A modern electrical engineering toolbox. Calculate, convert and analyze electrical systems from one powerful web application.
OPEN TOOLBOX ⚡Select a calculation module — each tool opens only when you click it.
Place symbol-only equipment, snap to the engineering grid, then click terminals to route orthogonal connections.
Ask anything about electrical engineering,
get instant help and guidance.
Calculate capacitor-bank kVAr, corrected line current and capacitor capacitance for a power-factor correction panel.
Enter any two values. The remaining values are calculated automatically.
Select DC, single-phase AC or three-phase AC, then enter your available values.
Enter the electrical load and cable length. The calculator estimates current, voltage drop and a practical standard conductor size.
Preliminary EGC selection by protective-device rating. Verify against the adopted BNBC edition and the project authority.
Preliminary selection of a standard IEC contactor size based on load type, voltage and operating current.
Enter any useful combination of power, current, voltage and power factor. The tool derives the design current and recommends a practical busbar arrangement.
Calculate battery energy, usable capacity, backup time, battery bank configuration, charging requirements and solar charging estimates.
Select the bands to decode a 4-band resistor.
Enter any useful motor values. The calculator fills the remaining parameters automatically.
Enter any 2–3 core values and ElectraLab calculates the remaining transformer parameters automatically.
Convert common electrical units instantly.
Ask electrical engineering questions using the Electra AI chat assistant.