The clue is in that image you posted, the online calculator is using the bulk standard Lichello way - percentage of stock value. Newport uses percentage of Portfolio Control.
i.e in that image
Stock Value above $11236, sell price $112.36 (stock value below $9000, sell $900)
Generally the two different choices (percentage of Portfolio Control (Newport) and percentage of Stock Value (bulk standard Lichello)), work out much same overall. Some interim differences will be apparent, but neither has a overall edge.
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