Although well known for its organic waste decomposing capability, much of the biology of Hermetia illucens (L.) (Diptera: Stratiomyidae) remains unknown, including details involving its diapause. The present study provides a better understanding of the effects of diapause on the fecundity and longevity of H. illucens. The daily degradation rates (dry weight of the uneaten residue) of a H. illucens cohort were also evaluated. Data were collected and analyzed based on the age-stage, two-sex life table. The intrinsic rate of increase (r), finite rate of increase (λ), net reproduction rate (R₀), and mean generation time (T) were 0.0498 (d⁻¹), 1.0511 (d⁻¹), 118.3 offspring, and 95.8 d, respectively. The maximum net maternity was 22.5 eggs after 88 d. Only 12 females out of 22 were able to successfully oviposit. The number of eggs produced per female ranged from 508 to 1,047. Degradation and consumption occurred during each of the 23 d until all larvae developed into the prepupal stage. The age-stage net consumption rate (B_xj) dropped at day 11 (1.05 mg) and then reached its highest level at day 14 (1.72 mg). The mean degradation rate was 26.69 mg and the total degradation and consumption was 1,921.52 mg. Linking life table data and degradation rates provides the necessary data for predicting a population's growth and its degradation capacity. Results of this study demonstrated the importance of adding moisture during the prepupal stage. This information will provide a better understanding for an implementation program using H. illucens as a biodegrading agent of organic waste matter.