Binary Register Calculator
Enter a binary, hexadecimal or decimal register value and inspect or manipulate individual bits. Set, clear, toggle and test register bits with automatic binary, hexadecimal and decimal conversion.
What Is a Binary Register Calculator?
A Binary Register Calculator helps you inspect and manipulate the individual bits of a fixed-width register. It is useful when working with processor registers, microcontrollers, embedded systems, hardware peripherals and low-level binary data.
Instead of manually performing bitwise operations, you can enter the register value and directly set, clear, toggle or test individual bit positions.
Register Bit Numbering
This calculator numbers register bits from right to left. The rightmost bit is bit 0, also called the least significant bit or LSB.
Bit: 7 6 5 4 3 2 1 0
Data: 1 0 1 1 0 0 1 0
Binary = 10110010
Hex = B2
Decimal = 178
Set, Clear, Toggle and Test Bits
Set Bit
Setting a bit changes the selected position to 1 while leaving all other register bits unchanged.
Clear Bit
Clearing a bit changes the selected position to 0 without changing the other bits.
Toggle Bit
Toggling changes a 0 to 1 or a 1 to 0 at the selected position.
Test Bit
Testing reports whether the selected register bit is currently 0 or 1.
Bit Mask Example
A bit mask contains a 1 at the position being manipulated and zeros in the remaining positions.
Selected position: Bit 3
Mask: 00001000
Hex mask: 08
Common Register Widths
| Register | Bits | Hex Digits | Unsigned Range |
|---|---|---|---|
| 8-bit | 8 | 2 | 0 to 255 |
| 16-bit | 16 | 4 | 0 to 65,535 |
| 32-bit | 32 | 8 | 0 to 4,294,967,295 |
| 64-bit | 64 | 16 | 0 to 18,446,744,073,709,551,615 |
Register Manipulation Example
Set bit 0: 10110011
Clear bit 7: 00110010
Toggle bit 2: 10110110
Where Binary Registers Are Used
Microcontrollers
Control registers configure timers, GPIO pins, communication interfaces and peripheral hardware.
Processors
CPU registers store values, addresses, flags and intermediate computational data.
Embedded Systems
Bit-level register manipulation is widely used to configure hardware efficiently.
Device Drivers
Drivers often set or clear individual register bits to control hardware functions.
Important Register Notes
Register values are treated as unsigned values.
The selected register width determines the maximum allowed value.
Leading zeros are preserved in binary and hexadecimal output so the complete register width remains visible.
Setting a bit already equal to 1 does not change the register.
Clearing a bit already equal to 0 does not change the register.
Toggling always reverses the selected bit.