How good is your sense of scale?
Size It Up is a free daily size comparison game: guess the size of everyday objects, planets, dinosaurs, food and tiny things against something you know.
Play to Earn Gamesdle Discounts →Today's puzzles
Classic
Everyday things, from a credit card to the Burj Khalifa. Five a day.
Cosmic Scale
Planets, moons, stars and spacecraft, measured by NASA. Its own daily leaderboard.
Prehistoric Giants
Dinosaurs and extinct giants beside today's animals, sized from museum specimens.
Kitchen Table
Food and kitchenware, from a peppercorn to a kitchen island.
Tiny Worlds
Insects, seeds and cells, from a coin down to a bacterium.
How it works
Read
The teal object is drawn at its real size. Treat it as your ruler.
Stretch
Pull, pinch or tap the arrow keys until the orange one looks right beside it.
Confirm
The true outline lands over your guess, with the real number and its source.
Score
Up to 100 points a round. Land within 6% for a perfect round.
Questions
What is the Size It Up game?
Size It Up is a free daily size comparison game about your sense of scale. Each round draws a familiar teal object at its real size; you stretch an orange shape until it looks right beside it, then confirm to see the true size and where the number comes from.
Which games can I play?
Five, each with its own daily puzzle and leaderboard: Classic (everyday things, from a credit card to the Burj Khalifa), Cosmic Scale (planets, moons, stars and spacecraft), Prehistoric Giants (dinosaurs and extinct animals beside today's), Kitchen Table (food and kitchenware) and Tiny Worlds (insects, seeds and cells, down to a bacterium).
How is each round scored?
Up to 100 points a round, 500 a day. What counts is the ratio between your guess and the truth, so guessing double is as far off as guessing half. Within 6% scores all 100; twice or half the size scores about 33; five times off scores nothing.
Where do the real sizes come from?
Every answer names what is measured and links to its source: ISO standards and sports rulebooks for everyday objects, NASA fact sheets for space, and museum specimens and published papers for extinct animals. Every object is listed with its size and source under How big is it?
When does a new puzzle come out?
A new numbered puzzle for every game at midnight in your timezone. Missed one? The archive replays any past day.
Can I play more than five rounds a day?
Yes. Free play is unlimited guess-the-size: it deals endless rounds from each game's whole collection. Free play and archive replays don't count toward streaks, leaderboards or Insight.
Do I need an account?
No, anyone can play as a guest. Signing in with Google adds the daily leaderboard, your streak on every device, and Insight, a points balance you can spend in the shop on titles and board themes.
Is SizeItUp free?
Yes. There's nothing to buy with money, and nothing changes your score. Questions or a number that looks off? Write to support@sizeitup.us.
