One Rep Max for 420 lbs × 9 reps
One Rep Max Calculator
What is the one rep max for 420 lbs × 9 reps?
Answer
Lifting 420 lbs for 9 reps gives an estimated one rep max of
546 lbs
A set of 9 reps at 420 lbs is
76.9%
of your estimated one rep max
Note: this is an estimate, not a tested max. Rep-based formulas are closest at 2–6 reps and drift further apart as the set gets longer. Warm up and use a spotter before attempting a true single.
How to Calculate One Rep Max
Epley Formula: 1RM = weight × (1 + reps ÷ 30)
The Epley formula assumes that every extra repetition you can complete corresponds to roughly 3.33% more weight on the bar. Put your set into it:
420 × (1 + 9 ÷ 30)
=420 × 1.3
=546 lbs
Training Weights as a % of 1RM
Percentages of your estimated max of 546 lbs, the way most strength programmes prescribe load:
| % of 1RM | Working Weight |
|---|---|
| 95% | 518.7 lbs |
| 90% | 491.4 lbs |
| 85% | 464.1 lbs |
| 80% | 436.8 lbs |
| 75% | 409.5 lbs |
| 70% | 382.2 lbs |
| 65% | 354.9 lbs |
| 60% | 327.6 lbs |
Other One Rep Max Formulas
Published 1RM formulas disagree, and the gap widens with the rep count. This page answers with Epley; here is what the others give for 420 lbs × 9 reps:
| Formula | Estimated 1RM |
|---|---|
| Epley | 546 lbs |
| Brzycki | 540 lbs |
| Lombardi | 523.2 lbs |
| O'Conner | 514.5 lbs |
| Wathan | 553.5 lbs |
| Lander | 543.6 lbs |
| Mayhew | 540.3 lbs |
Related Calculations
See Also
- BMI Meaning - Check what given BMI means
- BMI Calculator (Imperial) - Body Mass Index Calculator (ft/in/lbs)
- BMI Calculator (Metric) - Body Mass Index Calculator (kg/cm)
- Ideal Weight Calculator (Imperial) - Find out the Ideal Weight for a given Height in feet/inches
- Ideal Weight Calculator (Metric) - Find out the Ideal Weight for a given Height in centimeters
One Rep Max Calculator
This calculator estimates your one-rep max (1RM) — the heaviest weight you could lift for a single repetition — from a set you have already completed. For example, it can help you find out what is the one rep max for 420 lbs × 9 reps? (The answer is: 546 lbs). Enter the weight you lifted (e.g. 420), pick pounds or kilograms, and enter how many reps you managed (e.g. 9).
One Rep Max Calculator
One Rep Max Table for 420 lbs
FAQ
What is the one rep max for 420 lbs × 9 reps?
Lifting 420 lbs for 9 reps gives an estimated one rep max of 546 lbs
How much of my max is 420 lbs for 9 reps?
420 lbs for 9 reps works out at 76.9% of an estimated one rep max of 546 lbs.
What should I lift at 90% and 70% of that max?
90% of 546 lbs is 491.4 lbs and 70% is 382.2 lbs. Heavy strength work usually sits at 85–95%, while volume and technique work sits nearer 65–75%.
See Also
- What is my 1 rep max for 415 lbs × 10 reps?
- What is my 1 rep max for 415 lbs × 11 reps?
- What is my 1 rep max for 415 lbs × 12 reps?
- What is my 1 rep max for 420 lbs × 2 reps?
- What is my 1 rep max for 420 lbs × 3 reps?
- What is my 1 rep max for 420 lbs × 4 reps?
- What is my 1 rep max for 420 lbs × 5 reps?
- What is my 1 rep max for 420 lbs × 6 reps?
- What is my 1 rep max for 420 lbs × 7 reps?
- What is my 1 rep max for 420 lbs × 8 reps?
- What is my 1 rep max for 420 lbs × 10 reps?
- What is my 1 rep max for 420 lbs × 11 reps?
- What is my 1 rep max for 420 lbs × 12 reps?
- What is my 1 rep max for 425 lbs × 2 reps?
- What is my 1 rep max for 425 lbs × 3 reps?
- What is my 1 rep max for 425 lbs × 4 reps?
- What is my 1 rep max for 425 lbs × 5 reps?
- What is my 1 rep max for 425 lbs × 6 reps?
- What is my 1 rep max for 425 lbs × 7 reps?
- What is my 1 rep max for 425 lbs × 8 reps?
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