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
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All past challenges

How long is a Staedtler 148 40 carpenter pencil compared with an Osprey Daylite Waist pack (2L)?

Use the Osprey Daylite Waist pack (2L) as your reference.

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Osprey Daylite Waist pack (2L), reference object for length comparison
Staedtler 148 40 carpenter pencil, estimated length relative to the Osprey Daylite Waist pack (2L)
Osprey Daylite Waist pack (2L)Reference
Staedtler 148 40 carpenter pencilYour 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 a Staedtler 148 40 carpenter pencil compared with an Osprey Daylite Waist pack (2L)?

    Osprey Daylite Waist pack (2L), used for the length comparison
    ReferenceOsprey Daylite Waist pack (2L)45 cm wide
    Staedtler 148 40 carpenter pencil, used for the length comparison
    Compared objectStaedtler 148 40 carpenter pencil17.5 cm long

    Illustrations shown individually, not to a shared scale.

    Actual size ratio

    ≈ 0.3889×

    Staedtler 148 40 carpenter pencil ÷ Osprey Daylite Waist pack (2L), comparing length.

    For Staedtler 148 40 carpenter pencil, Staedtler specifies 175 mm: full length before sharpening; both ends are square-cut.

    Measurement source · staedtler.com

  2. Round 2

    How long is a Lifesystems Safety Whistle compared with a Legrand Valena Next wireless switch?

    Legrand Valena Next wireless switch, used for the length comparison
    ReferenceLegrand Valena Next wireless switch8.3 cm wide
    Lifesystems Safety Whistle, used for the length comparison
    Compared objectLifesystems Safety Whistle7.2 cm long

    Illustrations shown individually, not to a shared scale.

    Actual size ratio

    ≈ 0.8675×

    Lifesystems Safety Whistle ÷ Legrand Valena Next wireless switch, comparing length.

    Manufacturer specification for Lifesystems Safety Whistle: 72 mm; overall whistle-body length, excluding neck lanyard.

    Measurement source · lifesystems.co.uk

  3. Round 3

    How long is a T-38 Talon compared with a B-2 Spirit?

    B-2 Spirit, used for the length comparison
    ReferenceB-2 Spirit20.9 m long
    T-38 Talon, used for the length comparison
    Compared objectT-38 Talon14 m long

    Illustrations shown individually, not to a shared scale.

    Actual size ratio

    ≈ 0.6699×

    T-38 Talon ÷ B-2 Spirit, comparing length.

    The published specification gives T-38 Talon an overall length of 14 metres. This comparison measures the whole aircraft from its foremost nose point to its rearmost tail point.

    Measurement source · af.mil

  4. Round 4

    How long is a GARDENA 3517-20 weed puller compared with a galápagos giant tortoise?

    Galápagos giant tortoise, used for the length comparison
    ReferenceGalápagos giant tortoise1.83 m long (large male)
    GARDENA 3517-20 weed puller, used for the length comparison
    Compared objectGARDENA 3517-20 weed puller108.8 cm long

    Illustrations shown individually, not to a shared scale.

    Actual size ratio

    ≈ 0.5945×

    GARDENA 3517-20 weed puller ÷ Galápagos giant tortoise, comparing length.

    For GARDENA 3517-20 weed puller, GARDENA specifies 108.8 cm: overall end-to-end length, with the long tool shown horizontally.

    Measurement source · gardena.com

  5. Round 5

    How tall is an IKEA DEKAD alarm clock compared with an IKEA KORKEN bottle?

    IKEA KORKEN bottle, used for the height comparison
    ReferenceIKEA KORKEN bottle29 cm tall
    IKEA DEKAD alarm clock, used for the height comparison
    Compared objectIKEA DEKAD alarm clock14 cm tall

    Illustrations shown individually, not to a shared scale.

    Actual size ratio

    ≈ 0.4828×

    IKEA DEKAD alarm clock ÷ IKEA KORKEN bottle, comparing height.

    For IKEA DEKAD alarm clock, IKEA specifies 14 cm: overall upright height, including the feet and top handle.

    Measurement source · ikea.com
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