Live math canvas
One Rep Max Calculator: 114.6 estimated 1RM. Epley 116.7; Brzycki 112.5; averaged estimate 114.6. Training max at 90% = 103.1.
Formula applied
CalculationTime keeps the method visible so the number can be checked instead of blindly trusted.
Epley = weight x (1 + reps / 30). Brzycki = weight x 36 / (37 - reps). Estimate = average of both formulas.Your live breakdown
These values come from the controls above and update when the calculator changes.
Resulting answer
Epley 116.7; Brzycki 112.5; averaged estimate 114.6. Training max at 90% = 103.1.
Assumptions used
Strength estimate only. Use proper safety and coaching for heavy lifting.
Master’s Tip
For programming, a conservative training max is usually more useful than chasing the highest theoretical 1RM.
Printable record
Save the inputs, result, formula, assumptions, page URL and date together so the calculation can be reviewed later.
One Rep Max Calculator averages Epley and Brzycki estimates and shows a training-max percentage for programming.
Epley = weight x (1 + reps / 30). Brzycki = weight x 36 / (37 - reps). Estimate = average of both formulas.
100 for 5 reps gives about 116.7 by Epley and 112.5 by Brzycki, averaging about 114.6.
For programming, a conservative training max is usually more useful than chasing the highest theoretical 1RM.
General fitness estimate using the Karvonen heart-rate-reserve method.
Methodology & Accuracy
CalculationTime pages are built around visible arithmetic: the formula, assumptions, worked example and practical limitations are shown so the result can be checked rather than simply trusted.
Epley = weight x (1 + reps / 30). Brzycki = weight x 36 / (37 - reps). Estimate = average of both formulas.
General fitness estimate using the Karvonen heart-rate-reserve method.
Where a calculator follows a named legal, trade or industry standard, that standard is cited visibly. Otherwise the page uses transparent general arithmetic and states its limits.For programming, a conservative training max is usually more useful than chasing the highest theoretical 1RM.
No. It is a rough population estimate and individual maximum heart rate can vary.
It is the gap between estimated maximum heart rate and resting heart rate, used to scale training intensity.
1RM formulas let lifters estimate strength from submaximal sets without always testing a true max.
The calculator keeps the input values, formula trail and limitation note visible so the result can be checked later instead of treated as a magic number.
A useful result is one that can be compared with a statement, plan, workout log, timetable or worksheet after the page is closed.