SizeGame

Play the Size Guess

Loading the item library…

Size It Up: A Free Size Comparison Game

Guessing a size is easy. Being right is not. Size It Up is a free size comparison game by SizeGame, playable right in the browser and built on 225 objects: 73 animals, 84 everyday things, 40 vehicles and 28 landmarks. Each round hands you one object drawn at its true scale and a second object you resize until the pair looks right. Lock it in, and the real measurement appears next to your guess. Daily, endless and timed modes, no account needed.

Play Free
1024×768 · /images/landpage/home/home-hero.webpGrey silhouette of a giraffe labelled GIRAFFE HEIGHT 5.5 m standing beside an orange double-decker bus labelled only DOUBLE-DECKER BUS, drawn at true relative height on a shared ground line

What a Size Comparison Game Asks You to Do

You Resize. You Do Not Type a Number.

Typing "27 metres" is a memory test. Placing one shape next to another and making the pair look right is a judgement test, and it is far harder. That is the whole point of the format: it checks how well your eye understands scale, not how many facts you happen to remember.

1024×768 · /images/landpage/home/home-resize.webpOrange office chair with a circular resize handle at its corner and an empty height measurement line beside it, labelled OFFICE CHAIR, with the hint DRAG TO RESIZE

Every Round Ends With the Real Measurement

You never have to take our word for it. Once you lock in, the true size is drawn against your guess and the gap between the two is shown as a number. Being twice too big and being half too small cost you the same, so the game never rewards a lucky direction. A round takes well under a minute.

1024×768 · /images/landpage/home/home-reveal.webpGrey Leaning Tower of Pisa labelled HEIGHT 56 m beside an orange street lamp that carries a dashed true-size outline and a measurement labelled TRUE 8 m

Three Modes, One Mechanic

The daily mode gives everyone the same set each day, so a score means something when you put it next to a friend's. The endless mode drops the daily cap and lets you keep going as long as you like. The timed mode adds a countdown and asks how many you can get right before it runs out.

1024×768 · /images/landpage/home/home-three-modes.webpThree labelled silhouettes in a row at increasing scale: a grey cat for DAILY 5 ROUNDS, an orange car for ENDLESS and an orange lighthouse for TIMED 60 SEC

How a Size Guessing Game Round Runs

Step 01

Read the Reference

One object is already at its true size and never moves. Treat it as your ruler for the rest of the round.

Step 02

Resize the Second Object

Drag its corner handles until the pair looks right to your eye. Zoom in if either shape is too small to judge.

Step 03

Lock In and See the Truth

Your guess is scored against the real measurement, and you are told which way you were wrong.

Why Play This Size Comparison Game

Free, With No Account

Every mode is free and runs in the browser. There is no sign-up wall before your first round and no download to sit through.

Playable on a Phone

Dragging and pinching are the natural way to resize a shape, and that is exactly how the controls work on a touchscreen.

Three Ways to Play

A shared daily puzzle, an endless practice mode and a countdown mode. The mechanic stays the same, the pressure changes. The category tabs let you stay on one collection when you want to.

Errors Are Shown, Not Hidden

You see the gap between guess and reality as a number every single round. That feedback is what turns a few minutes of guessing into anchors you keep.

Size Comparison Game FAQ

Size It Up is a free size comparison game about real-world scale. Each round gives you one object at its true size and one object you resize until the pair looks right, then shows the real measurement against your guess. It runs on 225 objects across four collections, with a daily set, an endless mode and a timed mode.

A quiz asks you to recall a number. This game asks you to look at two shapes and decide their ratio, which is how you judge size in everyday life. You can be excellent at trivia and still be off by a factor of ten here, because recall and visual judgement are different skills.

Yes, every mode is free in the browser. There is no paid tier, no locked mode and nothing to install before your first round.

No. You open the page and play. There is no email step, no password and no profile to fill in, which also means there is nothing to recover if you switch devices.

Scoring is proportional to how far your guess is from the true size, measured as a ratio rather than in pixels. The closer you land, the higher the score, and being equally far off in either direction costs you the same. Exact thresholds depend on the mode you are playing.

Yes. The game is built around dragging and pinching, so touch is the primary input rather than an afterthought. A single round fits comfortably into a short break on a small screen.

The daily mode gives everyone the same set with no clock, so it rewards care. The timed mode adds a countdown, so it rewards speed and forces you to commit before you have fully convinced yourself. To practise one subject at a time, the category tabs narrow the pool to animals, vehicles, landmarks or everyday things.

225 in total: 73 animals, 84 everyday things, 40 vehicles and 28 landmarks. Everyday things are the largest group because they are the ones you can actually picture next to yourself, from a mug to a door frame. Landmarks are the smallest group and the hardest, since most of them are too big to have ever stood beside.

Play the Size Comparison Game Free

Three modes, no account, nothing to install. Pick a mode and find out how good your eye really is.
Start Guessing