Generator sizing calculator
Enter each device's running watts and the highest starting surge to get the recommended generator size.
Result
A fridge (200 W running, 1200 W surge) plus lights (100 W) suggests a generator of at least 1,500 W.
Example
Estimate the wattage a generator needs to supply your loads in your browser. Values stay on your device.
A fridge (200 W running, 1200 W surge) plus lights (100 W) suggests a generator of at least 1,500 W.
Processed locally in your browser.
Methodology
Recommended = Σ(runningWatts) + maxSurge, where maxSurge is the largest starting surge among motor-driven devices.
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