Ones Complement Calculator
Ones Complement with stated conventions, validation and a worked example.
Formula
- Use the units shown beside each field.
- Results update automatically whenever you change an input.
- Displayed values use up to four decimal places, or scientific notation for very small or large numbers. Calculations use standard floating-point arithmetic; exact integer and fraction tools identify their own precision rules.
- This returns a fixed-width bit complement, not a signed ones-complement interpretation.
Example Calculation
- Unsigned value: 5
- Bit width: 8
At width8, complementing 00000101 produces 11111010, decimal 250.
Frequently asked questions
How do I use this calculator?
Enter unsigned value, bit width. The result updates automatically. Use Reset to restore the example values.
What method does it use?
result = (2^width−1) XOR value. This returns a fixed-width bit complement, not a signed ones-complement interpretation.
Why might a rounded result differ?
The calculation keeps full numeric precision internally, then rounds the displayed result. Rounding intermediate steps by hand can produce a slightly different answer.
Are my inputs saved online?
No. This calculator processes your inputs in your browser. A recently used list stores only calculator names on this device, not your entered values.
Check the assumptions and units before using this result. Read about calculation methods.