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The size comparison game that plays by eye

A size comparison game asks one deceptively simple question: how big is this, compared with that? Size It Up answers it with a calibrated board — a reference silhouette drawn at true scale, a mystery object you resize with a drag, and a reveal that overlays the real outline and scores your proportion. Five rounds a day, 156 measured objects, 12 categories.

Play the daily puzzle → Practice unlimited

What makes a good size comparison game

Most size comparison content is a video or a chart: things line up from small to large and you watch. That is entertaining, but it does not test anything. A game needs a guess, a reveal and a score, and it needs the reveal to be trustworthy. Size It Up is built around three rules that keep it honest:

Everything shares one baseline and one scale. The reference and the mystery object stand on the same line and use the same calibrated ruler, so proportion is the only variable.
Every silhouette is cropped to its true outline. The drawing box is exactly the measured height or length, with no padding, so what you see is what the number says.
Every size has a source. The reveal links to the published measurement — Wikipedia, a manufacturer spec or an official record — for every one of the 156 objects.

Comparisons that catch almost everyone

3.5×

Eiffel Tower vs. Statue of Liberty

The Statue of Liberty feels enormous because you have always seen it from a boat. Measured from ground to torch it stands 93 m; the Eiffel Tower reaches 330 m. Put them on the same baseline and Liberty barely clears the tower's first platform — a reminder that famous does not mean tall. Try the landmarks set →

1.2×

Saturn V vs. Statue of Liberty

The Moon rocket is the reverse trap. People know it was big, so they guess skyscraper-big. At 111 m the Saturn V is only about 1.2 times the height of the Statue of Liberty including its pedestal. It is a very tall object, but it is a building, not a district. Try the space set →

11×

Jupiter vs. Earth

Diagrams of the solar system shrink the planets to fit on a page, so most players size Jupiter at three or four Earths across. The true figure is eleven Earth diameters, roughly 140,000 km. Nothing in daily life prepares your eyes for that jump, which is exactly why the reveal is satisfying. Try the space set →

How the game is scored

Each round scores 0–100 on the ratio between your guess and the real size, symmetrically, so double and half are equally wrong. Five rounds make 500. The daily puzzle is identical for everyone on that date and ranks players by score, then time; practice sets are unlimited and unranked. The how-to-play page has the full breakdown and five tips.

Play by category

Prefer a theme? Every category has its own endless practice set:

Animals — From bullfrogs and house cats to giraffes and blue whales.
Vehicles — Bikes, buses, aircraft, ships and engineering icons.
Landmarks — World-famous structures measured at true scale.
Space — Rockets, spacecraft and worlds that bend intuition.
Sports — Balls, equipment, goals, pools and playing fields.
Everyday — Objects you see constantly but rarely measure.
Food & Drink — A surprisingly difficult edible line-up.
Geography — Countries, states and islands compared by span.
Dinosaurs — Prehistoric giants, hunters and flying reptiles.
Technology — Phones, consoles, servers and modern machines.
Music — Instruments from pocket-sized to concert-hall huge.
Insects & Bugs — Tiny bodies, enormous wings and record breakers.

Play on any device

Size It Up runs in the browser on phones, tablets and desktops with no download or account. On a phone the board fills the first screen with a tab bar for the leaderboard and options; on a laptop the whole puzzle fits above the fold. It is also installable as a web app for offline practice.