One Rep Max for 380 lbs × 12 reps

One Rep Max Calculator

One Rep Max for

lifted for

reps

What is the one rep max for 380 lbs × 12 reps?

Answer

Lifting 380 lbs for 12 reps gives an estimated one rep max of
532 lbs

A set of 12 reps at 380 lbs is

71.4%

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:

380 × (1 + 12 ÷ 30)

=

380 × 1.4

=

532 lbs

Training Weights as a % of 1RM

Percentages of your estimated max of 532 lbs, the way most strength programmes prescribe load:

% of 1RMWorking Weight
95%505.4 lbs
90%478.8 lbs
85%452.2 lbs
80%425.6 lbs
75%399 lbs
70%372.4 lbs
65%345.8 lbs
60%319.2 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 380 lbs × 12 reps:

FormulaEstimated 1RM
Epley532 lbs
Brzycki547.2 lbs
Lombardi487.2 lbs
O'Conner494 lbs
Wathan539.5 lbs
Lander548.8 lbs
Mayhew514.5 lbs

Related Calculations

See Also

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 380 lbs × 12 reps? (The answer is: 532 lbs). Enter the weight you lifted (e.g. 380), pick pounds or kilograms, and enter how many reps you managed (e.g. 12).

One Rep Max Calculator

One Rep Max for

lifted for

reps

One Rep Max Table for 380 lbs

RepsOne Rep Max% of 1RM
2 reps405.3 lbs93.8%
3 reps418 lbs90.9%
4 reps430.7 lbs88.2%
5 reps443.3 lbs85.7%
6 reps456 lbs83.3%
7 reps468.7 lbs81.1%
8 reps481.3 lbs78.9%
9 reps494 lbs76.9%
10 reps506.7 lbs75%
11 reps519.3 lbs73.2%
12 reps532 lbs71.4%

FAQ

What is the one rep max for 380 lbs × 12 reps?

Lifting 380 lbs for 12 reps gives an estimated one rep max of 532 lbs

How much of my max is 380 lbs for 12 reps?

380 lbs for 12 reps works out at 71.4% of an estimated one rep max of 532 lbs.

What should I lift at 90% and 70% of that max?

90% of 532 lbs is 478.8 lbs and 70% is 372.4 lbs. Heavy strength work usually sits at 85–95%, while volume and technique work sits nearer 65–75%.

See Also