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
ADC Resolution Calculator
Calculate LSB voltage, SNR, dynamic range, and timing specifications for ADC configurations.
Input Parameters
Results
Total Steps—
LSB Voltage—
Full Scale—
Theoretical SNR—
Dynamic Range—
ENOB—
Single Conv Time—
Max Sample Rate—
Effective Resolution—
Total Scan Time—
Comparison Table
| Resolution | LSB @ Vref | SNR |
|---|
💡 Usage & Formula
ADC (Analog-to-Digital Converter) translates continuous analog voltages into discrete digital steps.
Formulas:
- LSB (Step Size):
Vref / 2^Resolution - Theoretical SNR:
6.02 * Resolution + 1.76 dB - Conversion Time:
(Sampling Cycles + SAR Cycles) / ADC_Clock
Usage: Use this calculator to find the voltage resolution (LSB) and conversion time for your MCU. Higher oversampling improves effective resolution (ENOB) at the cost of conversion speed.
When you need it: Working out the smallest voltage an ADC can resolve (one LSB), estimating the ideal signal-to-noise ratio, or choosing how many bits you need to cover a sensor's range with margin.
Worked example: A 12-bit ADC with Vref = 3.3 V has LSB = 3.3 / 4096 = 0.806 mV. Its ideal SNR is 6.02 × 12 + 1.76 = 74 dB, and a 10 mV signal spans about 10 / 0.806 ≈ 12 codes.
Tips & gotchas:
- Effective number of bits (ENOB) is always below the nominal count once you include noise, INL/DNL and reference error — treat the datasheet's ENOB, not the bit count, as real resolution.
- Oversampling and averaging buys ~½ extra bit per 4× samples, but only if there is at least 1 LSB of noise to dither against.
- Give the sample-and-hold enough acquisition time for your source impedance, or the reading droops; add a small buffer/cap for high-impedance sensors.
- Ratiometric measurement (sensor and ADC share the same reference) cancels Vref drift entirely.
📖 References:
Analog-to-digital converter (Wikipedia)