1. Check the reference
The green object gives you a known height, length, diameter or area.
A LITTLE GAME OF PERSPECTIVE
Size It Up — Daily Size Guessing Game
Size It Up is a free size-comparison game. Resize the purple silhouette against the green reference and reveal real measurements across five daily rounds.
Five comparisons · 500 points
Finding a little perspective…
No timer No sign-up Free to play
HOW TO PLAY
Controls & scoring How to play Size It Up
2. Make your estimate
Resize the purple silhouette until the two look right together.
3. Reveal the real size
Lock in your guess. See the answer, your points and the source.
Daily, unlimited or a favorite theme?
Each Classic game has five rounds worth up to 100 points each. Read the measurement after every reveal, then use that reference to make your next estimate. A perfect game earns 500 points.
One shared daily challenge
Everyone gets the same five comparisons for the UTC date. A new challenge arrives at midnight UTC, and your first completed result goes into your Daily record.
Keep practicing
Unlimited size comparisons let you start another five-round game whenever you want. To revisit a particular day, use the daily puzzle archive.
Follow a subject
Choose a topic below, or pick a curated five-question collection to learn a fixed set of reference points. Prefer quick bigger-or-smaller decisions? Try Scale Streak.
FOLLOW YOUR CURIOSITY
All collections Explore Size It Up by topic
COUNTRIES & MAPSGeography
Familiar outlines. Surprising areas. Put countries on one scale.
Compare country areas
PLANETS & PROPORTIONSUniverse
Go beyond the picture in your textbook. See how big planets really are.
Play the planet size game
FICTION, WITH A RULERPop Culture
Compare Star Wars droids and bounty hunters using their listed heights.
Compare character heightsA LITTLE MORE PERSPECTIVE
Explore the guides Some sizes are hard to imagine.
A source behind every size.
Real measurements, clearly labeled examples and a link to the original source after every reveal.
Questions about the daily game
How is my score calculated?
The closer your estimate is to the real measurement, the more points you earn. A guess twice the actual size receives the same points as a guess half its size. See examples in the scoring guide.
Can I play more than once a day?
Yes. Unlimited has no daily play limit. Use the Archive to replay a published daily challenge without changing your first Daily score.
Is this the original Magnitudle game?
This is an independent edition, with its own code, questions and scoring. Find details and a link to the original on our About page.
Does it work on mobile?
Yes. Resize with the slider or plus and minus buttons, then tap Lock in. No app or account is needed. See the mobile controls.