CalMacroCalcPR CalculatorCalculate your true one-rep max with precision
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lbs
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lbs
Enter your actual tested one-rep max for this lift to calibrate future predictions. This improves accuracy by adapting the calculator to your personal strength curve.
⚠️ Click to use calibration. For advanced users only who have tested their true 1RM.
Average 1RM
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Your estimated true one-rep max based on all formulas.
Training Percentages
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⚠️ Advanced Feature Warning
The "Real 1RM" field is for advanced users who have actually tested their true one-rep max under proper conditions.
✅ Use ONLY if you've tested your max with a spotter
✅ This will calibrate ALL future predictions for this lift
❌ Do NOT guess or estimate - this reduces accuracy
❌ Leave blank if unsure - standard formulas work great