Estimate and track 1RM to make overload decisions objectively

You can’t manage what you don’t measure — tracking your estimated 1RM gives you a single number that summarizes your current strength level.

Why it works

Working weight and rep count alone do not tell you whether you are progressing. A 3-rep max increase at the same weight as a 6-rep max performed last month represents the same adaptation — the 1RM estimate captures both. Estimated 1RM (from sets of 3–8 reps using Epley or Brzycki formula) is an accurate proxy that allows overload decisions to be made from a single comparable number rather than comparing dissimilar set-rep combinations.

How to do it

1. After each main compound lift, note the heaviest set’s weight and reps.
2. Apply the Epley formula: 1RM ≈ weight × (1 + reps / 30).
3. Track this number over weeks and plot the trend.
4. Test a true 1RM no more than once per training block to verify the estimate accuracy.

Evidence

Estimated 1RM formulas (Epley, Brzycki) are validated against direct 1RM testing and show acceptable accuracy for reps of 3–10. Single-rep testing carries injury risk; estimation is the safer and more practical tool. (observational)

Estimation accuracy declines at higher rep counts (above 10) and varies by individual and exercise; it is a useful trend indicator, not a precise measurement.

Sources

• Mayhew et al. (1995), accuracy of prediction equations for estimating 1-RM performance, Journal of Strength and Conditioning Research

Common mistake

Comparing sets with different rep counts and not knowing whether you’re stronger or just performing more volume — the 1RM estimate collapses both into a single comparable number.