Daily
The same puzzle for everyone, new at local midnight. Share your result when you finish.
- objects
- 5
- max score
- 500
Guess the Size
Stretch animals, vehicles and landmarks next to something familiar. Can you guess the real size?
How to play
Guess the Size is a free size comparison game that runs in your browser, on desktop and mobile.
-
Compare
Look at the reference on the left. Its real size is marked.
-
Stretch
Resize the object on the right. Drag, use the slider or pinch.
-
Lock in
See the real size, how far off you were and your score.
Three ways to play
Unlimited
Random objects every run. Play as long as you like and beat your best score.
- objects per run
- 10
- max score
- 1,000
Duel
You vs Sizebot. The closer guess knocks a heart off the other side. Easy, Normal or Hard (6 s per round).
- hearts each
- 4
- per round
- 12 s
Bigger than you think
Real sizes from the game. The bars are to scale.
Blue whale vs city bus
2.1× longer
- Blue whale 25 m
- City bus 12 m
About as long as two city buses.
Tokyo Tower vs Statue of Liberty
7.2× taller
- Tokyo Tower 333 m
- Statue of Liberty 46 m
Seven statues, heel to torch, still fall short.
Giraffe vs adult person
3.2× taller
- Giraffe 5.5 m
- Adult person 1.7 m
Taller than three adults stacked up.
Scoring
Each object is worth up to 100 points. Too big or too small, it counts the same.
- 100within 6% of the real size
- ≈45half or double the real size
- ≈15× too big or too small
FAQ
Is Guess the Size free?
Yes. It's free to play in your browser, with no sign-up and nothing to download.
Can I play on my phone?
Yes. It works on phones and tablets: drag the slider or pinch with two fingers to resize.
Is this the Roblox game “Guess The Real Size!”?
No. Guess the Size is an independent browser game built around the same idea of stretching objects to their real size. It is not affiliated with Roblox Corporation or the creators of that experience.
How is the score calculated?
Each object is worth up to 100 points. A guess within 6% of the real size scores 100. The further off you are, the fewer points you get: half or double the real size scores about 45, and 5× off scores about 1.
Can I use metric or imperial units?
Both. Switch between m and ft in the game. Browsers set to US English start in feet.
When does the daily puzzle change?
At midnight in your local time zone. Everyone gets the same 5 objects on the same date.
Where do the sizes come from?
From typical values in encyclopedias and official sources such as NASA and the US National Park Service. Real things vary, so the game uses rounded, typical sizes.
Is my progress saved?
Yes, but only in this browser. Your scores, daily results and settings are saved on your device, not on a server, so clearing the site's data resets them.