No Holiday guest is more important than the turkey. But you might have a late arrival on your hands if you don’t get it in the oven on time. Planning a 3 p.m. meal? You’ll need to have a 20-pound bird (sans stuffing) cooking by around 10:30 a.m. Don’t stress about the math—just follow our easy chart, with recommendations from the USDA.

Graphic by Katie Field

Note: For safety reasons, the USDA recommends cooking stuffing outside of the turkey to guarantee uniform doneness. If you do choose to stuff it, check the temp of the center of the stuffing to make sure it, too, reaches the safe 165 degrees F (otherwise bacteria could contaminate your cooked turkey). Keep wet stuffing ingredients refrigerated ahead of time, and separate from dry ingredients until just before mixing, stuffing loosely and cooking. Sticking with a casserole dish? You should still cook the stuffing to 165 degrees F.

For more turkey and stuffing safety and cooking tips, check out the USDA’s site, and find a complete Thanksgiving dinner menu here.

This article originally appeared on RealSimple.com.

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