How good is your sense of scale?
Five questions about the real world. Make a guess, see the reveal, and come back tomorrow to beat your score.
Make a guess. Learn the number.
Unitbox Daily turns familiar units into a quick test of intuition. You do not need specialist knowledge; a good estimate and a little reasoning are enough.
- EstimateCommit to your best answer.
- RevealSee the published value and range.
- RememberUse the related converter to explore the unit.
Keep exploring
Turn today’s answer into a useful conversion or read the reasoning behind the number.
Questions about the game
What is Unitbox Daily? Unitbox Daily is a free daily estimation game about real-world size, weight, distance and data. Make your best guess, reveal the answer and earn up to 500 points.
Do I need an account? No. Your streak, personal best and completed rounds are saved in this browser. An account system may be added later for cross-device sync.
How are scores calculated? Scores reward estimates that are close to the answer. Large values use a logarithmic error scale so a tenfold miss is treated consistently across different units.
Where do the answers come from? Every question includes a source and a short explanation. Estimates use published specifications or a clearly stated real-world range.
Can I play yesterday’s challenge? The first version focuses on the daily round. Historical challenges and unlimited practice are planned for the next release.