One Rep Max for 280 lbs × 8 reps

One Rep Max Calculator
One Rep Max for
lifted for
reps

What is the one rep max for 280 lbs × 8 reps?

Answer

Lifting 280 lbs for 8 reps gives an estimated one rep max of
354.7 lbs

A set of 8 reps at 280 lbs is

78.9%

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:

280 × (1 + 8 ÷ 30)

≈

280 × 1.2667

≈

354.7 lbs

Training Weights as a % of 1RM

Percentages of your estimated max of 354.7 lbs, the way most strength programmes prescribe load:

% of 1RMWorking Weight
95%336.9 lbs
90%319.2 lbs
85%301.5 lbs
80%283.7 lbs
75%266 lbs
70%248.3 lbs
65%230.5 lbs
60%212.8 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 280 lbs × 8 reps:

FormulaEstimated 1RM
Epley354.7 lbs
Brzycki347.6 lbs
Lombardi344.7 lbs
O'Conner336 lbs
Wathan359 lbs
Lander350.3 lbs
Mayhew353.6 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 280 lbs × 8 reps? (The answer is: 354.7 lbs). Enter the weight you lifted (e.g. 280), pick pounds or kilograms, and enter how many reps you managed (e.g. 8).
Recalculate with different values ↑

One Rep Max Table for 280 lbs

RepsOne Rep Max% of 1RM
2 reps298.7 lbs93.8%
3 reps308 lbs90.9%
4 reps317.3 lbs88.2%
5 reps326.7 lbs85.7%
6 reps336 lbs83.3%
7 reps345.3 lbs81.1%
8 reps354.7 lbs78.9%
9 reps364 lbs76.9%
10 reps373.3 lbs75%
11 reps382.7 lbs73.2%
12 reps392 lbs71.4%

FAQ

What is the one rep max for 280 lbs × 8 reps?

Lifting 280 lbs for 8 reps gives an estimated one rep max of 354.7 lbs

How much of my max is 280 lbs for 8 reps?

280 lbs for 8 reps works out at 78.9% of an estimated one rep max of 354.7 lbs.

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

90% of 354.7 lbs is 319.2 lbs and 70% is 248.3 lbs. Heavy strength work usually sits at 85–95%, while volume and technique work sits nearer 65–75%.

See Also