Nameplate current conversion

Transformer Full-Load Current Calculator

Calculate primary and secondary full-load current from transformer kVA, phase and line voltage without selecting a transformer.

Enter your values

Example values demonstrate the method; they are not product recommendations.

Your result

Enter measured or nameplate values to calculate.

Method

Single-phase current = VA ÷ voltage. Balanced three-phase line current = VA ÷ (√3 × line-to-line voltage).

Important limits

Rated current is not a protection or fault-current calculation. Impedance, vector group, inrush, harmonics, cooling and installation rules are excluded.

Technical reference

Calculate primary and secondary full-load current for single-phase or three-phase transformers from kVA and voltage.

What to enter

Use current, project-specific values for transformer kVA, primary and secondary voltage and phase. Check every unit before calculating and compare like-for-like inputs. The template controls the actual fields and calculations; this supporting copy does not replace its labels, formulas or result logic.

How to use the result

Treat primary and secondary full-load current as calculated references. Nameplate data, taps, efficiency, protection, inrush and installation requirements need engineering review.

Before making a decision

Verify source measurements, equipment specifications and operating conditions. Have a qualified professional review the final selection, safety and installation requirements before purchase, connection or construction.