Transformer Size Calculator
Calculate recommended transformer rating based on load. Free online transformer sizing calculator for industrial applications.
Input Parameters
Calculation Result
Calculation Formula
Required kVA = Total Load (kW) / Power Factor
Recommended kVA = Required kVA × 1.25 (25% safety margin)
Primary Current (A) = (Required kVA × 1000) / (√3 × Voltage)
Note: Transformer rating is rounded to nearest standard size (5 kVA increments)
Example Use Case
50 kW load at 400V with PF 0.85 → Required: 58.8 kVA, Recommended: 60 kVA, Primary Current: 84.9 A