Generator Sizing Calculator
Calculate the minimum generator size (kVA) needed to power your essential appliances during an outage. Enter the running watts and surge watts of each device, and get the total power requirement.
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How to use this tool?
- 1 Enter the requested data in the fields above carefully.
- 2 Click the calculate button to process the information instantly.
- 3 Analyze the detailed result and the formula explanation presented below.
- 4 You can print, share, or even embed the calculator on your own site for free.
Unlike traditional static calculators, our tools adapt to specific user needs. They include detailed explanations of the formulas used, ensuring transparency in results. Furthermore, our design is focused on user experience, eliminating distractions and focusing on what really matters: your data and conclusions.
Previous Results
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Frequently Asked Questions
Running watts are the continuous power needed to keep an appliance running. Surge watts (or starting watts) are the extra power required to start motor-driven appliances like refrigerators or pumps. Generators must handle both.
Adding a 20% margin ensures the generator is not running at full capacity continuously, which can cause overheating and reduce lifespan. It also provides extra capacity for unexpected loads.
This calculator is designed for single-phase generators. For three-phase, the calculation is different (kVA = volts x amps x 1.732 / 1000). Consult an electrician for three-phase sizing.
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