Same measurement
A giant manta ray's disc width and a blue whale's body length are both impressive, but they do not answer the same question. Use the dimension shown on each silhouette.
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Size Comparison Game
Size It Up is a free size comparison game about proportion, not memorising numbers. Pick a reference, resize the target until it looks right, then reveal the real measurement.
- Fresh real-world pairs
- No account needed
- Reveal the measured answer
Play an unlimited size comparison game
Every round draws a fresh, compatible pair from the library. There is no daily cap in Unlimited mode.
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Make the comparison fair before you guess
A convincing outline can still give the wrong answer if you compare different dimensions. Treat the label as part of the object: height with height, length with length, and width with width. That keeps the game about visual proportion instead of a misleading number.
Start with a ratio
Ask how many times the reference would fit into the target. A rough ratio is easier to adjust than a number remembered in isolation.
Use familiar anchors
A person, doorway, car or landmark can give your eye a useful baseline. Then let the measurement reveal whether that first impression held up.
Three ways scale can surprise you
Use the library when you want to stay with one topic after a round. These routes organise comparable real-world items without repeating the daily-game experience on the homepage.
Landmark heights
Stonehenge · Big Ben · Statue of Liberty · Eiffel Tower
From a 7.8 m stone to a 330 m tower, familiar landmarks are often harder to place than their outlines suggest.
Compare landmark sizes →Animal scale
Giant manta ray · Whale shark · Blue whale
A manta ray's width is a different measurement from a whale's length. The game labels the dimension so the comparison stays honest.
Browse animal comparisons →Everyday height
Person · Saguaro cactus · Refrigerator
A known object gives your eye a starting point. Estimate a ratio first, then adjust the silhouette.
Explore familiar objects →Use the game, then check the context
- 01Read the fixed reference and the dimension named on its label.
- 02Resize the target around a rough ratio, rather than chasing an exact remembered number.
- 03Lock in, read the real measurement and error, then open a topic route if you want to compare more examples.