1RM Calculator
Enter the weight you lifted and your rep count — instantly calculate your one rep max through 5RM.
kg
1 – 500 kg
reps
1 – 15 reps
Results
| Target | Weight | % of 1RM |
|---|
Formula: Wathan — 1RM = (100 × W) / (48.8 + 53.8 × e−0.075 × R)
VIGOR App
Track your 1RM automatically with every workout
VIGOR uses the Wathan formula to calculate your 1RM automatically from your logged sets and reps. Track weekly strength progress with graphs — core tracking free for life.
Core tracking free for life · No sign-up required