How to Use Your 1RM to Build a Smarter Training Plan

What Is a 1 Rep Max?

Your one-repetition maximum (1RM) is the maximum weight you can lift for a single complete repetition of an exercise with correct form. It is the universal benchmark in strength sports and the foundation of structured programming.

You do not need to actually attempt a maximal lift to know your 1RM. Submaximal estimates — lifting a manageable weight for multiple reps — are safer and sufficiently accurate for programming purposes.

The Most Common Estimation Formulas

Three equations are widely used to estimate 1RM from a submaximal effort:

Epley: 1RM = weight × (1 + reps / 30) Brzycki: 1RM = weight × 36 / (37 − reps) Lander: 1RM = (100 × weight) / (101.3 − 2.67123 × reps)

All three are most accurate for sets of 1–10 reps. Beyond 10 reps, accuracy degrades significantly. Our 1RM Calculator uses all three and displays the average alongside each individual result.

Percentage-Based Programming: The Core Principle

Once you know your 1RM, every working set can be prescribed as a percentage. This eliminates arbitrary weight selection and ensures appropriate stimulus across different rep ranges.

55–65% 1RM → High rep endurance work (12–20 reps) 65–75% 1RM → Hypertrophy range (8–12 reps) 75–85% 1RM → Strength/hypertrophy overlap (5–8 reps) 85–95% 1RM → Strength development (1–5 reps) 95–100% 1RM → Maximum strength / competition attempts

Practical Programming Example

Suppose your estimated 1RM on the squat is 120 kg. A simple 4-week strength block might look like:

Week 1: 4 × 6 at 75% → 4 sets of 6 reps at 90 kg
Week 2: 4 × 5 at 80% → 4 sets of 5 reps at 96 kg
Week 3: 4 × 4 at 85% → 4 sets of 4 reps at 102 kg
Week 4: Deload — 3 × 5 at 60% → recovery week at 72 kg

This linear progression naturally increases intensity week over week while managing cumulative fatigue with a deload.

How Often to Retest Your 1RM

After each training block (typically 4–8 weeks), your 1RM will have increased. Update your baseline by either re-testing with a submaximal effort or performing a true max attempt at the end of a peaking block. Most intermediate lifters will see their estimated 1RM increase by 2.5–5 kg per month on the main compound lifts.

Which Exercises to 1RM Test

Percentage-based programming works best for compound movements with a large strength expression: squat, bench press, deadlift, overhead press, and barbell row. Isolation exercises and machine movements are generally programmed by feel (RPE) rather than 1RM percentages.

Calculate now: Use our 1RM Calculator — enter a weight you can lift for multiple reps and get your estimated one-rep max across all three formulas instantly.