Free strength tool
Find your strongest
number.
Estimate your one-rep max from a recent set—without testing a true max or turning your training day into a gamble.
1RM calculator
Enter your best set
Your estimated 1RM
115 kg Likely range: 112–117 kgYour training map
Turn one number into a smarter session.
Use these rounded loads as a starting point. Your readiness, technique, and exercise selection still matter.
Plate setup for 92.5 kg
20 + 10 + 5 + 1.25 kg per side · 20 kg bar
Train with context
What your percentage is good for
Build skill & volume
Technique work, warm-up sets, and higher-rep training with room to recover.
Build strength
The productive middle for most working sets: heavy enough to drive progress, manageable enough to repeat.
Practise heavy lifts
Low-rep, high-intensity work. Use sparingly, with good technique and appropriate safety measures.
What is a one-rep max?
Your one-repetition maximum (1RM) is the heaviest load you can lift once with good form. It is commonly used to measure strength and prescribe training intensity.
This calculator averages the Epley, Brzycki, and Lander formulas. An estimate is most useful when it comes from a recent, demanding set below 10 reps. It is not a substitute for coaching or medical advice.