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Background: A test that helps predict the time to the final menstrual period (FMP) has been sought for many years., Objective: To assess the ability of antimullerian hormone (AMH) measurements to predictions the time to FMP., Design: Prospective longitudinal cohort study., Setting: The Study of Women's Health Across the Nation., Participants and Measurements: AMH and FSH were measured in 1537 pre- or early perimenopausal women, mean age 47.5 ± 2.6 years at baseline, then serially until 12 months of amenorrhea occurred. AMH was measured using a 2-site ELISA with a detection limit of 1.85 pg/mL., Main Outcome Measure: Areas under the receiver operating curves (AUC) for AMH-based and FSH-based predictions of time to FMP, stratified by age. Probabilities that women would undergo their FMP in the next 12, 24, or 36 months across a range of AMH values were assessed., Results: AUCs for predicting that the FMP will occur within the next 24 months were significantly greater for AMH-based than FSH-based models. The probability that a woman with an AMH <10 pg/mL would undergo her FMP within the next 12 months ranged from 51% at h<48 years of age to 79% at ≥51 years. The probability that a woman with an AMH >100 pg/mL would not undergo her FMP within the next 12 months ranged from 97% in women <48 years old to 90% in women ≥51 years old., Conclusions: AMH measurement helps estimate when a woman will undergo her FMP, and, in general, does so better than FSH., (© Endocrine Society 2020. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com.)