Your one-rep max (1RM) is the foundation of strength programming. Whether you're following 5/3/1, Texas Method, or any percentage-based program, you need an accurate 1RM estimate to set meaningful training weights.

Why Not Test a True 1RM Every Time?

A genuine max attempt places significant stress on the central nervous system, requires 3–5 days of recovery, and carries injury risk — particularly for newer lifters whose technique may break down at maximal loads. Testing from a submaximal set (3–5 reps at a challenging but not maximal weight) is far safer and produces results within 2–5% of your true max.

Choosing the Right Rep Range to Test From

For powerlifting-specific accuracy, perform a set of 3–5 reps at roughly 80–90% of your estimated max. Sets of 1–6 reps are best modeled by the Brzycki and Lander formulas. If you test with higher reps (6–10), switch to Mayhew or Wathan, which use exponential curves better suited to moderate-fatigue sets. Avoid estimating from sets of 12+ reps — the compounding fatigue error makes these predictions unreliable.

Conventional vs. Sumo: Does the Type Matter?

All three deadlift variants recruit the same primary movers (hamstrings, glutes, erectors), but with different emphases. The trap bar reduces lower-back moment arm and typically allows 5–10% more weight. Sumo may allow slightly more hip-dominant lifters to pull more. For program design purposes, treat each variant's 1RM independently — don't plug your trap bar 1RM into a conventional deadlift program.

From 1RM to Programming

Once you have your 1RM, set your Training Max at 90% (per Wendler's 5/3/1) and calculate all weekly percentages off that number. This conservative buffer is intentional: it keeps you from grinding excessively on day one and allows you to accumulate reps over time. Your true 1RM should rise as a byproduct of consistent training — not from frequent max testing.