Compare
The navy silhouette is your fixed reference, labelled with its real size. Check which axis the round measures — height, length or wingspan — before you touch anything.
Size It Up · The daily size guessing game
How big is a grizzly bear?
SCORE/ 500
STREAK🔥 0
Adult Horse2.4 m · across
Adult Horse
1.1 m
0 mm2 m4 m6 m8 m
SLIDE ANYWHERE TO RESIZE · THEN LOCK INGrizzly Bear · adjust the width
PERSONAL BEST 0ROUND 1 / 5
THE DAILY SIZE GUESSING GAME
Why Size It Up is harder than it looks, really.
You have seen a thousand photographs of a blue whale, but you have never stood beside one. That gap is the whole game. The brain files away silhouettes without a scale attached: it knows what a giraffe looks like, what the Eiffel Tower looks like, what a Boeing 747 looks like, but it stores each one at whatever size fit the picture. The Size It Up game puts two of those memories on the same baseline and asks a question your eyes have never had to answer.
The misses are surprisingly systematic. People compress anything much larger than a room — skyscrapers, ships, planets — because they have only ever seen them from far away. They inflate small, well-loved things like insects, phones and food because they see them close up. And they trust map projections, so Greenland reads as a continent and Japan as a footnote. Every daily puzzle is built to catch one of those habits, which is why a single round can swing from an incredible eye to a scale shock.
None of this needs arithmetic. The reference object is drawn at true scale and both silhouettes share one calibrated ruler, so the only skill you are training is proportion. Play for a week and you will notice the change in the real world: the bus looks a little longer, the moon a little smaller, and the numbers on the reveal stop being surprises.
HOW TO PLAY SIZE IT UP
Compare. Resize. Reveal.
Every day brings five comparisons. Each takes about twenty seconds, and the whole puzzle is scored out of 500. Here is the short version; the full rules, scoring and tips have their own page.
Resize
Drag anywhere on the board, pull the diagonal handle, tap the step buttons or use the arrow keys until the coral mystery object looks the right size next to the reference.
Reveal
Lock in to overlay the true outline. Each round scores up to 100 points depending on how close your proportion came, and the reveal links to the source of the measurement.
A WORLD OF SCALE
156 objects.
12 ways to play.
The calibrated library mixes familiar American icons with animals, NASA hardware, geography, dinosaurs, technology, music, world landmarks and everyday objects. The Size It Up game draws its daily puzzle from all of them, and each category also has its own unlimited practice set.
Animals
From bullfrogs and house cats to giraffes and blue whales.
Play Animals →Vehicles
Bikes, buses, aircraft, ships and engineering icons.
Play Vehicles →Landmarks
World-famous structures measured at true scale.
Play Landmarks →Space
Rockets, spacecraft and worlds that bend intuition.
Play Space →Sports
Balls, equipment, goals, pools and playing fields.
Play Sports →Everyday
Objects you see constantly but rarely measure.
Play Everyday →Food & Drink
A surprisingly difficult edible line-up.
Play Food & Drink →Geography
Countries, states and islands compared by span.
Play Geography →Dinosaurs
Prehistoric giants, hunters and flying reptiles.
Play Dinosaurs →Technology
Phones, consoles, servers and modern machines.
Play Technology →Music
Instruments from pocket-sized to concert-hall huge.
Play Music →Insects & Bugs
Tiny bodies, enormous wings and record breakers.
Play Insects & Bugs →SCALE SHOCKS
Sizes that surprise almost everyone.
Three comparisons from the Size It Up game library that reliably fool first-time players, and why.
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. Play the landmarks set →
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. Play the space set →
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. Play the space set →
COMMON QUESTIONS
Good questions. Surprisingly large answers.
What is Size It Up?
Size It Up is a free daily size guessing game. Each round shows a familiar reference silhouette at true scale next to a mystery object. You resize the mystery object until the proportion looks right, lock in, and see how close your guess came to the real measurement. Five rounds make one puzzle, scored out of 500.
How often does Size It Up update?
The Size It Up game adds a new daily puzzle every day at midnight in your local time zone. Everyone who plays on the same date gets the same five comparisons, which is what makes the daily leaderboard fair. Between puzzles, Unlimited mode generates fresh practice sets on demand.
Is the daily puzzle the same for everyone?
Yes. The daily puzzle is generated from the calendar date, so every player receives the same five comparisons in the same order. Scores, times and finish order decide the daily ranking.
Can I play past puzzles?
Yes. The Past games archive lets you replay any daily puzzle from the last 60 days, and every date also has an answers page listing each object's measured size with its source. Replaying an archived day never changes your streak. Browse the archive or jump straight to a date's answers.
Can I play in feet and inches?
Yes. Switch between metric and US customary units at any time from the Options panel. Your guess is stored as a proportion, so changing units never alters your answer.
Where do the measurements come from?
Every object in the game links to a published measurement — usually Wikipedia, a manufacturer specification or an official record. Interface silhouettes use Font Awesome Free under CC BY 4.0 alongside original calibrated vectors, and each one is cropped to its true outline so what you see on the board is what the number says.