Just in time for Thanksgiving, a new digital calculator is taking the guesswork out of portion planning to help hosts reduce the massive amount of food, money and resources that go to waste around the holiday. The “Guest-imator” is the latest waste-busting consumer resource from the Ad Council and Natural Resources Defense Council’s Save The Food national public service campaign. “Thanksgiving is a time to be grateful, yet it’s often unintentionally wasteful as well,” said NRDC senior scientist Dana Gunders. “Hosts can have the best intentions, but planning a meal for a large group is still tricky. This calculator can help cooks prepare enough for turkey-cranberry sandwiches the day after the feast, but avoid a stockpile of past-due leftovers a week later.” Created pro bono by SapientRazorfish, the Guest-imator is designed to eliminate unnecessary over-purchasing, saving consumers money and preventing food waste before it starts.