Convert Binary to Base 7

Convert Binary (bin) to Base 7 (base 7) instantly and accurately.

Selected Binary (bin) - available characters: 0, 1

Conversion Formula

Step-by-step example using the value 42 (decimal):

Convert Binary (base 2) → Base 7 (base 7)

Step 1: Expand each digit of 101010 (bin) by position:

        1 × 2^5 = 32
        0 × 2^4 =  0
        1 × 2^3 =  8
        0 × 2^2 =  0
        1 × 2^1 =  2
        0 × 2^0 =  0
        ────────────
        Sum = 42 (decimal)

Step 2: Divide 42 by 7 repeatedly (read remainders upward):

        42 ÷ 7 = 6  r 0
         6 ÷ 7 = 0  r 6
        Read remainders upward: 60

────────────────────────────
Result:  101010 (bin) = 60 (base 7)

About Binary

Binary (base 2) is the foundational numeral system of all digital electronics, using only 0 and 1. Each position represents a power of 2: 2⁰=1, 2¹=2, 2²=4, 2³=8. Leibniz formalised it in 1679; Shannon applied Boolean logic to circuits in 1948. 8 bits = 1 byte (256 values) - the fundamental unit in every CPU from the 8080 to ARM Cortex-X. Every integer, float, character, pixel, and instruction in any digital device is ultimately binary. Conversion: decimal 42 = 32+8+2 = 2⁵+2³+2¹ = 101010₂.

About Base 7

Septenary (base 7) uses digits 0-6. Each position is a power of 7: 7⁰=1, 7¹=7, 7²=49. Seven is prime, so every fraction p/q (q not divisible by 7) produces a purely repeating expansion. Seven days of the week derive from Babylonian astronomy (the 7 naked-eye celestial objects). Reed-Solomon codes used in QR codes and Blu-ray draw on prime-field properties of GF(7). Conversion: decimal 42 = 6×7+0 = 60₇.

Quick Reference Table

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