Ampero Electrical Calculator

Ampero is an electrical engineering calculator built for engineers, designers, and electricians who need fast, reliable checks in the field or at the desk. Size conductors, verify voltage drop, work through protection and machine-related estimates, and keep IEC- and NEC-oriented references close at hand—all in one modern, offline-friendly app. WHAT YOU CAN DO Free tools (always available) • Cable sizing — recommended cross-section with ampacity, installation derating, and voltage-drop limits. • Voltage drop — check line and load conditions against your maximum allowable drop. • Ohm’s law — quick relationships between voltage, current, resistance, and power. • Lighting — lumen-method style assistance for rough lighting layouts. Ampero Pro — full professional toolkit • Short-circuit — fault-current estimates aligned with IEC 60909-style methodology. • Circuit breaker — protective device selection helpers. • Conduit / raceway fill — sizing with NEC-oriented fill practice where applicable. • Transformer — kVA and winding-side estimates for common checks. • Motor — FLA, starting, and protection-oriented calculations. • Power-factor correction — reactive power and compensation estimates. • Grounding & protective earth — PE and earthing-system oriented guidance. STANDARDS & REFERENCE Switch between IEC and NEC contexts so inputs match the region you work in. Use the Reference section for built-in tables and code-oriented guidance (full IEC 60364 reference tables are included with Pro). WORKFLOW & OUTPUT • History — revisit past calculations (free tier keeps a small number of saved entries; Pro expands history). • PDF reports — export a clean, shareable summary with Pro; add your company name and logo for branded reports. • Themes & units — dark and light appearance; metric and imperial where supported. • Privacy-friendly core — calculation engines run on your device; use Ampero on site without depending on a connection. The free app may display advertising; Ampero Pro provides an ad-free experience and unlocks every professional module plus PDF export and full reference access as described in the app. IMPORTANT Ampero is for information and professional reference only. All results must be verified against local regulations, applicable standards, manufacturer data, and on-site conditions by a qualified professional before use in any installation or design sign-off. Terms and privacy are available from the app and on ampero.zukasoft.com. Subscription and one-time purchase options, pricing, and renewal terms are shown in the store at purchase time.