One Rep Max for 15 kg × 9 reps

One Rep Max Calculator
One Rep Max for
lifted for
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What is the one rep max for 15 kg × 9 reps?

Answer

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

A set of 9 reps at 15 kg 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 kg

Training Weights as a % of 1RM

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

% of 1RMWorking Weight
95%18.5 kg
90%17.6 kg
85%16.6 kg
80%15.6 kg
75%14.6 kg
70%13.7 kg
65%12.7 kg
60%11.7 kg

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 kg × 9 reps:

FormulaEstimated 1RM
Epley19.5 kg
Brzycki19.3 kg
Lombardi18.7 kg
O'Conner18.4 kg
Wathan19.8 kg
Lander19.4 kg
Mayhew19.3 kg

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 kg × 9 reps? (The answer is: 19.5 kg). 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 kg

RepsOne Rep Max% of 1RM
2 reps16 kg93.8%
3 reps16.5 kg90.9%
4 reps17 kg88.2%
5 reps17.5 kg85.7%
6 reps18 kg83.3%
7 reps18.5 kg81.1%
8 reps19 kg78.9%
9 reps19.5 kg76.9%
10 reps20 kg75%
11 reps20.5 kg73.2%
12 reps21 kg71.4%

FAQ

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

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

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

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

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

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

See Also