One Rep Max for 105 lbs × 4 reps

One Rep Max Calculator

One Rep Max for

lifted for

reps

What is the one rep max for 105 lbs × 4 reps?

Answer

Lifting 105 lbs for 4 reps gives an estimated one rep max of
119 lbs

A set of 4 reps at 105 lbs 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:

105 × (1 + 4 ÷ 30)

=

105 × 1.1333

=

119 lbs

Training Weights as a % of 1RM

Percentages of your estimated max of 119 lbs, the way most strength programmes prescribe load:

% of 1RMWorking Weight
95%113.1 lbs
90%107.1 lbs
85%101.2 lbs
80%95.2 lbs
75%89.3 lbs
70%83.3 lbs
65%77.4 lbs
60%71.4 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 105 lbs × 4 reps:

FormulaEstimated 1RM
Epley119 lbs
Brzycki114.5 lbs
Lombardi120.6 lbs
O'Conner115.5 lbs
Wathan119 lbs
Lander115.9 lbs
Mayhew122.3 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 105 lbs × 4 reps? (The answer is: 119 lbs). Enter the weight you lifted (e.g. 105), pick pounds or kilograms, and enter how many reps you managed (e.g. 4).

One Rep Max Calculator

One Rep Max for

lifted for

reps

One Rep Max Table for 105 lbs

RepsOne Rep Max% of 1RM
2 reps112 lbs93.8%
3 reps115.5 lbs90.9%
4 reps119 lbs88.2%
5 reps122.5 lbs85.7%
6 reps126 lbs83.3%
7 reps129.5 lbs81.1%
8 reps133 lbs78.9%
9 reps136.5 lbs76.9%
10 reps140 lbs75%
11 reps143.5 lbs73.2%
12 reps147 lbs71.4%

FAQ

What is the one rep max for 105 lbs × 4 reps?

Lifting 105 lbs for 4 reps gives an estimated one rep max of 119 lbs

How much of my max is 105 lbs for 4 reps?

105 lbs for 4 reps works out at 88.2% of an estimated one rep max of 119 lbs.

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

90% of 119 lbs is 107.1 lbs and 70% is 83.3 lbs. Heavy strength work usually sits at 85–95%, while volume and technique work sits nearer 65–75%.

See Also