1RM calculator prototype

Bench press, back squat, deadlift — compares 8 published prediction equations against the confidence ratings from a 2026-07 literature scan. Built by Claude for Ben Onofrio's Physio-Research / SSS calculator spec — not a validated clinical tool.

Interactive one rep max calculator comparing eight published prediction equations across bench press, back squat and deadlift, with evidence based confidence ratings by exercise and sex

Sources: Whisenant et al. (2003) J Strength Cond Res 17(2):221–227. Mayhew et al. (2008) J Strength Cond Res 22(5):1570–1577. LeSuer et al. (1997) J Strength Cond Res 11(4):211–213. Reynolds, Gordon & Robergs (2006) J Strength Cond Res 20(3):584–592. Ribeiro et al. (2024) Int J Strength Cond 4(1). DiStasio (2014) master's research paper, Southern Illinois University Carbondale — unreviewed, lower confidence. Full write-up: 1RM_Equation_Validity_External_Literature_Scan_2026-07.md.