Hexadecimal Calculator – Add and Convert Hex
Perform arithmetic and conversions on hexadecimal numbers.
About This Calculator
Perform arithmetic and conversions on hexadecimal numbers. Use the calculator above for instant results.
Worked Examples
- 163 + 31 = 194 | 0xC2
Answer: 0xC2 (194)
- 255 AND 15 = 15 | 0x0F | Masks low nibble
Answer: 0x0F (15)
- 4096 - 1 = 4095 | 0xFFF
Answer: 0xFFF (4095)
Who Uses This Calculator?
Hex arithmetic for systems programming.
Memory address calculations.
Hexadecimal arithmetic practice.
Hex manipulation for analysis.
Common Mistakes to Avoid
❌ Case doesn't matter for hex input
0xFF and 0xff are the same value. Hex is case-insensitive. Output is shown in uppercase by convention.
❌ Hex overflow
Watch for integer overflow in 32-bit or 64-bit bounds when doing hex arithmetic in programs.
Frequently Asked Questions
Hex arithmetic?
Same as decimal but base 16. After F comes 10 (sixteen). F + 1 = 10. FF + 1 = 100.
Common hex values?
0xFF = 255 (max byte). 0xFFFF = 65535. 0x7FFFFFFF = 2,147,483,647 (max signed 32-bit int). 0x80000000 = -2,147,483,648.
Hex in CSS?
#RRGGBB or #RRGGBBAA. Short form #RGB = #RRGGBB. #F00 = #FF0000 = red.