Generator Size Calculator

Calculate generator size specifications, MEP engineering metrics, and cost estimates with ease.

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System & Cost Inputs

Enter capacity, distance, or project area parameters.

Primary Metric (Area / Length / Amps)

Secondary Parameter (Rate / Depth)

748 Gallons Optimal Standard Specification

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Always check local building codes (NEC for electrical, IPC for plumbing) before finalizing component sizing.

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Tank Volume (Gal) = (π × r² × Height in ft) × 7.48052

Applies standard hydraulic, electrical Ohm's law, and RSMeans construction cost index equations.

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Cost estimates vary by geographic region and labor rates. Consult licensed master tradespeople.

Follow these simple steps for accurate engineering and cost planning:

Determine tank dimensions, wire run distance in feet, or room square footage.

Enter circuit voltage/amperage, pipe friction rates, or labor cost multipliers.

Instantly view calculated liquid volume, recommended AWG gauge, or estimated total project budget.

Proper MEP sizing and cost estimating prevent safety code violations, equipment burnout, and budget overruns.

Input

Distance, current draw, or room area.

Output

Calculated capacity or estimated dollar total.

What is the maximum allowed voltage drop for branch circuits?

The National Electrical Code (NEC) recommends a maximum voltage drop of 3% for branch circuits and 5% total for feeder plus branch circuits.

How do you convert cubic feet of tank volume to liquid gallons?

Multiply the cubic foot volume of the tank by 7.48052 to convert into US fluid gallons.