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/ Max Aerobic Heart Rate (MAF / 180 Formula) Calculator
Max Aerobic Heart Rate (MAF / 180 Formula) Calculator
Calculate your maximum aerobic training heart rate threshold using Phil Maffetone's 180 formula.
Understanding the MAF 180 Formula
The **Maximum Aerobic Function (MAF)** formula, pioneered by Dr. Phil Maffetone, focuses on training your body to burn fat for fuel instead of glucose. By keeping your heart rate strictly under the MAF threshold during aerobic activities, you build a massive aerobic base, lower stress levels, and reduce recovery times.
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Exceeding the threshold shifts your metabolism from aerobic (fat burning) to anaerobic (sugar burning), which causes fatigue and generates stress hormones.
Most athletes see substantial aerobic speed gains within 3 to 6 months of strict MAF training.