One Rep Max for 15 kg × 4 reps

One Rep Max Calculator
One Rep Max for
lifted for
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What is the one rep max for 15 kg × 4 reps?

Answer

Lifting 15 kg for 4 reps gives an estimated one rep max of
17 kg

A set of 4 reps at 15 kg is

88.2%

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 + 4 ÷ 30)

≈

15 × 1.1333

≈

17 kg

Training Weights as a % of 1RM

Percentages of your estimated max of 17 kg, the way most strength programmes prescribe load:

% of 1RMWorking Weight
95%16.2 kg
90%15.3 kg
85%14.5 kg
80%13.6 kg
75%12.8 kg
70%11.9 kg
65%11.1 kg
60%10.2 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 × 4 reps:

FormulaEstimated 1RM
Epley17 kg
Brzycki16.4 kg
Lombardi17.2 kg
O'Conner16.5 kg
Wathan17 kg
Lander16.6 kg
Mayhew17.5 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 × 4 reps? (The answer is: 17 kg). Enter the weight you lifted (e.g. 15), pick pounds or kilograms, and enter how many reps you managed (e.g. 4).
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 × 4 reps?

Lifting 15 kg for 4 reps gives an estimated one rep max of 17 kg

How much of my max is 15 kg for 4 reps?

15 kg for 4 reps works out at 88.2% of an estimated one rep max of 17 kg.

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

90% of 17 kg is 15.3 kg and 70% is 11.9 kg. Heavy strength work usually sits at 85–95%, while volume and technique work sits nearer 65–75%.

See Also