Transformer kVA Calculator Based on Load
Easily calculate transformer kVA size from load in kW or HP, voltage, and power factor. Supports single-phase and three-phase calculations.
transformer sizing calculator
Transformer kVA is calculated on the basis of load power and power factor:
01. Single phase: KVA = (kW/PF)
02. Three phase: kVA = (kW / PF) / /Sqrt3 1000 / Voltage
Formula & Table Summary:
- 1φ: kVA = (V × I)/1000 or kVA = kW/PF
- 3φ: kVA = (√3 × V × I)/1000
- kW from HP: kW = HP × 0.746
transformer load calculator
This calculator of transformer kVA rating can be used to estimate how much kVA rating a transformer will require with respect to the demand of the load. Input wattage or horsepower, operating voltage, power factor, and either single-phase or three-phase connection. The calculator calculates the kVA size using the standard formula: kVA = kW 1/PF and (kVA) = (3/2) (kW) 1/PF. One may also change hp to kW by using 1 hp = 0.746 kW first and then calculating. This is a handy tool that engineers, electricians, and technicians use when selecting distribution transformers to power motors, heat, air conditioning, pumps, or other industrial equipment. It does not allow underrated transformers to overheat and load, and oversized ones to waste investment. Having formulas and sample tables of data, as well as frequently asked questions, gives a quick calculation and some knowledge to the user. Apply it to check designs, size transformers to optimize efficiency, and to analyze power delivery in any residential, commercial, or industrial system.
kva calculator based on load
| Load (kW/HP) | PF | Voltage | Phase | kVA |
|---|---|---|---|---|
| 50 kW | 0.9 | 415 | 3φ | 61.7 |
| 20 kW | 0.85 | 230 | 1φ | 23.5 |
| 100 hp | 0.9 | 415 | 3φ | 95.7 |
