Reactance, Signals and Audio

These calculators cover alternating-current and signal questions. Find the reactance or inductance of a part, set an op amp gain, convert decibel units, relate wavelength to frequency, size a speaker crossover and pick a PCB trace width for a current.

Tools in this group

• Audio Crossover Calculator — Enter the crossover frequency and the speaker impedances to get the capacitors and inductors for a 2-way passive crossover.
• Decibel Calculator (dBm, dB, dBV, dBu) — Convert between dBm, watts, volts and dB ratios, or add up the gains and losses along a signal chain.
• Inductance Calculator (Inductor Formula) — Enter the coil's turns and dimensions to get its inductance, or the number of turns needed for a target inductance.
• Op Amp Gain Calculator — Choose the amplifier configuration and enter the resistors to get the gain in V/V and dB and the output for your input voltage.
• PCB Trace Width Calculator — Enter the current, copper weight and allowed temperature rise to get the minimum trace width, with resistance and loss for a length.
• Reactance Calculator (Inductive Reactance Formula) — Get the reactance of an inductor or capacitor at a frequency, or the impedance, phase and resonance of a series RLC circuit.
• Wavelength and Frequency Calculator — Convert frequency to wavelength or wavelength to frequency for light, radio in a cable or sound, with photon energy and antenna lengths.