What 1RM and 5RM mean
1RM is the maximum load you can perform for 1 rep. 5RM is the maximum load you can perform for 5 reps. This tool estimates those from sets you’ve already done.
1RM & 5RM Calculator
Enter any 2–3 rep max points (1–20 reps). We fit your curve and estimate your full 1–20 rep max profile.
How this calculator works
Add 2–3 “rep max points” from recent sets. We fit your personal load–rep curve and estimate your 1–20 rep max profile.
Standard lifts vs weighted calisthenics
Use Standard lifts & machines for barbells, dumbbells, cables, and machines. Use Weighted calisthenics exercises for weighted pull-ups, chin-ups, and dips.
Standard: Enter the actual lifted load
Weighted calisthenics: Enter added load + bodyweight separately
What is a “rep max point”?
A rep max point is one heavy set written as “reps × load”. Use sets taken close to failure (about 0–3 reps in reserve).
Examples: 5 reps × 80 kg
10 reps × 65 kg
Why 2–3 points is better than 1
- One set can be noisy (fatigue, technique, bad day).
- Two or three sets let us fit your curve more reliably.
- Best accuracy comes from different rep ranges (e.g. 3–5 and 8–12).
Dynamic confidence
Confidence is based on your actual data quality — including whether you included lower reps, how spread your rep points are, and how closely the different points agree with each other.
Tips for the most accurate results
- Use sets done within the last 2–4 weeks.
- Use good form and consistent range of motion.
- Avoid partial reps or assisted reps unless that’s how you train every time.
- For weighted calisthenics, enter the added load — not total system load.
Quick workflow
Choose mode
Set kg/lb
Add 2–3 points
Learn curve
Use 1–20RM outputs
If your predicted numbers look unrealistic, re-check your units, whether your sets were near failure, and whether your rep points cover more than one rep zone.
Mini FAQ
Does this work for cables and machines?
Yes. It works best when you stay consistent with the same setup, machine, range of motion, and technique. Cable results are most useful as a performance reference for that exact setup.
How does weighted calisthenics mode work?
Internally, we calculate using total system load (bodyweight + added load). Then we convert the result back into added weight for display, which is what most people care about in practice.
Can estimated 1RM ever be below a weight I actually lifted?
No. This calculator now enforces that your estimated 1RM cannot be lower than the highest valid load you actually completed.
What rep ranges give the best estimate?
The most reliable results usually come from including at least one lower-rep set and one moderate-rep set. Example: 3–5 reps plus 8–12 reps.
Have more questions? Visit the full FAQs.