This calculator utilizes a combination of popular formulas including Brzycki, Epley, Lombardi, Mayhew et al. and Wathan, the calculator calculates the estimated 1RM by averaging the results from these formulas to make it as precise and as error-free as possible.
SPOILER: it will not be 100% precise because your performance will depend on many factors but on low reps (less than 5) this calculator gives a pretty good estimate of what your 1RM is, meanwhile for high reps (10+) it will be pretty inaccurate and will overestimate your 1RM.
1RM Calculator
Your 1RM, or One-Repetition Maximum, is a powerful tool for planning your strength trainings. Once you know your 1RM for a specific exercise, like the bench press, squat or an accessory like leg press, you can use it to set load goals and track your improvement over time.
Let’s see how it works, if your current 1RM for the bench press is 100 kilograms. Instead of always lifting that maximum weight, you can use a percentage of it to plan your workouts, for instance, you can start with 70% of your 1RM, which would be 70 kilograms, then you can gradually increase the weight lifted to 75%, 80% and so on until you try doing an AMRAP or just test your 1RM again.
By regularly reassessing your 1RM and adjusting your training accordingly, you can ensure that you’re always challenging yourself and making progress towards your fitness and strength goals.