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Transformer Capacity Calculator

Calculate the recommended distribution transformer size with a future-growth margin.

Formula v1.0.0GlobalMethodologytransformer-capacity-v1
How this is calculated
kVA = [(Connected load × diversity factor) ÷ power factor] × (1 + future growth %)

About this calculator

The transformer capacity calculator applies diversity and power factors to connected load, then adds a future-growth margin, to estimate the transformer size (in kVA) a building or site should install.

Worked example

200kW load, 0.7 diversity, 0.85 PF, 20% growth margin

Result: Recommended transformer size ≈ 197.6 kVA

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