Rep Max Calculator (Reps → 1RM)
Lifted 5×100 kg? See your estimated 1RM plus your predicted max for every rep count from 1 to 12 — perfect for programming percentage-based blocks.
Estimated 1RM
112.5
1 RM112.5
2 RM109.4
3 RM106.3
4 RM103.1
5 RM100
6 RM96.9
7 RM93.8
8 RM90.6
9 RM87.5
10 RM84.4
11 RM81.3
12 RM78.1
Formula
1RM = w × 36/(37 − reps) (Brzycki)How to use the Rep Max Calculator (Reps → 1RM)
- 1Enter weight lifted and reps completed
- 2See your estimated one-rep max
- 3Use the table to program sets at any rep target
Frequently Asked Questions
How accurate are estimates above 10 reps?
They degrade quickly — sets above 10 reps skew the result because muscular endurance dominates. For best accuracy use a 3–6 rep set.
What is my 5RM as a percentage of 1RM?
Roughly 87–90%. Common benchmark: 1×100%, 3×93%, 5×87%, 8×80%, 10×75%.