Compare calculators
Both calculators run independently β change the inputs on either side to compare results.
Hypertrophy Rep Range Calculator
Find the ideal rep range for muscle growth based on exercise type, target muscle, time under tension, and load. Use this when programming workouts to maximize hypertrophy for a specific muscle group.
Optimal Rep Range
6 reps
6-7 reps emphasizes mechanical tension on heavy compounds at ~75-85% 1RM; effective for hypertrophy with strength carryover but more joint and CNS load.
The output is clamped to literature-backed rep zones (roughly 6-20 reps) where mechanical tension and metabolic stress both drive growth (Schoenfeld).
Muscle Fiber Training Calculator
Determine how many of your weekly training sets should target fast-twitch muscle fibers based on your individual fiber composition. Use this when designing a strength or power-focused program tailored to your muscle biology.
Key differences
| Hypertrophy Rep Range Calculator | Muscle Fiber Training Calculator | |
|---|---|---|
| Category | Muscle Building | Muscle Building |
| Inputs required | 4 | 2 |
| Result | Optimal Rep Range (reps) | Heavy Training Sets (sets) |
| What it does | Find the ideal rep range for muscle growth based on exercise type, target muscle, time under tension, and load. Use this when programming workouts to maximize hypertrophy for a specific muscle group. | Determine how many of your weekly training sets should target fast-twitch muscle fibers based on your individual fiber composition. Use this when designing a strength or power-focused program tailored to your muscle biology. |