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Free calculators

Pick your calculator

Same reliable math, different gear lists. Choose the one that matches how you’ll use your power station.

How much backup power does your home need?

You get a battery size and inverter rating for your essentials, plus a printable summary.

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Size your camping power in two minutes

You get the battery size for your trip length, with 12V fridge and camp gear presets.

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Price per watt-hour calculator

You compare up to three power stations by what you pay per Wh and per watt of output.

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As an Amazon Associate I earn from qualifying purchases. GearB provides estimates only and is not medical or safety advice.