Best Performance
FAQ
How does the Fitbod Strength Tester work?
The Fitbod Strength Tester estimates your 1-rep max from your best set using the Brzycki formula, then compares it against 190M+ real workouts logged in Fitbod by lifters of similar age, weight, and gender. To use it: enter your age, body weight, gender, exercise, and your best set (reps × weight).
What is the Brzycki formula?
The Brzycki formula estimates your 1-rep max from a heavy set of multiple reps: 1RM = weight × 36 / (37 − reps). Developed by Matt Brzycki in 1993, it's typically accurate within 5 to 10% of a true tested 1RM for sets of 1 to 10 reps. The Strength Tester caps reps at 20, but for the most reliable result use your heaviest recent set in the 3 to 8 rep range.
What exercises are supported?
Back Squat, Barbell Bench Press, Barbell Hip Thrust, Barbell Shoulder Press, Deadlift, Dumbbell Bench Press, Hack Squat, Lat Pulldown, Leg Press, and Romanian Deadlift.
Is the Fitbod Strength Tester free?
Yes. The Strength Tester is a free web tool from Fitbod — no account or download required.
What is a good strength percentile?
Percentiles are relative to other Fitbod users of the same gender and similar age and body weight. The 50th percentile is average; 75th+ is strong; 90th+ is elite among logged lifters.
Why is my percentile lower than I expected?
Fitbod's data comes from people who actively log workouts, a more committed-than-average group than the general population. A 50th percentile here is stronger than a 50th percentile against casual lifters. If you're new to logging, intermediate percentiles often mean more than they look.