One Rep Max for 15 lbs × 9 reps

One Rep Max Calculator
One Rep Max for
lifted for
reps

What is the one rep max for 15 lbs × 9 reps?

Answer

Lifting 15 lbs for 9 reps gives an estimated one rep max of
19.5 lbs

A set of 9 reps at 15 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:

15 × (1 + 9 ÷ 30)

=

15 × 1.3

=

19.5 lbs

Training Weights as a % of 1RM

Percentages of your estimated max of 19.5 lbs, the way most strength programmes prescribe load:

% of 1RMWorking Weight
95%18.5 lbs
90%17.6 lbs
85%16.6 lbs
80%15.6 lbs
75%14.6 lbs
70%13.7 lbs
65%12.7 lbs
60%11.7 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 15 lbs × 9 reps:

FormulaEstimated 1RM
Epley19.5 lbs
Brzycki19.3 lbs
Lombardi18.7 lbs
O'Conner18.4 lbs
Wathan19.8 lbs
Lander19.4 lbs
Mayhew19.3 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 15 lbs × 9 reps? (The answer is: 19.5 lbs). Enter the weight you lifted (e.g. 15), pick pounds or kilograms, and enter how many reps you managed (e.g. 9).
Recalculate with different values ↑

One Rep Max Table for 15 lbs

RepsOne Rep Max% of 1RM
2 reps16 lbs93.8%
3 reps16.5 lbs90.9%
4 reps17 lbs88.2%
5 reps17.5 lbs85.7%
6 reps18 lbs83.3%
7 reps18.5 lbs81.1%
8 reps19 lbs78.9%
9 reps19.5 lbs76.9%
10 reps20 lbs75%
11 reps20.5 lbs73.2%
12 reps21 lbs71.4%

FAQ

What is the one rep max for 15 lbs × 9 reps?

Lifting 15 lbs for 9 reps gives an estimated one rep max of 19.5 lbs

How much of my max is 15 lbs for 9 reps?

15 lbs for 9 reps works out at 76.9% of an estimated one rep max of 19.5 lbs.

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

90% of 19.5 lbs is 17.6 lbs and 70% is 13.7 lbs. Heavy strength work usually sits at 85–95%, while volume and technique work sits nearer 65–75%.

See Also