Converter
Binary, Octal, Decimal, Hex & Every Base In Between
Convert any value between base 2 and base 60
Results are provided for informational purposes only and may contain errors. Please verify important information independently. Use of this tool is at your own risk.
How to convert decimal to hexadecimal
Convert decimal numbers to hexadecimal instantly: type a value and the hexadecimal result appears as you type. Below the converter you'll find the method to do it by hand, a worked example and a table of common values.
- Type or paste a decimal number into the box above. Negative numbers and fractions work too.
- The From and To bases are already set to decimal and hexadecimal, so the result appears right away: 255 becomes FF.
- Copy the result, or choose any other base from 2 to 60 to convert the same value.
Converting decimal to hexadecimal by hand
Divide the number by 16 and write down the remainder. Keep dividing the result by 16 until it reaches 0. The remainders, read from the last one to the first, are the hexadecimal digits. To check the answer, multiply each digit by its place value and add them up:
FF₁₆ = 15·16¹ + 15·16⁰= 240 + 15 = 255₁₀
Decimal to hexadecimal table
| Decimal | Hexadecimal |
|---|---|
0 | 0 |
1 | 1 |
2 | 2 |
7 | 7 |
8 | 8 |
10 | A |
15 | F |
16 | 10 |
42 | 2A |
64 | 40 |
100 | 64 |
127 | 7F |
255 | FF |
256 | 100 |
1000 | 3E8 |
1024 | 400 |
Decimal and hexadecimal explained
Decimal is base 10, the everyday number system with the digits 0 to 9. Each position is worth ten times the one to its right.
Hexadecimal (hex) is base 16: the digits 0 to 9 plus A to F for the values 10 to 15. One hex digit is exactly four bits, so a byte is always two hex digits, as in colors (#FF8800) and memory addresses.
Frequently asked questions
Can I convert negative numbers and fractions?
Yes. Put a minus sign in front of a negative number and use a point for the fraction, for example -12.5. A fraction that never ends in hexadecimal is cut off after 32 digits.
How large can the number be?
There is no practical limit. The converter uses exact whole-number arithmetic, so even numbers with hundreds of digits are converted without rounding.
Do uppercase and lowercase letters matter?
Not up to base 36: FF and ff are the same hexadecimal number. From base 37 upward, uppercase and lowercase letters are different digits.
Is this tool free?
Yes, it's free to use. No signup, no email required. Get results on this page.
How do I get my result?
Use the tool on this page. Your result appears here; no email delivery is required.