Size Comparison Game
Streamer mode · ExitToday’s five comparisons
Resize real objects. Trust your eye. See how close you get.
Opening your five comparisons…
How to play this size comparison game
Compare real objects on one shared scale. Each question gives you a fixed reference; your task is to guess the size of the other object. Play this size guessing game online for free. The question pool includes animals, everyday objects, vehicles, buildings, and planets.
- Read the measurement.
Check the dimension named in the question and note the fixed reference size.
- Resize the target.
Drag anywhere on the board, pinch, scroll, or use the slider and adjustment buttons until the two objects look right together.
- Reveal and continue.
Lock in your guess. The view frames both objects and the actual size grows into place, with your score and a quick comparison. Open the source or move to the next question.
More ways to play
- AnimalsA new animals set every day, then unlimited rounds.
- Buildings & landmarksA new buildings & landmarks set every day, then unlimited rounds.
- Space & planetsA new space & planets set every day, then unlimited rounds.
- DinosaursA new dinosaurs set every day, then unlimited rounds.
- Vehicles & transportA new vehicles & transport set every day, then unlimited rounds.
- SportsA new sports set every day, then unlimited rounds.
- Everyday objectsA new everyday objects set every day, then unlimited rounds.
Sizes that surprise people
Common questions
What does “size” mean in each question?
The question names the dimension being compared, such as height, length, width, diameter, or wingspan. Read that label before resizing the target. If a source publishes a range, the result shows both boundaries instead of pretending there is one exact size.
Does zooming the canvas change my guess?
No. The zoom buttons and Fit both only change your view, and the game reframes the view by itself when an object leaves it. Dragging on the board, pinching, scrolling, the slider and the adjustment buttons change your estimate.
How is my score calculated?
Each question is worth up to 100 points. We divide the smaller of your estimate and the actual size by the larger, multiply by 100, and round. Guessing half or twice the actual size earns 50 points. A guess inside a published range earns 100; outside it, the nearest boundary is used.
When does the daily challenge change?
Everyone gets the same five comparisons for each numbered daily. From October 5, 2026, a new set begins at midnight in your own time zone; earlier dailies changed at midnight UTC. After finishing, you can play another five-question round in Unlimited or revisit a published date in the Archive. Replaying does not replace your first completed daily score.
Where is my progress saved?
Your current round, daily results, and best practice score stay in this browser when storage is available. There is no account or cross-device sync. If browser storage is blocked or cleared, those records cannot be restored.
Where do the measurements come from?
We built this size comparison game around named measurements and linked sources. After each answer, open View source & measurement to check both objects’ measurements and definitions. The silhouettes help you compare the named dimension; other proportions may be simplified. If you find a problem, tell us which comparison you saw.
Is this Size It Up?
No. Size It Up is Magnitudle’s daily size-estimation game, and its official home is magnitudle.com/size-it-up. Size Comparison Game is a separate, independent game with its own objects, measurement sources and scoring, and it is not affiliated with Magnitudle.