Multi-base number calculator — view any number in binary, octal, decimal, and hexadecimal
Enter a number, select its base, and see all base representations update in real time.
Uses digits 0 and 1. The fundamental language of computers. Each digit is a bit.
Uses digits 0–7. Commonly used in Unix file permissions (chmod) and legacy systems.
The standard human-readable number system using digits 0–9. What we use every day.
Uses digits 0–9 and letters A–F. Used for memory addresses, color codes, and debugging.
A programming calculator is an indispensable tool for developers who work across different number bases daily. Unlike a standard calculator, a programming calculator shows you the same value in binary, octal, decimal, and hexadecimal simultaneously, helping you understand how data is represented at the hardware level. When debugging memory addresses, setting bitmasks, or configuring register values in embedded C code, flipping between base representations manually is error-prone and time-consuming. A dedicated programming calculator eliminates those mistakes by providing live bidirectional conversion — type in any base and see all others update instantly. For students learning computer architecture or preparing for technical interviews, a programming calculator makes abstract concepts like two's complement, bit shifting, and mask operations tangible and visual. Whether you are a firmware engineer, a cybersecurity analyst, or a web developer decoding hex color values, a reliable programming calculator saves time and reduces mental overhead.
Developers reach for a programming calculator in many real-world scenarios. Network engineers convert between decimal IP addresses and hexadecimal packet headers. Embedded systems programmers verify register configurations by checking binary bit patterns. Security analysts decode hex dumps from vulnerability scans and memory forensics. Web developers calculate RGB color values by converting hex triples to decimal. Even game developers use programming calculators to work with color palettes, texture formats, and low-level graphics APIs. The key advantage of an online programming calculator is that it runs entirely in the browser — no installs, no command-line tools, and no context switching away from your development environment. For anyone who needs to reason about numbers in multiple bases, a programming calculator is the fastest path from question to answer.
This 32-bit programming calculator uses standard JavaScript number operations (53-bit float with 32-bit integer precision via >>> 0). The 64-bit programmer calculator uses JavaScript BigInt for exact arithmetic beyond 2^53. Use this one for everyday tasks like color codes, network ports, and typical register values. Use the 64-bit one for memory addresses, large file offsets, and cryptographic parameters.
Enter a negative number like -1 in decimal mode. The calculator uses the unsigned right shift operator (>>> 0) to convert to a 32-bit unsigned value internally, so -1 becomes 0xFFFFFFFF in hex. If you need signed hex representation with proper two's complement for larger values, use the 64-bit programmer calculator instead.
Octal groups bits in threes. For example, decimal 255 is binary 11111111, grouped as 11 111 111, which becomes octal 377. Unlike hex where each digit maps to four bits (which aligns perfectly with 32-bit boundaries), octal's three-bit grouping can look less natural on modern systems. It's still important for Unix permissions and some embedded toolchains.
Absolutely — this is one of the most common use cases. Enter FF0000 in hex mode to see decimal 16711680 (red), 00FF00 for green (65280), 0000FF for blue (255). The binary display shows exactly which bits correspond to each color channel. Web developers use this programming calculator daily to convert between hex color codes and decimal RGB values.
Invalid characters are automatically filtered out and ignored. For example, if you type "1A2G3" in decimal mode, only "123" is used. The calculator silently strips non-numeric characters rather than showing an error, so you can paste hex values and see partial results as you type. This makes it tolerant of input from different sources.
AND, OR, XOR, NOT — online bitwise operations
Decode hex strings to readable text instantly
Compute SHA-256 checksums in your browser
64-bit base conversion with BigInt precision