Number System Converter – Convert Binary, Decimal, Octal, and Hex Easily

If You Not sure how to switch between number systems like binary, decimal, octal, and hexadecimal? Don’t worry — it’s easier than it sounds. Our free online tool helps you convert numbers instantly. Whether you're a student, a coder, or just someone curious, this page explains it all in simple English.

A number system is a way of writing numbers. The system we use every day is the decimal system (base 10). It has 10 digits: 0 to 9.

But computers think differently. They use systems like:

★ Binary (base 2): Only 0 and 1. Used in computers.

★ Octal (base 8): Uses 0 to 7.

★ Hexadecimal (base 16): Uses 0–9 and A–F.

★ Binary ⇄ Decimal

★ Decimal ⇄ Hexadecimal

★ Octal ⇄ Binary

★ Hexadecimal ⇄ Octal

★ And more — all in one click!

Our converter is very simple. You enter a number, choose the system, and get the result.

Behind the scenes, it changes every number to decimal first, then to the format you want. This keeps the conversion accurate.

★ Binary 1010 → Decimal = 1×8 + 0×4 + 1×2 + 0×1 = 10

★ Decimal 255 → Hex = 255 ÷ 16 = F and F → FF

★ Hex 2F → Binary = 2 = 0010, F = 1111 → 00101111

★ Quick and Easy: Just type, click, and get the answer.

★ Great for Learning: Understand how conversions work step-by-step.

★ Works on All Devices: Use it on your phone or computer.

★ No App Needed: Just open the browser and go.

★ 100% Free: No sign-up. No limit.

★ Programming: Developers use binary and hex in code and memory.

★ Networking: IPs and subnetting often use binary and hexadecimal.

★ Electronics: Microcontrollers use hex and binary for settings.

★ Students: Computer science and digital logic subjects need conversions.

★ Debugging: Hex logs or dumps are easier to read when converted.

★ Binary to Decimal: 1101 → 8 + 4 + 0 + 1 = 13

★ Decimal to Binary: 13 → divide by 2: 1101

★ Octal to Decimal: 17 → 1×8 + 7 = 15

★ Hex to Decimal: A3 = 10×16 + 3 = 163

★ Copy result with one click

★ Lightweight and fast

★ Works offline (if page is cached)

★ No ads to disturb you

★ Easy for all age groups

Q. Is this tool beginner-friendly?

Yes! We made it very simple, so even if you're just starting to learn, you can use it with ease.

Q. Can I convert custom base numbers?

Right now, it supports base 2 (binary), base 8 (octal), base 10 (decimal), and base 16 (hex). These are the most useful and popular ones.

Q. Do I need to download anything?

Not at all. It works 100% online. Just open the site in your browser.

Q. Is this tool free to use?

Yes, it’s 100% free. No sign-up, no cost. Just open and use it anytime.

Try the number system converter now. Whether you’re doing homework, writing code, or just want to learn — this tool makes it super easy.

This free tool is supported by SmartCalcZone. We build helpful tools for learners and creators — fast, secure, and simple.