Number Base Converter
Number Base Converter: free, accurate and easy to use. Works in your browser with no sign-up.
How to use
Convert a number between binary, octal, decimal, hexadecimal and any base from 2 to 36, and see the value in all the common bases at once. Large numbers are handled exactly, with no rounding, which is useful for programming, networking and computer science homework.
- Enter your numbers.
- Results update instantly.
- Copy the result you need.
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Frequently asked questions
What do the letters A–Z mean in bases above 10?
In bases above 10, letters stand for digit values 10 to 35, so A is 10, B is 11 and Z is 35.
Are very large numbers supported?
Yes. The tool uses arbitrary-precision integers, so long values convert exactly.
Is it free?
Yes. All tools are free, with no sign-up and no limits.
Is my data stored or sent?
No. Everything is calculated in your browser and nothing you enter is sent anywhere.
Are the results exact?
Fractions, bases and GCD/LCM use exact integer arithmetic. Statistics use standard formulas on decimal numbers.