One Rep Max for 20 lbs × 7 reps

One Rep Max Calculator
One Rep Max for
lifted for
reps

What is the one rep max for 20 lbs × 7 reps?

Answer

Lifting 20 lbs for 7 reps gives an estimated one rep max of
24.7 lbs

A set of 7 reps at 20 lbs is

81.1%

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:

20 × (1 + 7 ÷ 30)

≈

20 × 1.2333

≈

24.7 lbs

Training Weights as a % of 1RM

Percentages of your estimated max of 24.7 lbs, the way most strength programmes prescribe load:

% of 1RMWorking Weight
95%23.4 lbs
90%22.2 lbs
85%21 lbs
80%19.7 lbs
75%18.5 lbs
70%17.3 lbs
65%16 lbs
60%14.8 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 20 lbs × 7 reps:

FormulaEstimated 1RM
Epley24.7 lbs
Brzycki24 lbs
Lombardi24.3 lbs
O'Conner23.5 lbs
Wathan24.9 lbs
Lander24.2 lbs
Mayhew24.8 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 20 lbs × 7 reps? (The answer is: 24.7 lbs). Enter the weight you lifted (e.g. 20), pick pounds or kilograms, and enter how many reps you managed (e.g. 7).
Recalculate with different values ↑

One Rep Max Table for 20 lbs

RepsOne Rep Max% of 1RM
2 reps21.3 lbs93.8%
3 reps22 lbs90.9%
4 reps22.7 lbs88.2%
5 reps23.3 lbs85.7%
6 reps24 lbs83.3%
7 reps24.7 lbs81.1%
8 reps25.3 lbs78.9%
9 reps26 lbs76.9%
10 reps26.7 lbs75%
11 reps27.3 lbs73.2%
12 reps28 lbs71.4%

FAQ

What is the one rep max for 20 lbs × 7 reps?

Lifting 20 lbs for 7 reps gives an estimated one rep max of 24.7 lbs

How much of my max is 20 lbs for 7 reps?

20 lbs for 7 reps works out at 81.1% of an estimated one rep max of 24.7 lbs.

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

90% of 24.7 lbs is 22.2 lbs and 70% is 17.3 lbs. Heavy strength work usually sits at 85–95%, while volume and technique work sits nearer 65–75%.

See Also