Electrical Calculators

Electrical engineering is full of numbers that decide whether a job goes smoothly or comes back to bite you later — an undersized cable that overheats, a transformer that trips under load, a UPS that dies mid-shift because the runtime math was never actually checked. ElectroMechCalc's Electrical calculators exist to take the guesswork out of these decisions. Every tool here is built around a standard, published formula (IS / IEC / handbook references), so whether you're sizing a distribution transformer, converting kVA to kW, or working out the full-load current of a motor, you get a straight, checkable answer — not a black box.

Start with the basics — kVA ↔ kW, HP ↔ kW, and current conversions — or jump straight to sizing tools for transformers, DG sets, cables, inverters, UPS, and solar arrays. Each calculator shows its formula alongside the result, so you can verify the math or use it to explain the number to someone else.

What's Covered

Conversions: kVA↔kW, HP↔kW, kVA↔Current, and kW↔Current calculators handle the everyday unit-switching that comes up on almost every job, whether you're reading a motor nameplate or a generator datasheet.

Sizing & selection: Transformer Size, DG Size, Cable Size, Inverter Size, UPS Size, and Solar Panel Size calculators turn a connected load into a standard, purchasable equipment rating — with margin built in for starting current, future growth, and manufacturer step sizes.

Power quality & protection: the APFC Capacitor Calculator sizes a correction bank for a poor power factor, Motor Current gives full-load current for protection and cable sizing, and Battery Backup estimates runtime from your battery bank and load.

All-in-one toolkit: Electrical Pro Max bundles cable sizing, voltage drop, fault current, and load balancing into a single workspace for anyone doing several of these calculations back to back.

Who Uses These Calculators

Electrical contractors sizing a new panel or feeder, facility engineers checking whether an existing transformer has headroom for a new load, students working through motor and power-factor problems, and homeowners sizing a solar or inverter backup system all use these tools for the same reason — a quick, verifiable number instead of a rough guess.