ConvertUnitOnline

Number Base Converter

Convert binary, decimal, hexadecimal, octal, and any base from 2 to 36 — instantly.

Free number base converter. Convert binary to decimal, hex to decimal, octal to decimal, and any base-2 through base-36 pair using exact BigInt positional math — not multiplication factors. Use the express converter for any unit pair, or open a quick conversion below.

Instant Private Free

1010 binary = 10 decimal

From

To

Format

Popular conversions

Hand-picked pairs with dedicated converter pages — open one to convert instantly.

Binary (Base-2) → Decimal (Base-10)

Binary to Decimal

Decimal (Base-10) → Binary (Base-2)

Decimal to Binary

Decimal (Base-10) → Hexadecimal (Base-16)

Decimal to Hexadecimal

Hexadecimal (Base-16) → Decimal (Base-10)

Hexadecimal to Decimal

Binary (Base-2) → Hexadecimal (Base-16)

Binary to Hexadecimal

Hexadecimal (Base-16) → Binary (Base-2)

Hexadecimal to Binary

Octal (Base-8) → Decimal (Base-10)

Octal to Decimal

Decimal (Base-10) → Octal (Base-8)

Decimal to Octal

Browse all number bases

Pick any base to open a two-way conversion. Each card shows a sample conversion and links straight into the converter.

From

To

BINARY (BASE-2)

1010 binary = 10 decimal

Binary → Decimal Decimal → Binary

BASE-3

10 base-3 = 3 decimal

Base-3 → Decimal Decimal → Base-3

BASE-4

10 base-4 = 4 decimal

Base-4 → Decimal Decimal → Base-4

BASE-5

10 base-5 = 5 decimal

Base-5 → Decimal Decimal → Base-5

BASE-6

10 base-6 = 6 decimal

Base-6 → Decimal Decimal → Base-6

BASE-7

10 base-7 = 7 decimal

Base-7 → Decimal Decimal → Base-7

OCTAL (BASE-8)

777 octal = 511 decimal

Octal → Decimal Decimal → Octal

BASE-9

10 base-9 = 9 decimal

Base-9 → Decimal Decimal → Base-9

DECIMAL (BASE-10)

10 decimal = 1010 binary

Decimal → Binary Binary → Decimal

BASE-11

10 base-11 = 11 decimal

Base-11 → Decimal Decimal → Base-11

BASE-12

10 base-12 = 12 decimal

Base-12 → Decimal Decimal → Base-12

BASE-13

10 base-13 = 13 decimal

Base-13 → Decimal Decimal → Base-13

BASE-14

10 base-14 = 14 decimal

Base-14 → Decimal Decimal → Base-14

BASE-15

10 base-15 = 15 decimal

Base-15 → Decimal Decimal → Base-15

HEXADECIMAL (BASE-16)

FF hexadecimal = 255 decimal

Hexadecimal → Decimal Decimal → Hexadecimal

BASE-17

10 base-17 = 17 decimal

Base-17 → Decimal Decimal → Base-17

BASE-18

10 base-18 = 18 decimal

Base-18 → Decimal Decimal → Base-18

BASE-19

10 base-19 = 19 decimal

Base-19 → Decimal Decimal → Base-19

BASE-20

10 base-20 = 20 decimal

Base-20 → Decimal Decimal → Base-20

BASE-21

10 base-21 = 21 decimal

Base-21 → Decimal Decimal → Base-21

BASE-22

10 base-22 = 22 decimal

Base-22 → Decimal Decimal → Base-22

BASE-23

10 base-23 = 23 decimal

Base-23 → Decimal Decimal → Base-23

BASE-24

10 base-24 = 24 decimal

Base-24 → Decimal Decimal → Base-24

BASE-25

10 base-25 = 25 decimal

Base-25 → Decimal Decimal → Base-25

BASE-26

10 base-26 = 26 decimal

Base-26 → Decimal Decimal → Base-26

BASE-27

10 base-27 = 27 decimal

Base-27 → Decimal Decimal → Base-27

BASE-28

10 base-28 = 28 decimal

Base-28 → Decimal Decimal → Base-28

BASE-29

10 base-29 = 29 decimal

Base-29 → Decimal Decimal → Base-29

BASE-30

10 base-30 = 30 decimal

Base-30 → Decimal Decimal → Base-30

BASE-31

10 base-31 = 31 decimal

Base-31 → Decimal Decimal → Base-31

BASE-32

10 base-32 = 32 decimal

Base-32 → Decimal Decimal → Base-32

BASE-33

10 base-33 = 33 decimal

Base-33 → Decimal Decimal → Base-33

BASE-34

10 base-34 = 34 decimal

Base-34 → Decimal Decimal → Base-34

BASE-35

10 base-35 = 35 decimal

Base-35 → Decimal Decimal → Base-35

BASE-36

10 base-36 = 36 decimal

Base-36 → Decimal Decimal → Base-36