Why Use This Tool
Hex is used for memory addresses, color codes, and byte values, but calculations and user display often need decimal. Converting between bases is a common developer task.
Hex to Decimal Converter
Free online hexadecimal to decimal converter. Convert hex numbers to decimal, binary, and octal instantly. Supports large numbers via BigInt. — runs 100% in your browser, client-side only. No data is sent to any server. Free to use, no account required.
Free
Client-Side
No Login
No Storage
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How to Use the Hex to Decimal Converter
- Select the source base (binary, octal, decimal, hex).
- Enter the number and click Convert.
Supports arbitrarily large numbers via BigInt. Outputs in all four bases simultaneously.
What is Hex to Decimal Converter?
Hexadecimal to decimal conversion transforms base-16 numbers (0-9, A-F) into standard base-10 numbers. It reverses the decimal-to-hex conversion commonly needed in programming.
When to Use It
Use hex to decimal conversion when reading memory addresses, converting hex color values to decimal RGB, calculating byte values, or debugging hex output.
Common Uses
- Converting memory addresses to decimal
- Hex color to decimal RGB values
- Calculating byte values from hex
Frequently Asked Questions
How do I convert manually?
Multiply each digit by 16^position (right-to-left, starting at 0). For 'FF': F(15)×16¹ + F(15)×16⁰ = 240 + 15 = 255.
What about negative hex numbers?
Hex doesn't inherently represent negatives. Signed interpretation depends on context — 0xFF could be 255 (unsigned) or -1 (signed 8-bit).
Are A-F case sensitive?
No. 'FF', 'ff', and 'Ff' all equal 255. Hex digits A-F represent 10-15 regardless of case.