Using the Epley formula, estimate 1RM for 100 kg lifted 5 reps.

Using the Epley formula, estimate 1RM for 100 kg lifted 5 reps.

• A. 117 kg
• B. 112 kg
• C. 125 kg
• D. 130 kg

Answer: (A)

The Epley formula estimates a one-repetition max from the load and reps: 1RM = weight × (1 + reps/30). With 100 kg and 5 reps, compute 1RM = 100 × (1 + 5/30) = 100 × 1.1667 ≈ 116.7 kg, which rounds to about 117 kg. This fits the idea that lifting 100 kg for five reps corresponds to roughly 83% of a true max, and the Epley multiplier of 1.1667 reflects that relationship. The other numbers don’t align with this calculation for these inputs, so 117 kg is the best estimate.

The Epley formula estimates a one-repetition max from the load and reps: 1RM = weight × (1 + reps/30). With 100 kg and 5 reps, compute 1RM = 100 × (1 + 5/30) = 100 × 1.1667 ≈ 116.7 kg, which rounds to about 117 kg. This fits the idea that lifting 100 kg for five reps corresponds to roughly 83% of a true max, and the Epley multiplier of 1.1667 reflects that relationship. The other numbers don’t align with this calculation for these inputs, so 117 kg is the best estimate.