One Rep Max for 100 lbs × 12 reps

One Rep Max Calculator

One Rep Max for

lifted for

reps

What is the one rep max for 100 lbs × 12 reps?

Answer

Lifting 100 lbs for 12 reps gives an estimated one rep max of
140 lbs

A set of 12 reps at 100 lbs is

71.4%

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:

100 × (1 + 12 ÷ 30)

=

100 × 1.4

=

140 lbs

Training Weights as a % of 1RM

Percentages of your estimated max of 140 lbs, the way most strength programmes prescribe load:

% of 1RMWorking Weight
95%133 lbs
90%126 lbs
85%119 lbs
80%112 lbs
75%105 lbs
70%98 lbs
65%91 lbs
60%84 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 100 lbs × 12 reps:

FormulaEstimated 1RM
Epley140 lbs
Brzycki144 lbs
Lombardi128.2 lbs
O'Conner130 lbs
Wathan142 lbs
Lander144.4 lbs
Mayhew135.4 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 100 lbs × 12 reps? (The answer is: 140 lbs). Enter the weight you lifted (e.g. 100), pick pounds or kilograms, and enter how many reps you managed (e.g. 12).

One Rep Max Calculator

One Rep Max for

lifted for

reps

One Rep Max Table for 100 lbs

RepsOne Rep Max% of 1RM
2 reps106.7 lbs93.8%
3 reps110 lbs90.9%
4 reps113.3 lbs88.2%
5 reps116.7 lbs85.7%
6 reps120 lbs83.3%
7 reps123.3 lbs81.1%
8 reps126.7 lbs78.9%
9 reps130 lbs76.9%
10 reps133.3 lbs75%
11 reps136.7 lbs73.2%
12 reps140 lbs71.4%

FAQ

What is the one rep max for 100 lbs × 12 reps?

Lifting 100 lbs for 12 reps gives an estimated one rep max of 140 lbs

How much of my max is 100 lbs for 12 reps?

100 lbs for 12 reps works out at 71.4% of an estimated one rep max of 140 lbs.

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

90% of 140 lbs is 126 lbs and 70% is 98 lbs. Heavy strength work usually sits at 85–95%, while volume and technique work sits nearer 65–75%.

See Also