Free electronics calculators for schematic and PCB design.
Use the calculators available now for practical first-pass circuit, analogue, filter, stored energy, and engineering unit checks.
These are the public calculators currently available in ECAD Workbench. This page only describes implemented calculator pages.
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All free calculators
Calculate voltage, current, resistance, and power from any two known Ohm's law values. Supports engineering notation such as 10k and 20m.
Calculate output voltage, divider current, and resistor power dissipation for a two-resistor voltage divider.
Compare ideal and loaded voltage-divider output, loading error, equivalent resistance, and branch currents.
Calculate LED series resistance, resistor dissipation, and a practical wattage recommendation.
Calculate resistor dissipation, apply design margin, and select a practical standard wattage rating.
Calculate pull-up resistance and power from pull-up voltage, low-level voltage, and sink current.
Calculate RC time constant and capacitor voltage during charge or discharge. Supports engineering notation such as 10k, 100n, and 1m.
Calculate capacitor discharge voltage, time to threshold, resistance, capacitance, and RC time constant for bleed paths and delays.
Calculate RC low-pass cutoff frequency, resistance, capacitance, and time constant.
Calculate RC high-pass cutoff frequency, resistance, capacitance, and time constant for AC-coupling networks.
Calculate AC coupling capacitor value, cutoff frequency, resistance, and time constant for first-order coupling networks.
Calculate ideal inverting and non-inverting op-amp gain, resistor values, dB gain, and output voltage.
Calculate energy and charge stored in a capacitor from capacitance and voltage.
Calculate magnetic energy stored in an inductor from inductance and current.
Convert engineering dimensions, temperature, voltage gain and dB, dBm and RMS voltage, complex values, angles, and SI prefixes.