1RM Calculator — One Rep Max EstimatorEstimate your one-rep max (1RM) from submaximal lifts using scientifically validated formulas.Supported Formulas

Epley — 1RM = w × (1 + r/30). Most widely used formula.

Brzycki — 1RM = w / (1.0278 − 0.0278 × r). Conservative, data-driven.

Lander — 1RM = (100 × w) / (101.3 − 2.67123 × r).

Lombardi — 1RM = w × r^0.10.

Mayhew et al. — 1RM = (100 × w) / (52.2 + 41.9 × e^(−0.055 × r)).

O'Conner et al. — 1RM = w × (1 + 0.025 × r).

Wathan — 1RM = (100 × w) / (48.8 + 53.8 × e^(−0.075 × r)).

Best accuracy at 1–10 reps. For reps above 10, estimates become less reliable.Training Percentage ChartUse your estimated 1RM to plan training loads: 95% (2 reps), 90% (4 reps), 85% (6 reps), 80% (8 reps), 75% (10 reps), 70% (12 reps), 65% (15 reps), 60% (20 reps).Visit Calipath for structured calisthenics progression maps.