Transformer Size Calculator (kVA & Full Load Current)
Estimate transformer capacity based on electrical load demand.
Use this transformer size calculator to estimate transformer capacity (kVA) and full load current requirements based on system voltage and load demand.
Load & System Profile
Equipment Load
Secondary Outputs
Recommended Transformer
Standard Size
Standard Rating
800
kVA
Nearest globally available standard size
Loading Metrics
System Data
Target Design Rating
735.3
kVA
Actual + Margin
Actual Required Base
588.2
kVA
Absolute minimum capacity
Secondary Full Load Amps (FLA)
1154.7
A
Max output current at secondary terminals (based on Standard Rating)
Engineering Reference
Base kVA Formula
kVA = kW / PF
Target Sizing Formula
Target = Base kVA × Margin
- kVA = Apparent Power capacity
- kW = Real Load Power
- PF = Power Factor (Cos θ)
- Auto-Snap = Selects from standard IEC/ANSI capacities (e.g., 250, 400, 630, 1000...)