One Rep Max for 315 lbs × 8 reps
One Rep Max Calculator
What is the one rep max for 315 lbs × 8 reps?
Answer
Lifting 315 lbs for 8 reps gives an estimated one rep max of
399 lbs
A set of 8 reps at 315 lbs is
78.9%
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:
315 × (1 + 8 ÷ 30)
≈315 × 1.2667
≈399 lbs
Training Weights as a % of 1RM
Percentages of your estimated max of 399 lbs, the way most strength programmes prescribe load:
| % of 1RM | Working Weight |
|---|---|
| 95% | 379.1 lbs |
| 90% | 359.1 lbs |
| 85% | 339.2 lbs |
| 80% | 319.2 lbs |
| 75% | 299.3 lbs |
| 70% | 279.3 lbs |
| 65% | 259.4 lbs |
| 60% | 239.4 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 315 lbs × 8 reps:
| Formula | Estimated 1RM |
|---|---|
| Epley | 399 lbs |
| Brzycki | 391 lbs |
| Lombardi | 387.8 lbs |
| O'Conner | 378 lbs |
| Wathan | 403.9 lbs |
| Lander | 394.1 lbs |
| Mayhew | 397.8 lbs |
Found an error in the calculation or the information?
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
Share This Calculation
Print
<a href="https://calculat.io/en/weight/one-rep-max/315--lb--8-reps">What is my 1 rep max for 315 lbs × 8 reps? - Calculatio</a>Facebook
Twitter
Telegram
WhatsApp
Viber
Email
One Rep Max Table for 315 lbs
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 315 lbs × 8 reps? (The answer is: 399 lbs). Enter the weight you lifted (e.g. 315), pick pounds or kilograms, and enter how many reps you managed (e.g. 8).