Convert Octal to Hexadecimal (Oct → Hex)

Octal to Hexadecimal

Rewrite an octal value in hexadecimal by converting the underlying integer into base 16.

Conversion Result

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Conversion Formula

Octal to HexadecimalConvert the octal value to decimal first, then rewrite that integer in base 16.
Why it helpsHex and octal are both compact alternatives to decimal in technical number-system work.

Conversion Examples

17 octal to hexadecimal17 octal becomes F hex. This is a compact example that lands right on the highest single hex digit.
77 octal to hexadecimal77 octal becomes 3F hex. It is a familiar practice example because the output mixes a numeral and a hex letter.
100 octal to hexadecimal100 octal becomes 40 hex. This shows how a clean octal rollover looks in a different base.
755 octal to hexadecimal755 octal becomes 1ED hex. This larger example is useful when comparing several number systems together.

Octal to Hexadecimal Table

OctalOutput
77
108
17F
2010
773F
10040
377FF
7551ED
1000200
17773FF

Popular Conversions

  • 7 octal = 7
  • 10 octal = 8
  • 17 octal = F
  • 20 octal = 10
  • 77 octal = 3F
  • 100 octal = 40
  • 377 octal = FF
  • 755 octal = 1ED

What is Octal and Hexadecimal?

Octal

Definition: Octal is a base-8 number system that uses digits 0 through 7.

History/origin: Octal was widely used in early computing because it groups binary digits more compactly.

Current use: It still appears in programming contexts, permissions notation, and number-system teaching.

Hexadecimal

Definition: Hexadecimal is a base-16 number system that uses digits 0-9 and letters A-F.

History/origin: Hexadecimal became popular because it compresses binary values into shorter, readable groups.

Current use: It is used in programming, memory addresses, color codes, and low-level technical documentation.

Related Number System Conversions

These nearby number-system pages help move the same integer into another notation or coded form.

Related ConversionFactor or RuleFormula
Number to binarybase 2write the integer with powers of 2
Number to hexbase 16write the integer with powers of 16
Octal to binarybase 8 to base 2convert octal to decimal, then decimal to binary
Octal to decimalbase 8 to base 10sum digit x 8^place
Octal to hexadecimalbase 8 to base 16convert octal to decimal, then decimal to hex
Numbers to Roman numeralsRoman-symbol rulesuse I, V, X, L, C, D, and M patterns
Number to letterspreadsheet-style base 26A=1, Z=26, AA=27
Number to nameword formbreak the number into grouped place values

Typical Use Cases

Programming basicsMove between decimal, binary, octal, or hexadecimal when reading code or low-level values.
Spreadsheet labelsTurn numeric positions into column-style letters or compact number labels.
Classroom examplesCompare several number systems side by side when learning place value and notation.
Technical notesTranslate a value into the format expected by a worksheet, tool, or device setting.

Frequently Asked Questions

Q: What digits are allowed in octal?

A: Octal uses only the digits 0 through 7. If an 8 or 9 appears, the input is not a valid octal number.

Q: Why do octal and binary relate so closely?

A: Because 8 equals 2^3, each octal digit lines up neatly with a three-bit binary chunk.

Q: Why does the converter check the raw text instead of just the numeric value?

A: A plain numeric parser would not catch invalid octal digits reliably. The converter checks the full text so only valid base-8 input is accepted.

Q: Can I include spaces in the octal input?

A: The converter trims ordinary spaces, but the actual digits still have to form a valid octal number.

Q: Does the converter support negative octal values?

A: This converter focuses on unsigned practice examples and standard positive octal notation.

Q: When is this useful?

A: It is useful in programming classes, file-permission notes, number-system practice, and technical references that still use octal.

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