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The ability to accurately identify proximity to momentary failure during a set of resistance exercise might be important to maximise training adaptations. This study examined the association between perceptual fatigue and the accuracy of the estimated repetitions to failure (ERF). Twenty-seven males and eleven females performed sets of 10 repetitions at specific loads for the chest press and leg-press. Following the completion of 10 repetitions, participants rated their fatigue and ERF and then proceeded to concentric failure (actual repetitions to failure) to determine the ERF accuracy (i.e., error-ERF). Small correlations were found between perceptual fatigue and error-ERF for the chest-press (<i>r</i> = &#8722;0.26, <i>p</i> = 0.001) and the leg-press (<i>r</i> = &#8722;0.18, <i>p</i> = 0.013). For actual repetitions to failure and error-ERF, a strong correlation was found for the chest-press (<i>r</i> = 0.68, <i>p</i> &lt; 0.001) and a very strong correlation was foundfor the leg-press (<i>r</i> = 0.73, <i>p</i> &lt; 0.001). Moderate correlations were found between perceptual fatigue and actual repetitions to failure for the chest-press (<i>r</i> = &#8722;0.42, <i>p</i> &lt; 0.001) and leg-press (<i>r</i> = &#8722;0.40, <i>p</i> &lt; 0.001). Overall, findings suggest that the accuracy of the estimated repetitions to failure is more strongly associated with proximity to task repetition failure rather than subjective feelings of fatigue.