Sizedle

The daily size guessing game

Sizedle. How big is it, really?

Five silhouettes a day. Resize each one until it looks right beside something you know, then lock in. Same five rounds for everyone, new ones at midnight.

—
Daily · round 1/5
Reference Target
smaller bigger

Your eye versus the tape measure

Sizedle deals five comparisons a day. On the left is a reference you already know — a person, a bus, a tennis court, the Eiffel Tower. On the right is today’s target at whatever size you say it is. Drag, scroll or slide until it looks right, lock in, and find out how good your mental ruler really is.

181 real objects, 21 references

The pool runs from a flea to the Danyang–Kunshan Grand Bridge. Every object has its own page with its size in metric and imperial and a to-scale comparison — browse them all in the size comparison chart, or read how the sizes are chosen.

Animals From fleas to blue whales — how big are animals, really? 38 objects Dinosaurs T. rex, Brachiosaurus and friends next to things you know. 8 objects Landmarks Towers, statues and skyscrapers to scale. 29 objects Nature Mountains, waterfalls and the tallest trees on Earth. 16 objects Vehicles Cars, planes, ships and trains side by side. 30 objects Space Rockets, space stations, asteroids and moons. 18 objects Everyday things The things around you — harder to judge than you think. 19 objects Food Blueberries to baguettes. 8 objects Sports Balls, courts, pitches and race distances. 15 objects

Frequently asked questions

What is Sizedle?

Sizedle is a free daily size guessing game. Each day you get five real-world objects — animals, landmarks, vehicles, spacecraft and everyday things. For each one you resize a silhouette next to something whose size you already know, then lock in and see the true size drawn over your guess.

Is everyone playing the same five rounds?

Yes. The daily set is picked with the calendar date as the seed, so everyone playing on the same date gets the same five objects and references. A new set starts at midnight where you are.

How is each round scored?

Your slider sets an implied size. Within 6% of the real size scores 100; twice as big and half as big count as the same miss. Five rounds make a maximum of 500. The full table is on the how to play page.

Can I play more than one set a day?

Yes. Unlimited mode deals fresh sets of 5, 10 or 20 rounds, filtered by category if you like, and the archive has every past daily set. Neither affects your streak.

Can I challenge a friend?

Finish an unlimited set and press “Challenge a friend”. The link contains the set’s seed, so your friend plays exactly the same rounds.

Is Sizedle like Size It Up?

It’s the same kind of game — visual size estimation against a reference — made independently, with its own objects, scoring and modes. See games like Size It Up for a comparison.

Do I need an account?

No. Your streak and scores stay in this browser’s local storage and never leave your device.