One Rep Max for 255 lbs × 9 reps

One Rep Max Calculator
One Rep Max for
lifted for
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What is the one rep max for 255 lbs × 9 reps?

Answer

Lifting 255 lbs for 9 reps gives an estimated one rep max of
331.5 lbs

A set of 9 reps at 255 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:

255 × (1 + 9 ÷ 30)

=

255 × 1.3

=

331.5 lbs

Training Weights as a % of 1RM

Percentages of your estimated max of 331.5 lbs, the way most strength programmes prescribe load:

% of 1RMWorking Weight
95%314.9 lbs
90%298.4 lbs
85%281.8 lbs
80%265.2 lbs
75%248.6 lbs
70%232.1 lbs
65%215.5 lbs
60%198.9 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 255 lbs × 9 reps:

FormulaEstimated 1RM
Epley331.5 lbs
Brzycki327.9 lbs
Lombardi317.7 lbs
O'Conner312.4 lbs
Wathan336 lbs
Lander330.1 lbs
Mayhew328 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 255 lbs × 9 reps? (The answer is: 331.5 lbs). Enter the weight you lifted (e.g. 255), pick pounds or kilograms, and enter how many reps you managed (e.g. 9).
Recalculate with different values ↑

One Rep Max Table for 255 lbs

RepsOne Rep Max% of 1RM
2 reps272 lbs93.8%
3 reps280.5 lbs90.9%
4 reps289 lbs88.2%
5 reps297.5 lbs85.7%
6 reps306 lbs83.3%
7 reps314.5 lbs81.1%
8 reps323 lbs78.9%
9 reps331.5 lbs76.9%
10 reps340 lbs75%
11 reps348.5 lbs73.2%
12 reps357 lbs71.4%

FAQ

What is the one rep max for 255 lbs × 9 reps?

Lifting 255 lbs for 9 reps gives an estimated one rep max of 331.5 lbs

How much of my max is 255 lbs for 9 reps?

255 lbs for 9 reps works out at 76.9% of an estimated one rep max of 331.5 lbs.

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

90% of 331.5 lbs is 298.4 lbs and 70% is 232.1 lbs. Heavy strength work usually sits at 85–95%, while volume and technique work sits nearer 65–75%.

See Also