Generator Sizing Calculator — Backup Power Sizing | Blackridge Research
Free ROI Tool

Generator Sizing Calculator Interactive Calculator ✦

Size a generator for backup power — total load plus the 25% safety margin every engineer uses.

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Your Inputs

Auto-filled with current list pricing — add to match your quote.

Your Estimated Results

Scenario:

Return multiple: Return on investment:
net of tracker cost
Payback period:
or annual investment

What this means

Trusted by 500+ companies · 150+ countries · 200+ sectors · Updated daily

Adjust the inputs above to calculate your results.

How It Works

Three steps to your number

01

Enter total load

Total electrical load in kilowatts (kW).

Use Cases

Who uses this calculator

Temporary power

size generators for construction sites.

Permanent installations

size building backup generators.

FAQ

Your questions, answered

25% is the standard margin for most applications.
Size for total load plus 25% safety margin.
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