Engineering Tools

Calculators and reference tools for electrical and electronics engineering — all in the browser, no sign-up required.

⚡ Electrical & Electronics

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

Voltage Divider

Output voltage, find-R2 mode, and advanced analysis with resistor tolerance and constant-current load.

RC Time Constant

Time constant τ, charge/discharge curves, and cutoff frequency — with interactive graph.

LC Resonant Frequency

Find resonant frequency, inductance, or capacitance for LC tank circuits.

Calculate the correct current-limiting resistor for single or multi-LED circuits.

Parallel & Series Resistor

Equivalent resistance for any number of parallel or series resistors.

Wheatstone Bridge

Find unknown resistance or output voltage for balanced and unbalanced bridges.

Op-Amp Configurations

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

Differential Amplifier

Calculate Vout or find matched resistor values for a four-resistor difference amplifier.

RC Filter Designer

Low-pass, high-pass, and band-pass RC filters with cutoff frequency and attenuation table.

LC ladder filter component values for Pi and T topologies at a given impedance and cutoff.

Battery Life Estimator

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

PCB Trace Width

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

PCB Conductor Current

Current capacity, resistance, voltage drop, and power dissipation for a PCB trace cross-section.

IPC-2221 current capacity, resistance, and inductance for PCB vias.

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

Planar Inductor

Mohan modified Wheeler formula for square, hexagonal, octagonal, and circular spiral inductors.

NEXT/FEXT backward and forward crosstalk coefficients for microstrip and stripline pairs.

📡 RF & Signal

Free-space and guided wavelength from frequency, permittivity, and permeability.

Effective Permittivity

εr_eff for microstrip and embedded stripline, plus Wadell impedance calculation.

Frequency and component deviation from PPM error, TCR, and temperature change.

dBm / Watts / Volts

Convert between dBm, milliwatts, watts, and RMS voltage across common impedances.

📐 General & 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.

Binary / Hex / Decimal

Convert between bases with an interactive bit visualiser, clickable bit toggles, and 4-bit reference table.