Electronics

Free Amplifier Power Calculator — solve for output power, RMS/peak/peak-to-peak voltage, and current using Ohm's Law. Size amplifiers acoustically with SPL-based power requirements, headroom analysis, and heat dissipation estimates for Class A, AB, and D amplifiers.

Free antenna length calculator for dipole, quarter-wave vertical, full-wave loop, inverted vee, 5/8-wave vertical, and 3-element Yagi antennas. Get exact lengths in both feet and meters instantly.

Free battery capacity calculator for runtime, charge time, and energy storage. Calculate how long your battery will last, how long it takes to charge, and design series/parallel battery banks.

Free Battery Runtime Calculator — estimate how long your battery will last under any load. Supports Standard (Ah/Wh), Peukert lead-acid, and IoT duty-cycle modes with chemistry presets and scenario comparison.

Free PCB Trace Width Calculator based on IPC-2221 and IPC-2152 standards. Calculate the minimum copper trace width required to safely carry a given current with your chosen temperature rise, copper weight, and layer type.

Free PCB via size calculator using IPC-2221 and IPC-2152 standards. Calculate via current capacity, resistance, voltage drop, power loss, aspect ratio, annular ring, inductance, and capacitance for through-hole, blind, buried, and microvias.

Free RC (Resistor-Capacitor) Time Constant (τ) calculator — compute τ = R × C, cutoff frequency, rise time, energy stored, and charging/discharging curves. Supports RC and RL circuits with solve-for-any mode.

Free Solar Panel Calculator — estimate the number of panels, system size, battery storage, and 25-year payback for residential and off-grid solar installations.

Free Speaker Crossover Calculator — design passive crossover networks for 2-way and 3-way speaker systems. Calculates capacitor (µF) and inductor (mH) values for Butterworth, Linkwitz-Riley, Bessel, and Chebyshev filters with Zobel and L-pad support.