Strength Tool
One Rep Max Calculator
Estimate your one-rep max from the weight you lifted and the number of reps completed. Useful for strength training, progressive overload and not guessing like a gym goblin.
Estimated Result
Your One Rep Max
Estimated 1RM
117 kg
Based on 100kg x 5 reps.
Training Percentages
95%
111 kg
90%
105 kg
85%
99 kg
80%
94 kg
75%
88 kg
70%
82 kg
Training Note
Your one rep max is an estimate.
Use this number as a guide, not a dare. Strength improves best when you train consistently, recover properly and increase load gradually.
Strength Training
Use your estimated max to train smarter.
A one rep max calculator estimates the heaviest weight you could lift for one repetition. It is useful for planning strength work, choosing training percentages and tracking progress over time. For safety, avoid testing true maxes too often. Estimated maxes are usually enough for smart training.