Electrical Transformer Calculators for Engineers & Students

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ENGINEERING SUITE  ·  Transformer Phase 1

Transformer Calculators

Professional design and analysis tools for power and distribution transformers. Calculate kVA ratings, full load currents, turns ratio, efficiency, and voltage regulation per IEEE/IEC standards.

Transformer kVA Calculator

Calculate the required apparent power rating (kVA) based on voltage and load current. Supports both Single-Phase and Three-Phase systems.

Phase System Single Phase (1Ø) Three Phase (3Ø)

Line Voltage (V)

Load Current (A)

Full Load Current (FLC) Calculator

Determine the primary and secondary full load currents for a given transformer kVA rating.

Transformer Rating (kVA)

Phase System Single Phase (1Ø) Three Phase (3Ø)

Primary Voltage (V)

Secondary Voltage (V)

Transformer Turns Ratio

Calculate the turns ratio (a) and voltage ratio based on primary and secondary winding voltages.

Primary Voltage (V)

Secondary Voltage (V)

Transformer Efficiency Calculator

Compute transformer efficiency by analyzing core (iron) and winding (copper) losses against the active power output.

Active Output Power (kW)

Iron (Core) Loss (W)

Copper (I²R) Loss (W)

Voltage Regulation Calculator

Estimate voltage regulation using percentage resistance (%R) and reactance (%X) impedance values. Includes power factor correction.

Percentage Resistance (%R)

Percentage Reactance (%X)

Power Factor (0.0 - 1.0)

PF Type Lagging (Inductive) Leading (Capacitive)

⚠️ Engineering Disclaimer:
This calculator is for estimation purposes only. Always verify with transformer nameplate data and local electrical codes (IEC 60076, IEEE C57). Actual performance depends on harmonics, temperature, and specific design construction.

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