One Rep Max for 380 lbs × 4 reps

One Rep Max Calculator
One Rep Max for
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What is the one rep max for 380 lbs × 4 reps?

Answer

Lifting 380 lbs for 4 reps gives an estimated one rep max of
430.7 lbs

A set of 4 reps at 380 lbs is

88.2%

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 + 4 ÷ 30)

≈

380 × 1.1333

≈

430.7 lbs

Training Weights as a % of 1RM

Percentages of your estimated max of 430.7 lbs, the way most strength programmes prescribe load:

% of 1RMWorking Weight
95%409.1 lbs
90%387.6 lbs
85%366.1 lbs
80%344.5 lbs
75%323 lbs
70%301.5 lbs
65%279.9 lbs
60%258.4 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 380 lbs × 4 reps:

FormulaEstimated 1RM
Epley430.7 lbs
Brzycki414.5 lbs
Lombardi436.5 lbs
O'Conner418 lbs
Wathan430.8 lbs
Lander419.4 lbs
Mayhew442.8 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 × 4 reps? (The answer is: 430.7 lbs). Enter the weight you lifted (e.g. 380), pick pounds or kilograms, and enter how many reps you managed (e.g. 4).
Recalculate with different values ↑

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 × 4 reps?

Lifting 380 lbs for 4 reps gives an estimated one rep max of 430.7 lbs

How much of my max is 380 lbs for 4 reps?

380 lbs for 4 reps works out at 88.2% of an estimated one rep max of 430.7 lbs.

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

90% of 430.7 lbs is 387.6 lbs and 70% is 301.5 lbs. Heavy strength work usually sits at 85–95%, while volume and technique work sits nearer 65–75%.

See Also