Hex Calculator
Adjust the inputs below. Results update as you type.
How it works
Hexadecimal (base 16) uses digits 0–9 and letters A–F (10–15). One hex digit represents 4 bits (a nibble); two hex digits represent one byte (0x00–0xFF). Memory addresses, HTML color codes (#RRGGBB), and file signatures are commonly expressed in hex. Hex addition: carry when sum exceeds 0xF. Multiplication follows the same rules as decimal with base-16 carries.
Input guidance
- Check units and decimal placement before running calculations.
- For percentage and ratio tasks, define the baseline value clearly.
- Use rounded output carefully and keep full precision for intermediate steps.
The formula
Hexadecimal is base-16, using 0–9 and A–F (where A=10 … F=15). Each position is a power of 16. Two hex digits represent one byte (0–255).
Worked example
Hex FF = 15×16 + 15 = 255. Hex 1A = 1×16 + 10 = 26 in decimal.
More examples to test
- Baseline example: solve with clean numbers first to verify formula direction.
- Edge-case example: test near-zero or boundary values to avoid interpretation errors.
How to interpret results
Use outputs as quick checks, then verify with step-by-step work for graded or high-stakes use.
When this can be inaccurate
Errors usually come from unit mismatch, wrong baseline assumptions, or rounding too early in multistep problems.
Change history
- July 2026: Quality-reviewed for publication with formula checks and explanatory copy updates.
Site-wide corrections also appear on the corrections log.
Build math and logic skills with guided lessons
Educational platform recommendation.
Frequently asked questions
Why is hex used in computing?+
It compactly represents binary: each hex digit equals four binary bits, so a byte is two hex digits — far easier to read than eight 1s and 0s.
What do letters mean in hex?+
A through F stand for the values 10 through 15, extending the digit set beyond 9 needed for base-16.
Where do I see hex?+
Color codes (#FF8800), memory addresses, and byte values in programming all use hexadecimal notation.
Why do my classroom and calculator results differ?+
Differences usually come from rounding conventions, order-of-operations handling, or different baseline assumptions.
What is the safest way to validate an answer?+
Recompute with units shown and check against a second method or manual arithmetic for critical problems.