Roast a whole chicken by weight — with the safe target temperature and an honest time estimate for planning.
A 4 lb whole chicken at 325°F takes roughly 1½ hours. It's done at 165°F in the thickest part of the thigh — check there, away from the bone.
This page locks the whole chicken roasting time into the roasting calculator. Time is a planning estimate — oven calibration, shape, bone, and starting temperature all change it. The reliable test is a probe thermometer in the thickest part, away from bone: pull at temperature, not at the clock.
Need a different cut or weight? Use the full roasting time calculator.