Developer Tools
Hex Calculator
Hex — hex Calculator converts between hexadecimal and other bases, mapping each hex digit to four bits. This page runs that same calculation on your numbers, in your browser: no signup, no uploads, nothing stored.
Use Hex Calculator to convert and calculate in hexadecimal: give it your direction and value, press Calculate, and read off the value in hexadecimal and decimal — all worked out on your device.
Browser-side developer and utility helpers for everyday and learning use. Everything runs locally in your browser and nothing you enter is uploaded. Validate production or security-critical output with trusted, official tools before relying on it.
About this tool
Get hex right and the rest of the task gets easier. Hex Calculator converts between hexadecimal and other bases, mapping each hex digit to four bits. It matters when a format, encoding or size has to be exactly right for the system reading it. Add hex 1A (26) + 0F (15): the result is 29 = 41 in decimal. The tool above does the same computation in your browser — free, private, nothing stored.
How to use
- Choose hex-to-decimal or decimal-to-hex.
- Enter the value in the chosen base.
- Run the converter to change it.
- Read the decimal, binary, and octal forms.
Why use the Hex Calculator
Instant
Each result is computed on your device the moment you run the tool.
Private
The text and numbers you enter stay in your browser and are never uploaded.
Free
No signup and no paywall to use any tool in this set.
Works offline
Once the page has loaded it keeps working on a weak or dropped connection.
Built for developers
Plain inputs and outputs you can copy straight into code, configs, or notes.
Honest by design
Conversions and heuristics are for everyday and learning use; verify security-critical output with trusted, official tools.
Common uses
Use it when teaching binary and hex
Use it for reading memory or colour values
Use it when converting between number bases
Use it for working with flags and masks
Hex in computer-science coursework
Use it before writing a bitwise expression
Technical notes
Hex Calculator converts between hexadecimal and other bases, mapping each hex digit to four bits.
Results are reference values; validate against your own environment before relying on them in production.
Because it runs locally, results appear instantly with no server round-trip.
Worked example
Add hex 1A (26) + 0F (15): the result is 29 = 41 in decimal.
FAQ
Is a value like 1G rejected?
Yes. Only the digits 0 to 9 and letters A to F are valid hex characters, so 1G is rejected instead of being read as 1.
Is the hex input case sensitive?
No. Upper and lower case hex letters are both accepted and treated the same.
What other bases are shown?
Each conversion also lists the binary and octal equivalents next to the main result.
Does it convert hexadecimal fractions?
No. It converts whole, non-negative values; fractional hex is outside the scope of this converter.