An estimated one-rep max is a training reference, not a completed PR or a prescription for your next attempt.
Use a recent, consistent set
Enter a set performed with the same lift variation and technique you want to track. A paused bench and a touch-and-go bench are different comparisons. Record the load and reps actually completed, including the bar.
These formulas do not know how many reps you had left. A comfortable set stopped early may understate your maximum; a set with help from a spotter does not represent an unassisted performance. Do not take a set to failure just to feed the calculator.
This tool accepts one to ten reps. Higher-rep predictions become increasingly dependent on endurance, technique, and the individual, so the input range is deliberately limited.
The formulas, with a worked example
The Epley estimate is weight × (1 + reps ÷ 30). The Brzycki estimate is weight × 36 ÷ (37 − reps). For one rep, this tool returns the weight you actually entered instead of adding a formula bonus.
For 225 lb lifted five times, Epley gives 262.5 lb and Brzycki gives approximately 253.1 lb. The disagreement is useful: it shows why a predicted max should not be treated as an exact ability test.
We display Epley as the main estimate and Brzycki beside it. We do not present the interval between them as a statistical confidence range. Both formulas can be wrong for the same person.
How to use the number in training
Compare similar sets over time using the same formula. An increase from 225 × 5 to 230 × 5 is easier to interpret than a comparison between a fresh single and a fatigued set of ten.
Use your program’s rules to choose working weights. An estimated 262.5 lb maximum does not mean you should load 262.5 lb on your next visit. Warm-up performance, recent training, recovery, and coaching can all change the appropriate next step.
A day-to-day dip is not automatically lost strength. Note sleep, missed sessions, a change in technique, or an unusually hard preceding workout before rewriting your plan.
Does an estimated max count toward the 1000 pound club?
For a total built from completed singles, no. Keep a separate column for estimated maxes so you can use them without silently inflating your PR total.
You could estimate each lift and add the results as a planning exercise, but call the sum an estimated total. When you have completed singles, enter those into the 1000 pound club calculator.
Keep both views in your training log: what you have actually done, and what your recent rep work may suggest. The first records an achievement; the second helps you notice a trend.
A goal worth keeping track of.
1000 Pound is building a mobile app around your squat, bench, deadlift, and the real singles that make up your total. Coming soon for iOS and Android.
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