Bitwright Hex Calculator

Bitwright is a programmer's calculator for firmware and embedded engineers, PLC and SCADA technicians decoding Modbus registers, network technicians, computer science students and CTF players. It works like a hardware calculator: a beige chassis, real keys and a fourteen-segment display that draws the hex digits A to F, with the word size and sign mode on the display.

BASES AND WORDS
• Hex, decimal and binary on their own keys and octal under Shift; changing the base never changes the bits
• Word sizes of 8, 16, 32 and 64 bits; unsigned, two's complement or one's complement; a smaller word truncates and says so, a larger one sign-extends a signed number
• Arithmetic wraps at the word size and lights C and V for carry and signed overflow (0xFF + 1 at 8 bits is 0 with carry)
• Division truncates toward zero as in C, MOD follows the sign of the dividend, and divide by zero says DIV 0
• Copy a result with its 0x, 0o or 0b prefix; paste hex, binary, octal, decimal or an IP address back in

LOGIC AND SHIFTS
• AND, OR, XOR, NOT and NEG at any word size (DEAD AND BEEF is 9EAD)
• Shift left and right, arithmetic shift right, rotate left and right, with the count typed after the key (= alone shifts by 1) and the last bit shifted out in the carry

BIT TOOLS
• Masks: the low n bits set (type n), the high-bit mask or the byte mask
• Test any bit, get the value with that bit set or cleared, or flip a bit in place
• Count the one bits, leading zeros and trailing zeros, or find the highest set bit; reverse the bits of a word
• Byte orders named by their pattern, as Modbus tools name them: DCBA (all bytes reversed), CDAB (word swap) and BADC (byte swap) for 32-bit values; at 64 bits the word swap reverses the four 16-bit registers (GHEFCDAB)

MODBUS AND CRC
• Build a list of up to 256 bytes: type a byte and press Byte, or push the bytes of the word; backspace removes the last one
• CRC-16 Modbus (request 01 03 00 00 00 0A: CDC5, sent as C5 CD), CRC-16 CCITT-FALSE, CRC-32 and CRC-8 SMBUS, plus SUM8, XOR8, LRC and the byte count

FLOATS
• IEEE 754 binary16, binary32 and binary64: type a decimal and get its bits (3.14 as a 32-bit float is 4048F5C3), or read the bits of a register as a decimal value
• NaN and infinity are shown as text; floats are bit patterns here, not arithmetic

SUBNETS
• IPv4 and CIDR: type a dotted address and a prefix and get the network, broadcast, netmask, wildcard, first and last host and the host count (192.168.1.10/24: network 192.168.1.0)
• A /31 has 2 hosts (RFC 3021, point-to-point links) and a /32 has 1, a single host

WORKS THE WAY YOU DO
• 10 memories, a tape of your calculations and a key guide
• Tables: ASCII, powers of two, CRC parameters with check values, and CIDR masks; pick a row to type its value
• Export a job strip: the tape, stamped with date and time, ready to attach to a ticket or work order, as text or PDF

FREE TO TRY, THEN UNLOCK ONCE
Free to try: every feature for 7 days. Then unlock Pro once — no subscription, no ads, works offline. Bases, word size and sign mode, arithmetic, logic, shifts and rotates, memory, tape, tables, copy and paste stay free; masks, bit tools, byte swaps, floats, subnets, CRC and job strip export need Pro.

PRIVATE BY DESIGN
Works offline, no account, no data collected.

How it's calculated: the methods and tables behind every result, at https://wrightcalc.app/bitwright/

Questions or feedback: [email protected]

Results follow the word size and sign mode shown on the display. Check anything that matters against a second source. The developer accepts no liability for loss or damage arising from use.