One Rep Max Lifting (1RM) is a verified health & fitness calculation tool on Calcify. Calculate your theoretical One-Rep Max (1RM) and training percentage loads using Epley and Brzycki equations. All calculations execute locally in your browser with multi-currency support, visual breakdowns, and white-label client exports.
Brzycki 1RM: 92.9 kg | 80% Hypertrophy Load: 76.8 kg
Epley: 1RM = Weight × (1 + Reps / 30); Brzycki: 1RM = Weight × [ 36 / (37 - Reps) ]
Example Inputs: Weight Lifted (kg or lbs): 80 kg · Repetitions Completed to Failure (1–15): 6 Reps
Example Output: Estimated One-Rep Max (1RM): 96.0 kg (Brzycki 1RM: 92.9 kg | 80% Hypertrophy Load: 76.8 kg)
The One Rep Max Lifting (1RM) on Calcify applies the verified mathematical formula: Epley: 1RM = Weight × (1 + Reps / 30); Brzycki: 1RM = Weight × [ 36 / (37 - Reps) ]. Every input is validated in real time with multi-currency formatting to ensure zero rounding or division errors.
Most accurate when calculated from sets performed between 2 and 10 repetitions.
Yes. On Calcify, you can click the Share button to share via native mobile/desktop share sheets, or click "Export Report" -> "Export with My Branding" to upload your logo, add company details, and download a custom PDF, PNG, or CSV report powered by Calcify.
Calculate clinical Body Surface Area (BSA in m²) using Mosteller and Du Bois & Du Bois formulas.
Calculate Lean Body Mass (LBM) and Fat-Free Mass Index (FFMI) using the Boer clinical equation.
Estimate theoretical Blood Alcohol Concentration (BAC %) using the Widmark pharmacokinetic equation.
Calculate Body Mass Index (BMI), WHO classification, Ponderal Index, and healthy weight range.