Engineering Tools

A collection of handy calculators and reference tools for electrical engineering and general calculations.

⚡ Electrical & Electronics

Solve for voltage, current, resistance, or power from any two known values.

Voltage Divider

Calculate output voltage and resistor values for resistive voltage divider circuits.

RC Time Constant

Find the time constant τ, charge/discharge times, and cutoff frequency of RC circuits.

Calculate the correct current-limiting resistor value for an LED circuit.

Potential Divider

Unloaded and loaded potential divider — including loading error, design mode, and current sensing.

PCB Trace Width

IPC-2221 calculator for minimum trace width given current, copper weight, and temperature rise.

Controlled impedance for microstrip, stripline, and differential pairs. Includes substrate presets.

Op-Amp Configurations

Gain and output voltage for inverting, non-inverting, summing, differential, and buffer circuits.

RC Filter Designer

Design low-pass, high-pass, and band-pass RC filters. Cutoff frequency and attenuation table.

Battery Life Estimator

Estimate runtime from capacity, DoD, and efficiency. Supports active/sleep duty-cycle mode.

📐 General & Unit Conversions

Convert between units of length, mass, temperature, pressure, energy, and more.

Reference table for American Wire Gauge: diameter, area, resistance, and current ratings.

E Series Preferred Numbers

IEC 60063 standard values (E6–E192) for resistors and capacitors, with nearest-value finder.

dBm / Watts / Volts

Convert between dBm, milliwatts, watts, and RMS voltage across 50 Ω, 75 Ω, 600 Ω, and custom impedances.