Resize one familiar thing against another. Five rounds, one shared challenge, and a surprising sense of scale.
5daily rounds
100points each
2 minaverage play
Today’s challengeRound 1 of 5
0 / 500
How large is the target compared with the reference?
Match the real-world measurement, not the drawing.
The fixed reference is on the left and the resizable target is on the right. Use the scale control or arrow keys, then lock in your estimate.
Excellent eye — 90/100
Your estimate was close to the true comparison.
Scale note
Each result reveals one useful anchor for your next estimate.
Daily complete
0/500
Five guesses made. The result bars show where your visual intuition was sharpest.
0day streak
0personal best
00:00next daily
↑↓ resizeEnter lock or continueF fullscreen
No waiting required
Train your sense of scale.
The daily puzzle is shared by everyone. Practice mode keeps going, with fresh comparisons from the category you choose.
A useful kind of wrong
Numbers fade. Comparisons stick.
Most of us do not carry exact measurements around in memory. We remember relationships: a blue whale feels like several buses, the Moon feels like a smaller Earth, and one tower feels roughly half of another. Size It Up turns those fuzzy anchors into something visible.
The score uses proportional error, so guessing twice too large is treated like guessing half too small. That makes a centimetre-scale round and a planet-scale round fair to compare.
Each round compares one stated measurement: height, length, diameter, or span.
02
Set the proportion
Drag the target, move the scale control, or use the arrow keys until the relationship feels right.
03
Keep the anchor
Lock the estimate to reveal the true outline, score, dimensions, and one memorable fact.
Common questions
Before you size it up.
Is Size It Up free to play?
Yes. The daily game and unlimited practice are free in a modern browser, with no account or download required.
Does everyone get the same daily rounds?
Yes. The five-round set is generated from the UTC date, so players around the world can compare the same challenge. A new set appears at 00:00 UTC.
What does the outline after a guess mean?
The filled target preserves your estimate. The dashed outline shows the true proportional size along the round’s named measurement axis.
Are the object measurements exact?
Natural objects vary, and some landmarks can be measured in several ways. Each round names the axis, uses a representative or published dimension, and links its reference on the sources page.
Is this the official Magnitudle game?
No. Size It Up Daily is an independent visual estimation game with its own code, challenge library, interface, scoring, and practice modes. It is not endorsed by or affiliated with Magnitudle.