One Rep Max for 40 lbs × 9 reps

One Rep Max Calculator
One Rep Max for
lifted for
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What is the one rep max for 40 lbs × 9 reps?

Answer

Lifting 40 lbs for 9 reps gives an estimated one rep max of
52 lbs

A set of 9 reps at 40 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:

40 × (1 + 9 ÷ 30)

=

40 × 1.3

=

52 lbs

Training Weights as a % of 1RM

Percentages of your estimated max of 52 lbs, the way most strength programmes prescribe load:

% of 1RMWorking Weight
95%49.4 lbs
90%46.8 lbs
85%44.2 lbs
80%41.6 lbs
75%39 lbs
70%36.4 lbs
65%33.8 lbs
60%31.2 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 40 lbs × 9 reps:

FormulaEstimated 1RM
Epley52 lbs
Brzycki51.4 lbs
Lombardi49.8 lbs
O'Conner49 lbs
Wathan52.7 lbs
Lander51.8 lbs
Mayhew51.5 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 40 lbs × 9 reps? (The answer is: 52 lbs). Enter the weight you lifted (e.g. 40), pick pounds or kilograms, and enter how many reps you managed (e.g. 9).
Recalculate with different values ↑

One Rep Max Table for 40 lbs

RepsOne Rep Max% of 1RM
2 reps42.7 lbs93.8%
3 reps44 lbs90.9%
4 reps45.3 lbs88.2%
5 reps46.7 lbs85.7%
6 reps48 lbs83.3%
7 reps49.3 lbs81.1%
8 reps50.7 lbs78.9%
9 reps52 lbs76.9%
10 reps53.3 lbs75%
11 reps54.7 lbs73.2%
12 reps56 lbs71.4%

FAQ

What is the one rep max for 40 lbs × 9 reps?

Lifting 40 lbs for 9 reps gives an estimated one rep max of 52 lbs

How much of my max is 40 lbs for 9 reps?

40 lbs for 9 reps works out at 76.9% of an estimated one rep max of 52 lbs.

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

90% of 52 lbs is 46.8 lbs and 70% is 36.4 lbs. Heavy strength work usually sits at 85–95%, while volume and technique work sits nearer 65–75%.

See Also