Do quick arithmetic on hexadecimal values
The hex calculator page is for arithmetic on base-16 values such as offsets, masks, checksums, and small address adjustments. It saves the extra step of converting both operands to decimal before adding, subtracting, multiplying, dividing, or taking a modulo.
Enter two hex integers, choose the operation, and the result is shown in hexadecimal, decimal, and binary. That side-by-side output helps verify the answer before it is copied into code, notes, or a debugging session.
How to use the hex calculator
- Enter the first hexadecimal integer in the first field.
- Enter the second hexadecimal integer in the second field.
- Choose add, subtract, multiply, divide, or modulo.
- Read the hex result first, then use the decimal and binary rows as a sanity check.
- Avoid division by zero and confirm whether your workflow expects integer division.
Hex calculator examples
| Input | Result | Why it matters |
|---|---|---|
FF + 1 |
100 |
A byte overflow into the next hex place. |
2A * 10 |
2A0 |
Multiplication by hex 10 shifts one hex digit. |
100 - 1 |
FF |
Subtracting one from hex 100 returns FF. |
Calculator input rules
Both operands must be hexadecimal integers. Optional signs and 0x-style notation are accepted where they make sense, but unsupported characters are rejected before arithmetic runs.
Division returns an integer quotient because this calculator is focused on base-conversion and systems work, where offsets and masks are usually whole-number values.
How arithmetic is evaluated
The operation is performed on the integer values represented by the hex inputs. The answer is then formatted back into hex and also shown in decimal and binary for comparison.
Modulo returns the remainder after integer division. It is useful for alignment checks, cyclic counters, and situations where a value needs to be reduced to a range.
Where hex arithmetic is useful
- Adding offsets while reading memory maps.
- Checking mask and flag calculations.
- Confirming examples before adding them to technical documentation.
- Comparing a hex result with decimal output from another tool.
Accuracy notes
This calculator does not simulate overflow for a fixed CPU width. If your target wraps at 8, 16, 32, or 64 bits, apply that width rule after calculating the mathematical result.
Negative results are displayed with a minus sign. Two's-complement formatting depends on width and is intentionally not guessed.
Related tools
If this page is close but not exactly the operation you need, the related converters below cover adjacent intents without mixing every feature into one crowded interface. You can move from hex calculator to Hex to Decimal, Binary to Decimal, Decimal to Hex, Binary Converter. Keeping each page centered on one core task makes the tool faster to use and makes the explanation easier to follow.
Frequently asked questions
Does division produce fractions?
No. Division returns the integer quotient.
Can I use lowercase hex?
Yes. Input is case-insensitive and output is uppercase.
Does it handle overflow?
It returns the mathematical integer result. Apply fixed-width overflow rules separately if needed.