Binary Clock
Binary Clock
Current Time
09:20:53
Each column represents a binary number. Lit circles = 1, dim = 0. Read top to bottom.
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What is a Binary Clock?
A binary clock displays time using the binary numeral system, where each digit is represented using only two symbols: 0 (off) and 1 (on). Instead of showing time as regular numbers, binary clocks use columns of LEDs or dots to represent hours, minutes, and seconds in binary format.
Each column of dots represents a binary number, read from top to bottom. The topmost dot has the highest value, and each subsequent dot has half the value of the one above it. By adding the values of all lit dots, you get the decimal number for that time unit.
Binary clocks are popular among programmers, engineers, and tech enthusiasts as both a functional timepiece and a conversation starter. They're also excellent educational tools for learning how computers represent numbers.
How to Read a Binary Clock
Understanding Binary
Each column represents a binary number. From top to bottom, the positions represent values of 32, 16, 8, 4, 2, and 1 (powers of 2). A lit dot means "add this value."
Example Reading
If dots at positions 8 and 4 are lit (binary: 001100), the value is 8 + 4 = 12. So if the hours column shows this pattern, the hour is 12.
Minutes and Seconds
Minutes and seconds use 6 dots each since they can range from 0-59. This requires up to 6 binary digits (32 + 16 + 8 + 4 + 2 + 1 = 63).
Hours Format
In 24-hour format, hours use 5 dots (0-23). In 12-hour format, only 4 dots are needed (1-12).
Frequently Asked Questions
Is a binary clock hard to read?
At first, reading a binary clock requires some mental math, but with practice it becomes second nature. Use the "Show Decimal Values" option to help you learn. Most people can read binary clocks fluently within a week of regular use.
Why would I want a binary clock?
Binary clocks are great for learning how computers process numbers, as a unique conversation piece, or simply because you enjoy the aesthetic of LED-style displays. They're popular gifts for programmers and tech enthusiasts.
What do the columns represent?
The three main columns represent hours, minutes, and seconds (if enabled). Each column shows its value in binary format, with lit dots representing 1s and dim dots representing 0s.