Understanding a register or colour value
A hex component converts to the decimal number it represents, which is easier to reason about arithmetically.
Hex to Decimal
Convert a hexadecimal number to decimal in your browser, with full precision for large values.
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Converts hexadecimal number to decimal in this tab, with nothing sent anywhere.
Runs entirely on your deviceThe conversion happens in this browser tab. Nothing you type is uploaded, logged or stored, which is worth knowing for anything you would not paste into a search box.
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Browse all developer and data toolsAbout Hex to Decimal
Going the other way, from hex to decimal, is what you do when a value written for the machine needs to be understood by a person or fed into arithmetic that thinks in tens. A colour component, a register value, a hash fragment: all are written in hex but often need their plain decimal size. The same precision trap applies as strongly here. A hexadecimal value is frequently large - that is much of why it was written in hex in the first place - and a converter that reads it into an ordinary number loses accuracy past a certain size, turning the last few decimal digits into rounded noise. This tool reads the hex into an arbitrary-precision integer, so even a full 64-bit value converts to its exact decimal equivalent with no digits lost.
Using Hex to Decimal
- The hex is read into an arbitrary-precision integer, so there is no size at which the result becomes approximate.
- A 0x prefix, spaces and separators are stripped, so a value copied from source code or a debugger works directly.
- Each hex digit contributes its value, high digits weighted by powers of sixteen, accumulated exactly.
- The output is the plain decimal number, ready for arithmetic or for a person to read.
- Case is irrelevant; upper and lower hex digits are treated the same.
Where hex to decimal helps
Reading a large hex identifier
A 64-bit hex value converts to its exact decimal size, with no rounding of the final digits.
Before you use the result
- It converts the numeric value of the hex, not hex-encoded text. Use the hex to text tool for the latter.
- Only non-negative whole numbers are handled; a two's-complement negative depends on bit width, which is not assumed here.
- A character that is not a hex digit is refused, so a typo is caught rather than silently altering the result.
- The decimal of a large hex value is long, which is normal.
- This is not decryption; hex conceals nothing.
Questions about Hex to Decimal
Will a big hex value stay exact?
Yes. Arbitrary-precision integers are used, so even a 16-digit hex value converts without rounding.
Does it accept a 0x prefix?
Yes. Prefixes, spaces and separators are stripped before conversion.
Is this the same as hex to text?
No. This converts the number's value; hex to text decodes hex bytes into characters.
Does case matter?
No. Upper and lower hex digits are equivalent.
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