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@Tessie,
As Starson17 says your Sony PRS650 has options to make the text larger/smaller without having to worry about Calibre conversions. Did you try this as a first step?
Open the book you want to read and press the zoom button, which is second from the right (icon is a little +sign in a magnifying glass). It will open a small window to select the size (XS, S, M, L, XL, XXL). If one of those gives you what you want you don't need to do any more.
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