Embedded Calculators & Part Finder
Size a value with 64 free calculators, then find the real component that fits — in stock, at the best price. For MCU, power, RF & firmware. No account.
★ Popular
💡LED Resistor
⚡Ohm's Law
🚌CAN Bit Timing
🔻Voltage Divider
🔠Glyph Mapper
📦Struct Padding
PWM / Timer
Frequency, period, duty cycle
UART Baud Rate
Error rate, PASS/FAIL check
ADC Resolution
LSB voltage, SNR, dynamic range
Watchdog Timer
STM32 IWDG & WWDG timeouts
I2C Timing
Bus timing & pull-up values
CAN Bus Bit Timing
STM32 bxCAN/FDCAN & MCP2515
SPI Timing
Bit period, frame, throughput
RS-485 Bus
Cable length, termination, bias
LIN Bus Timing
Bit, break, frame time
Modbus RTU Timing
Char & inter-frame gaps
Ring Buffer / DMA
Buffer sizing
Register Map → C
Bitfield struct & macros
CRC → C Code
Lookup table & function
Stepper Motor
Steps/rev, microstep, pulse rate
BLDC / PMSM Speed
Motor electrical freq, pole pairs
Rotary Encoder
Motor encoder counts/rev
Motor Torque ↔ Power
N·m, RPM, Watts, hp
MOSFET Power Loss
Conduction & switching loss
Transformer Turns
Ratio, Ns, current ratio
LDO Dropout / Power
Heat dissipation & efficiency
I2S Audio Clock
BCLK, LRCLK, bit period
USB Data Lines
Bit time, 90Ω, termination
Ethernet Cable
Bit time, delay, 100m limit
Bit Field Visualizer
32-bit register breakdown
Q-Format Converter
Float ↔ fixed-point
Number Base Converter
Dec, Hex, Bin, Oct converter
IEEE 754 Visualizer
32-bit Float & 64-bit Double
Endian Swap
Big/Little/Mid-Endian byte swap
Struct Alignment
C struct padding & visualizer
Memory & Transmission
Bytes, baud rate & sample times
Glyph Mapper
7-Segment & Character LCD custom font generator
Crystal Load Cap
Oscillator load capacitor sizing
Ohm's Law
V, I, R, P — any 2 → all 4
Voltage Divider
Vout, loaded divider, Thevenin
LED Resistor
Series/parallel configs & E24
Resistor Code
Color bands & SMD decoder
Op-Amp Gain
Amp configurations & Schmitt
Instrumentation Amp
3-op-amp in-amp gain & Vout
Op-Amp Resistor
Inverting/Non-inv → R2,R3,R4
BJT Bias CE
Q-point & stability factor
NE555 Timer
Astable / monostable
Capacitor Charge
RC time constant, τ milestones
Buck / Boost
Switching regulator design
AWG Wire Gauge
Wire gauge & voltage drop
Series / Parallel
R · C · L equivalent value
LM317 Regulator
Adjustable Vout & R2 solver
Current Divider
Branch currents in parallel R
LC Resonance
LCR resonant freq, Q-factor
RC Filter
Cutoff frequency, gain & phase
dB Converter
dB, dBm & mW bidirectional
CRC Calculator
CRC-8/16/32, 7 polynomials
Checksum / CRC
XOR, Sum8/16, LRC, CRC
PCB Trace Calc
IPC impedance & trace width
Active Filter
Sallen-Key 2nd-order LPF/HPF
RF Trans. Line
Microstrip impedance (IPC-2141)
VSWR / Return Loss
Γ, return & mismatch loss
RF Link Budget
FSPL, Rx power, margin
Wavelength / Antenna
λ, λ/2 dipole, λ/4 whip
Attenuator Pad
T / Pi resistor values (dB)
Coil Inductance
Air-core solenoid (Wheeler)
Battery Life
Estimated system run-time
Temperature
Units & RTD sensor temps
Wheatstone Bridge
Bridge Vout & balance
Junction Temp
Thermal Tj & max power
Endianness & Byte Swapping Converter
Convert and visualize hexadecimal strings across Big-Endian, Little-Endian, and Mid-Endian formats with byte alignment validation.
Inputs
ℹ Non-hex characters are stripped automatically. Odd lengths will be padded with a leading '0'.
Swapping Results
Big Endian (ABCD - Raw)
—
Little Endian (DCBA - Swapped)
—
Mid-Little Endian (BADC)
—
Mid-Big Endian (CDAB)
—
Byte Array Decomposition
💡 Usage & Formula
Endianness refers to the sequential order in which bytes of data are stored in computer memory.
Formulas & Swaps:
- Big Endian (ABCD): Most significant byte is stored at the lowest memory address.
- Little Endian (DCBA): Least significant byte is stored at the lowest memory address (common in ARM Cortex-M, x86).
- Mid-Little Endian (BADC): Swaps adjacent pairs of bytes (half-word swap).
- Mid-Big Endian (CDAB): Swaps 16-bit half-words within a 32-bit word.
Usage: Type a hex sequence. The tool will parse, pad it to byte alignment, decompose it into a visual byte array block, and output the swapped representations instantly.
When you need it: Exchanging multi-byte values between a little-endian MCU and a big-endian ("network order") protocol, or reading a sensor that ships its data MSB-first.
Worked example: 0x12345678 in little-endian memory is the byte sequence 78 56 34 12; big-endian is 12 34 56 78. A 16-bit swap is (x >> 8) | (x << 8); htonl() byte-swaps a 32-bit value on a little-endian host.
Tips & gotchas:
- Most MCUs (ARM Cortex-M, AVR, x86) are little-endian; TCP/IP and many fieldbuses are big-endian.
- Use compiler builtins like
__builtin_bswap32— they compile to a singleREVinstruction on ARM. - Only multi-byte scalar fields need swapping; byte arrays and ASCII strings are already in order.
- Bit order within a byte is a separate question from byte order — don't conflate the two.
📖 References:
Endianness (Wikipedia)