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
IEEE 754 Floating-Point Visualizer
Interactive visualization of 32-bit Single Precision and 64-bit Double Precision floating-point numbers.
Inputs
IEEE 754 Representation Breakdown
Sign Bit—
Biased Exponent—
Fraction (Mantissa)—
Decoded Value—
Interactive Bit Grid
ℹ Click on individual bits to toggle their state and watch the value update in real-time.
Mathematical Equation
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💡 IEEE 754 Float & Double Specification Guide
IEEE 754 is the technical standard for floating-point computation established by the IEEE in 1985.
Layout Specifications:
- Single Precision (32-bit): 1 sign bit [31], 8 exponent bits [30-23] (bias = 127), 23 fraction bits [22-0].
- Double Precision (64-bit): 1 sign bit [63], 11 exponent bits [62-52] (bias = 1023), 52 fraction bits [51-0].
Special Cases:
- Zero: Exponent = 0, Fraction = 0
- Denormalized (Subnormal): Exponent = 0, Fraction ≠ 0. Value is (-1)S × 0.F × 21-bias.
- Infinity: Exponent = All 1s (255 or 2047), Fraction = 0
- NaN (Not a Number): Exponent = All 1s, Fraction ≠ 0
When you need it: Debugging why a float comparison fails, reading a float out of a raw memory dump, or understanding precision loss when porting math to a 32-bit MCU.
Worked example: 0.1f is stored as 0x3DCCCCCD ≈ 0.100000001 — not exact, which is exactly why 0.1 + 0.2 ≠ 0.3. A float32 is 1 sign bit, 8 exponent bits (bias 127), and 23 mantissa bits.
Tips & gotchas:
- Never compare floats with
==; test|a − b| < epsiloninstead. NaNis never equal to anything, including itself — use it to detect it (x != x).- float32 carries ~7 significant decimal digits, float64 ~15; pick the width your dynamic range needs.
- Watch byte order when reading floats from a dump — the four bytes are stored little-endian on most MCUs.