Printable Transformer Sizing Worksheet
This worksheet is for electricians, engineers, and anyone sizing a transformer from a load list. It includes columns for Load, Phases, Primary V, Secondary V, kW, PF, Margin %, Chosen kVA, kVA needed, Primary FLA, and Secondary FLA. Enter 1 or 3 phases, the primary and secondary voltages, load kW, power factor, and margin. The sheet calculates the kVA needed and the full-load currents for the kVA you choose in column H.
Free printable · PDF
- 1 page
- US Letter, landscape — choose “Fit to page” for A4
- PDF, 59 KB
Free for personal, family and classroom use.
Use one row for each load, such as a workshop entry with 3 phases, 480 V primary, 208 V secondary, 60 kW, 0.9 PF, and 25% margin. Fill in the chosen kVA in column H, then read the calculated kVA needed and current values. Print it and keep it with project notes for quick transformer checks.
Good for
- Size transformers from load data
- Check primary and secondary full-load current
- Compare kVA options for each load
Tip: Print landscape and keep one copy for each transformer load calculation.
5 files · XLSX, PDF, DOCX
Get every sheet: Transformer Sizing Pack
This sheet plus 4 more in one download, with the editable Excel and Word files. Excel transformer sizing workbook, printable full-load amps tables for single- and three-phase sizes, a transformer nameplate record sheet and a sizing checklist.
$3.00 USD, one-time 5 files · about $0.60 each
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Printable 1-Phase Transformer FLA Chart
Transformer Nameplate Record Sheet
Printable Transformer Sizing Checklist