratio

    ≈ 0.4589×

    Blue whale ÷ Airbus A380, comparing length.

    Antarctic blue whales can reach about 110 feet (33.5 metres). This round uses that maximum length, not the average.

    Measurement source · fisheries.noaa.gov

  3. Round 3

    How long is a T. rex compared with a white shark?

    White shark, used for the length comparison
    ReferenceWhite shark6.1 m long (maximum)
    T. rex, used for the length comparison
    Compared objectT. rex12 m long

    Illustrations shown individually, not to a shared scale.

    Actual size ratio

    ≈ 1.967×

    T. rex ÷ White shark, comparing length.

    A typical adult T. rex was about 12 metres long. Fossil specimens vary in size.

    Measurement source · nhm.ac.uk

  4. Round 4

    How long is a table tennis table compared with an American alligator?

    American alligator, used for the length comparison
    ReferenceAmerican alligator3.4 m long (average adult male)
    Table tennis table, used for the length comparison
    Compared objectTable tennis table2.74 m long

    Illustrations shown individually, not to a shared scale.

    Actual size ratio

    ≈ 0.8059×

    Table tennis table ÷ American alligator, comparing length.

    The playing surface of a table tennis table is 2.74 metres long and 1.525 metres wide. The vertical sides of the top are not part of that surface.

    Measurement source · documents.ittf.sport

  5. Round 5

    How tall is a male ostrich compared with an adult?

    Adult, used for the height comparison
    ReferenceAdult1.7 m tall (representative)
    Male ostrich, used for the height comparison
    Compared objectMale ostrich2.7 m tall (large male)

    Illustrations shown individually, not to a shared scale.

    Actual size ratio

    ≈ 1.588×

    Male ostrich ÷ Adult, comparing height.

    Male ostriches can stand up to about 2.7 metres tall. This round uses that upper height, measured from the feet to the top of the head.

    Measurement source · animals.sandiegozoo.org
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