Frances,
Here's my rule of thumb for breads and things like Calzone: take the recipe as written for a home oven, then bake at 500 F on the hearth for half the time. I usually place calzone near the oven mouth where it's a bit cooler to prevent scorching and guarantee a full bake. Have a look at
PizzaMaking.com - Pizza Making, Pizza Recipes, and More! for calzone recipes. It's a highly opinionated group, but a great resource.
Jim