Decimal to Hex Converter
Convert decimal to hex instantly. Free online dec to hex calculator—divide by 16 and collect remainders 0-9, A-F.
How to Convert Decimal to Hex
To convert decimal to hex, repeatedly divide the decimal number by 16 and record the remainders. Convert remainders 10-15 to letters A-F. Read remainders from bottom to top. This decimal to hex conversion is essential for web development, programming, and creating hex color codes.
Decimal to hex: divide by 16, note remainders, read remainders in reverse. Pair with hex→dec for round-trip checks.
255₁₀ = FF₁₆.
CSS/HTML color values. The table and FAQ on this page walk through the factor if you need it.
Conversion Examples
Example: 255 to hex
- 255÷16=15 r15(F), 15÷16=0 r15(F) → FF
255 decimal = FF hex
Byte max.
Example: 42 to hex
- 42÷16=2 r10(A), 2÷16=0 r2 → 2A
42 decimal = 2A hex
Common test value.
Common Use Cases
- CSS/HTML color values.
- Low-level debugging output.
- Network and systems programming.
- Exam practice.
Frequently Asked Questions
How do I convert decimal to hex?
Repeatedly divide by 16; remainders are hex digits (reverse order).
What is 16 in hex?
10.
Do I need leading zeros?
Optional—0x0A and A are the same value; padding matters for fixed width.