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FINANCIAL ANALYSTS & CPA REVIEWERS
About This Tool
One Rep Max (1RM) Calculator is an interactive online calculator on ubifytools.com. Estimate your maximum one-repetition strength for barbell squat, bench press, and deadlift from sub-maximal sets using Brzycki, Epley, and Lombardi models.
Fast, 100% free, private client-side processing directly in your browser with zero server data storage.
How to Use
- 1
Enter your parameter values into the input fields.
- 2
Adjust optional settings or unit parameters.
- 3
View real-time calculated metrics and breakdown statistics.
- 4
Copy the results summary or print your report for documentation.
Frequently Asked Questions
How many reps is the 1RM calculator most accurate for?
Calculations are most accurate when inputting clean sub-maximal sets between 2 and 6 repetitions. Beyond 10 reps, anaerobic muscular endurance introduces greater estimation variance.
Can I use this calculator for both kilograms and pounds?
Yes. The calculation is purely scalar, so the output matches whichever unit of measurement you enter for weight.
Are my lifting numbers saved or sent to any remote tracker?
No. All calculations run strictly in your web browser memory with zero network data transfer.