How many photos do they want ? just a couple or 12?
Are you going to be taking the photos or have you already taken them and have them on file?
Do you get a title /byline on the calendar?
What is the total print run?
Will they use you next year?
These are the questions I would be asking calendars are a very fickle market now you have a 2 month window to sell them in and the market is already saturated.
You don't sell them copyright to your pics, just usage of the images for a year
this is correct unless they are willing to pay and pay well for copyright. They really don't need it anyway you are better to sell single usage rights but put it in a contract that it is for single use only.
Pick a number you think they can afford and go for it better to ask high and come down than to ask low and have them go "OK, Thats cheap!"
$100 to $400 per image sounds like a fair ballpark to start playing in.
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