Tip: Type in any field to convert to all other bases. Supports BigInt for large numbers.
Quick Common Values
| Dec | Binary | Oct | Hex |
|---|---|---|---|
| 0 | 0 | 0 | 0 |
| 8 | 1000 | 10 | 8 |
| 16 | 10000 | 20 | 10 |
| 64 | 1000000 | 100 | 40 |
| 100 | 1100100 | 144 | 64 |
| 255 | 11111111 | 377 | FF |
| 256 | 100000000 | 400 | 100 |
| 1024 | 10000000000 | 2000 | 400 |
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Key Features
Everything you need, right at your fingertips. Simple, fast, and built for everyone.
All Bases 2-36
Convert between binary, octal, decimal, hex, and any base from 2 to 36.
Developer Favorite
Perfect for programmers working with binary, hex, and bitwise operations.
Large Number Support
Handles very large numbers beyond standard integer limits.
Common Presets
Quick access to base 2, 8, 10, and 16 —the ones you use most.
Educational
Great for students learning number systems and computer science basics.
How to Use This Base Converter
Getting started is easy. Just follow these simple steps.
Enter a Number
Type a number in any base field.
See All Bases
Binary, octal, decimal, hex, and custom bases all update.
Use Presets
Quick-jump to common bases like binary or hexadecimal.
Copy Result
Grab the value you need for your code or homework.
About This Base Converter
Number base conversion is the process of converting a number from one base (or radix) to another. The decimal system (base 10) is what we use in everyday life, but other bases like binary (base 2), octal (base 8), and hexadecimal (base 16) are fundamental in computing and digital electronics.
Binary (base 2) uses only two digits: 0 and 1. It is the foundation of all digital computing because it maps directly to the on/off states of electronic circuits. Hexadecimal (base 16) uses 0-9 and A-F and is commonly used in programming because it provides a compact way to represent binary numbers —each hex digit corresponds to exactly 4 binary digits.
Converting between bases involves understanding place value. In any base b, each digit position represents a power of b. To convert from another base to decimal, you multiply each digit by its place value and sum the results. To convert from decimal to another base, you repeatedly divide by the target base and collect the remainders.
A base converter handles conversions between any bases from 2 to 36 quickly and accurately. It is essential for students, programmers, and anyone working with different number systems in computing, electronics, or mathematics.
Frequently Asked Questions
Which bases can I convert?
Any base from 2 to 36, including binary, octal, decimal, and hexadecimal. Type in one box and the others update.
What is 101010 in decimal?
Binary 101010 is decimal 42, octal 52, and hexadecimal 2A.
Is the number uploaded?
No. The conversion stays in your browser.