How is 1RM typically determined according to the specified formula?

• A. (Load x reps x .033) + load
• B. (Load x reps) / 2
• C. 1RM equals load for a single rep
• D. (Load x reps x .05) + load

Answer: (A)

Think of 1RM as a best-guess projection of the heaviest weight you could lift for one repetition based on a lighter, submaximal set. The formula shown uses the weight you actually lifted (the load) and the number of reps you performed with that load, then adds a small increment for each rep. The increment is load × reps × 0.033, which is the same as load × (1 + reps/30). This reflects the idea that each additional rep with that weight suggests a higher single‑repetition maximum, but the increase is moderated to keep the estimate realistic. So the estimated 1RM becomes load plus that extra amount, i.e., load + (load × reps × 0.033).

This is why that option is the best fit for the described formula: it directly combines the actual load and the number of reps with a fixed multiplier to project the maximum single lift. The other forms don’t follow this same simple extrapolation pattern, and one option would describe an actual true 1RM rather than its estimation.