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Transformer kVA Rating Calculator
Size a transformer in kVA from load power, power factor and growth margin.
bolt Free Online Tool
โก Instant Results
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Required kVA
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Size a transformer in kVA from load power, power factor and growth margin.
Transformer kVA Rating Estimator
Enter your numbers below for an instant estimate.
0
๐ก Tip: kVA = kW / power factor x (1 + margin).
How It Works
Key concepts behind this calculator
1
Enter Values
Fill in each field with your own numbers.
2
Calculate
Results update as you change the inputs.
3
Review
Read the breakdown and the explanation.
4
Adjust
Change values to compare scenarios.
Quick Reference Guide
Transformer Quick Guide
Typical values for reference.
| kW | PF | Margin % | kVA |
|---|---|---|---|
| 50 | 0.85 | 25 | 73.5 kVA |
| 120 | 0.85 | 25 | 176.5 kVA |
| 300 | 0.85 | 25 | 441.2 kVA |
| 800 | 0.85 | 25 | 1,176.5 kVA |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Common Questions
Transformer kVA Rating Calculator FAQ
Answers to common questions about this calculator.
Divide kW by the power factor.
Loads grow, and running near full load shortens life.
Common sizes include 100, 200, 500 and 1000 kVA.
The kVA figure is the same, only the current calculation differs.