After 17 years of designing industrial electrical systems — refineries, power plants, manufacturing facilities — we were tired of juggling Excel spreadsheets and $30,000 software licenses. So we built Voltcal.
Every electrical engineer knows the frustration. You need to size a cable. You open Excel, find the spreadsheet a colleague shared 5 years ago, hope the formulas are correct, and manually check the IEC table. It takes 20 minutes for something that should take 2.
Or you pay $15,000-$50,000 per year for ETAP — a powerful tool designed for large utilities running complex simulations. But you just need cable sizing and short circuit calculations. The price is absurd for 90% of what engineers actually do.
Voltcal exists to fix this. We built every calculation that engineers use daily — cable sizing, short circuit, arc flash, transformer sizing, earthing design, generator sizing, solar PV and 19 more — into a fast, accurate, browser-based platform. All global standards included. All free to calculate.
We charge only when you need to deliver professional PDF reports to clients — the moment your calculations need to leave your desk.
Every formula is referenced to the exact standard clause. We never approximate where precision matters. Results are peer-reviewed against industry software.
IEC, NEC, IS, BS, AS/NZS — all supported. Whether you're in Dubai, Houston, Mumbai, London or Sydney, your local standard is built in.
Built by someone who has designed real industrial plants — refineries, power plants, manufacturing facilities. We know what engineers calculate daily.
ETAP costs $30,000/year. Excel spreadsheets are error-prone. Voltcal gives every engineer — from freelancer to EPC firm — access to professional tools.
Voltcal founded by a practicing electrical engineer with 17 years of industrial experience
Phase 1 launched: Cable sizing, short circuit, transformer sizing — core daily-use calculators
Phase 2 & 3 launched: Arc flash, earthing, generator sizing, solar PV and 15 more calculators
Phase 4 launched: SLD Builder, Load Flow, Motor Acceleration — ETAP-level tools in your browser
Used by engineers in 50+ countries across 5 continents