Math calculator
Number Base Converter
Convert between binary, octal, decimal, and hexadecimal.
About the number base converter
The number base converter converts between binary, octal, decimal, and hexadecimal.
How to use this calculator
- 1
Enter value
Enter a number.
- 2
Choose source base
Select the base of your input number.
- 3
View results
See the number in all four bases.
How the calculation works
Converts input from selected base to all other bases.
Example: 255 decimal = 11111111 binary = FF hex = 377 octal.
When to use a calculator vs. mental math
Simple operations like percentages and proportions are great for mental math. Complex problems — quadratic equations, standard deviation, and base conversions — benefit from calculator precision. Always estimate the answer first to catch input errors, and verify results with a second method when possible.
Important limitations
This tool provides a mathematical estimate based only on the values entered. It does not account for regulations, taxes, lender fees, market conditions, or individual circumstances. Results are for planning purposes only — consult a qualified professional for regulated, medical, financial, or construction decisions.
Frequently asked questions about number base converter
How accurate is the number base converter?+
The calculation follows the displayed formula and retains full numeric precision before formatting the result.
Can I use the result professionally?+
Use it as a planning estimate. Confirm regulated, medical, financial, or construction decisions with a qualified professional.