Hexadecimal to Decimal
Convert hexadecimal to decimal instantly — multiply each hex digit by its power of sixteen and add the results. Type in either box to convert both ways. Common when reading color codes, memory addresses, byte values and error codes that are written in hexadecimal.
Hexadecimal to Decimal conversion table
| Hexadecimal | Decimal |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 4 | 4 |
| 8 | 8 |
| A | 10 |
| 10 | 16 |
| 20 | 32 |
| 40 | 64 |
| 64 | 100 |
| 80 | 128 |
| FF | 255 |
| 100 | 256 |
How to convert hexadecimal to decimal
To convert hexadecimal to decimal, multiply each hex digit by its power of sixteen and add the results. For example, A in hexadecimal is 10 in decimal. The converter above validates each digit for its base and updates as you type, and the swap button flips the direction so you can go from decimal back to hexadecimal just as quickly.
Frequently asked questions
How do you convert hexadecimal to decimal?
To convert hexadecimal to decimal, multiply each hex digit by its power of sixteen and add the results. For example, A in hexadecimal is 10 in decimal. The converter above does it instantly — type a hexadecimal value on the left and the decimal result appears on the right, and you can type in either box to convert in the opposite direction. It only accepts valid digits for each base, so a stray character simply clears the result rather than giving a wrong answer.
What is A in decimal?
A in hexadecimal equals 10 in decimal. The conversion table on this page lists common values — 1 is 1, and it continues up to 100 = 256 — so you can read off everyday values at a glance. Any value in between converts exactly too, because the tool carries the full number rather than the rounded figures printed here.
What is the difference between binary, decimal and hexadecimal?
They are just different bases — different numbers of digits before you carry over. Decimal (base 10) is the everyday system with digits 0–9. Binary (base 2) uses only 0 and 1, which is how computers store everything at the hardware level. Hexadecimal (base 16) uses 0–9 then A–F, and is a compact way to write long binary values because each hex digit maps to exactly four bits. The same quantity can be written in any base; only its notation changes.
Is this hexadecimal to decimal converter free and accurate?
Yes — it is completely free with no sign-up, and it converts exactly using the standard positional method, validating that every digit is legal for its base. Common when reading color codes, memory addresses, byte values and error codes that are written in hexadecimal. Everything runs locally in your browser, so nothing you enter is uploaded or stored. For octal, custom bases and step-by-step breakdowns, the full number base converter handles any base from 2 to 36.
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