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    One Rep Max for 400 lbs × 7 reps

    One Rep Max Calculator
    One Rep Max for
    lifted for
    reps

    What is the one rep max for 400 lbs × 7 reps?

    Answer

    Lifting 400 lbs for 7 reps gives an estimated one rep max of
    493.3 lbs

    A set of 7 reps at 400 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:

    400 × (1 + 7 ÷ 30)

    ≈

    400 × 1.2333

    ≈

    493.3 lbs

    Training Weights as a % of 1RM

    Percentages of your estimated max of 493.3 lbs, the way most strength programmes prescribe load:

    % of 1RMWorking Weight
    95%468.7 lbs
    90%444 lbs
    85%419.3 lbs
    80%394.7 lbs
    75%370 lbs
    70%345.3 lbs
    65%320.7 lbs
    60%296 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 400 lbs × 7 reps:

    FormulaEstimated 1RM
    Epley493.3 lbs
    Brzycki480 lbs
    Lombardi485.9 lbs
    O'Conner470 lbs
    Wathan498.3 lbs
    Lander484.3 lbs
    Mayhew495.6 lbs

    Related Calculations

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    What is my 1 rep max for 400 lbs × 7 reps?. 400 lbs for 7 reps gives an estimated one rep max of 493.3 lbs. That set is 81.1% of your maximum — see the full rep table.
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    One Rep Max Table for 400 lbs

    RepsOne Rep Max% of 1RM
    2 reps426.7 lbs93.8%
    3 reps440 lbs90.9%
    4 reps453.3 lbs88.2%
    5 reps466.7 lbs85.7%
    6 reps480 lbs83.3%
    7 reps493.3 lbs81.1%
    8 reps506.7 lbs78.9%
    9 reps520 lbs76.9%
    10 reps533.3 lbs75%
    11 reps546.7 lbs73.2%
    12 reps560 lbs71.4%

    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 400 lbs × 7 reps? (The answer is: 493.3 lbs). Enter the weight you lifted (e.g. 400), pick pounds or kilograms, and enter how many reps you managed (e.g. 7).
    Recalculate with different values ↑

    FAQ

    What is the one rep max for 400 lbs × 7 reps?

    Lifting 400 lbs for 7 reps gives an estimated one rep max of 493.3 lbs

    How much of my max is 400 lbs for 7 reps?

    400 lbs for 7 reps works out at 81.1% of an estimated one rep max of 493.3 lbs.

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

    90% of 493.3 lbs is 444 lbs and 70% is 345.3 lbs. Heavy strength work usually sits at 85–95%, while volume and technique work sits nearer 65–75%.

    See Also