One Rep Max for 400 lbs × 12 reps

One Rep Max Calculator

One Rep Max for

lifted for

reps

What is the one rep max for 400 lbs × 12 reps?

Answer

Lifting 400 lbs for 12 reps gives an estimated one rep max of
560 lbs

A set of 12 reps at 400 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:

400 × (1 + 12 ÷ 30)

=

400 × 1.4

=

560 lbs

Training Weights as a % of 1RM

Percentages of your estimated max of 560 lbs, the way most strength programmes prescribe load:

% of 1RMWorking Weight
95%532 lbs
90%504 lbs
85%476 lbs
80%448 lbs
75%420 lbs
70%392 lbs
65%364 lbs
60%336 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 400 lbs × 12 reps:

FormulaEstimated 1RM
Epley560 lbs
Brzycki576 lbs
Lombardi512.8 lbs
O'Conner520 lbs
Wathan567.9 lbs
Lander577.7 lbs
Mayhew541.6 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 400 lbs × 12 reps? (The answer is: 560 lbs). Enter the weight you lifted (e.g. 400), 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 400 lbs

RepsOne Rep Max% of 1RM
2 reps426.7 lbs93.8%
3 reps440 lbs90.9%
4 reps453.3 lbs88.2%
5 reps466.7 lbs85.7%
6 reps480 lbs83.3%
7 reps493.3 lbs81.1%
8 reps506.7 lbs78.9%
9 reps520 lbs76.9%
10 reps533.3 lbs75%
11 reps546.7 lbs73.2%
12 reps560 lbs71.4%

FAQ

What is the one rep max for 400 lbs × 12 reps?

Lifting 400 lbs for 12 reps gives an estimated one rep max of 560 lbs

How much of my max is 400 lbs for 12 reps?

400 lbs for 12 reps works out at 71.4% of an estimated one rep max of 560 lbs.

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

90% of 560 lbs is 504 lbs and 70% is 392 lbs. Heavy strength work usually sits at 85–95%, while volume and technique work sits nearer 65–75%.

See Also