Electronics & circuits
Calculate ideal circuit values and compare specifications. Work stays in your browser tab.
Current from voltage and resistance
Calculate current and resistor dissipation for a DC resistive load.
Voltage divider calculator
Calculate unloaded output of a two-resistor voltage divider.
LED series resistor estimate
Estimate series resistance from supply, LED forward drop and chosen current.
Two resistors in parallel
Calculate equivalent resistance of two ideal parallel resistors.
RC time constant
Find the time constant of an ideal resistor-capacitor network.
RC cutoff frequency
Calculate the -3 dB cutoff of an ideal first-order RC filter.
LC resonance calculator
Find the ideal resonant frequency of an inductor-capacitor pair.
Capacitor stored energy
Estimate energy stored in an ideal capacitor at a stated voltage.
Wire resistance estimate
Estimate resistance using your material resistivity, length and cross-section.
Ideal transformer turns ratio
Estimate secondary RMS voltage from primary voltage and turns.