Automation and Electronics Calculators

Every calculator, chart and tool on the site, grouped by the job. Each one shows the formula and the steps with your numbers, keeps its inputs in the link so you can share or repeat a result, and prints a dated record. Nothing you type is uploaded.

Enclosures

IP rating chart — IP code meaning, decoder and comparison.
NEMA enclosure rating chart — NEMA types and the IP ratings they meet at least.

Sensors and signals

PT100 table — RTD resistance and temperature.
Thermocouple table — millivolts and temperature for type K, J, T and more.
4-20 mA calculator — loop current scaling.

Motors, drives and PLCs

Motor torque calculator — torque from power and speed.
Synchronous speed calculator — rpm from frequency and poles, slip.
Linear actuator calculator — force, speed and power.
PLC simulator — ladder logic in your browser.
Stepper motor calculator — steps per revolution, pulse rate, rpm and linear travel.
Pneumatic cylinder force calculator — extend and retract force from bore, rod and pressure.

Resistors and capacitors

Voltage divider calculator — output voltage and resistor values.
Parallel resistor calculator — resistors in parallel and series.
LED resistor calculator — current limiting resistor.
Resistor color code calculator — colour bands and values.
Capacitor series parallel calculator — total capacitance.
Capacitor code calculator — 104, 473 and 4n7 codes to pF, nF and µF.
PCB trace width calculator — trace width for a current.

Circuits and signals

RC time constant calculator — charge and discharge times.
Low pass filter calculator — RC, RL and LC cutoff frequency.
Reactance calculator — inductive and capacitive reactance, impedance.
Inductance calculator — air-core coils and toroids.
Audio crossover calculator — 2-way passive crossovers.
555 timer calculator — astable and monostable timing.
Op amp gain calculator — amplifier gain and output.
Decibel calculator — dBm, watts, dB ratios.
Wavelength calculator — frequency and wavelength.