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One Rep Max Calculator – Estimates the maximum weight liftable for one r...

The One Rep Max Calculator estimates the maximum weight liftable for one repetition based on a lighter, higher-rep set. This One Rep Max Calculator uses an established clinical or fitness formula to give you a personalised estimate in seconds. Results are for educational reference — for specific health decisions, discuss with your doctor.

The formula behind this calculator: Commonly uses the Epley formula: 1RM = weight x (1 + reps/30). As a practical example: Lifting 185lbs for 5 reps estimates a one-rep max of about 216lbs. All results are calculated instantly in your browser — no data is stored or transmitted.

One Rep Max Calculator FAQ

What does the One Rep Max Calculator calculate?

Estimates the maximum weight liftable for one repetition based on a lighter, higher-rep set.

Can this calculator track my progress over time?

This tool doesn't store data between sessions. For tracking, record results manually or use a health app alongside this calculator.

Is this a substitute for medical advice?

No. These calculators provide general estimates for educational purposes only. Always consult a doctor or qualified health professional for medical decisions.

Does this work on mobile?

Yes — fully responsive and optimised for smartphones, tablets, and desktop browsers.