One Rep Max for 15 lbs × 6 reps

One Rep Max Calculator
One Rep Max for
lifted for
reps

What is the one rep max for 15 lbs × 6 reps?

Answer

Lifting 15 lbs for 6 reps gives an estimated one rep max of
18 lbs

A set of 6 reps at 15 lbs is

83.3%

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 + 6 ÷ 30)

=

15 × 1.2

=

18 lbs

Training Weights as a % of 1RM

Percentages of your estimated max of 18 lbs, the way most strength programmes prescribe load:

% of 1RMWorking Weight
95%17.1 lbs
90%16.2 lbs
85%15.3 lbs
80%14.4 lbs
75%13.5 lbs
70%12.6 lbs
65%11.7 lbs
60%10.8 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 × 6 reps:

FormulaEstimated 1RM
Epley18 lbs
Brzycki17.4 lbs
Lombardi17.9 lbs
O'Conner17.3 lbs
Wathan18.1 lbs
Lander17.6 lbs
Mayhew18.2 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 × 6 reps? (The answer is: 18 lbs). Enter the weight you lifted (e.g. 15), pick pounds or kilograms, and enter how many reps you managed (e.g. 6).
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 × 6 reps?

Lifting 15 lbs for 6 reps gives an estimated one rep max of 18 lbs

How much of my max is 15 lbs for 6 reps?

15 lbs for 6 reps works out at 83.3% of an estimated one rep max of 18 lbs.

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

90% of 18 lbs is 16.2 lbs and 70% is 12.6 lbs. Heavy strength work usually sits at 85–95%, while volume and technique work sits nearer 65–75%.

See Also