Define linespacing using a Point-Value

i have to write a paper where the chair claims a font size of 12pt AND a line-spacing of 15pt (which seems 开发者_JS百科not to be \onehalfspacing).

Can anyone tell me how to define the spacing using the value 15pt?

Best regards and thanks! Philipp

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You can set the line spacing exactly by altering the \baselineskip value.

\setlength{\baselineskip}{15pt}

Note that you have to use this command inside the document environment in order for it to have an effect.