Cosmic You
Type a birthday and watch a whole life tick by β seconds, heartbeats, spins of the Earth, and how far you've flown through space just by existing.
A whole life so far
Type a birthday and watch an entire life add up β every second, spin, and heartbeat since day one.
Enter a birthday
Tap the field to pick a date, or type it in
Distance units
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More number toys
Jump into another calculator.
ποΈ Date Calculator
The gap between any two dates β even billions of years.
π
Calendars
One day across the Gregorian, Maya, Islamic & more.
π’ Big Numbers
How big is a billion? Every named number, written out.
βΎοΈ Legendary Constants
Ο, e, Ο, β2 & Ο β endless digits, spirals & digit hunts.
𧬠Prime Lab
Factor numbers, GCD/LCM, primality & the Ulam spiral.
π Speed & Distance
Light-travel times and how far to real places.
π Converters
Every unit at once β length, mass, speed, data & more.
βοΈ Compare
You vs. a blue whale, a car vs. the speed of light.
πͺ Weight in Space
What you'd weigh on every planet, moon & black hole.
π Cryptography
Scramble a message with a dozen ciphers β Caesar, Morse & more.
π» How Computers Count
Binary, bytes & how a computer stores your words.
π² Random
Random numbers, dice & coins β with facts about every result.
π Probability & Odds
Birthday paradox, Monty Hall, dice curves & odds.