Zone 2 Cardio Heart Rate Calculator
Optimize your aerobic base and fat-burning potential
Leave blank for the standard formula
Your Target Zone 2 Range:
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What is Zone 2 Cardio?
Zone 2 training refers to exercise performed at a low-to-moderate intensity where your body primarily uses fat as its main fuel source through aerobic metabolism. It is often described as a "steady-state" pace where you can still maintain a conversation—the "Talk Test."
How We Calculate Your Zone
This calculator uses two distinct methods depending on the data you provide:
- Standard Formula (Fox): Uses the classic (220 – Age) formula to determine Maximum Heart Rate (MHR) and targets 60-70% of that figure.
- Karvonen Formula: If you provide your Resting Heart Rate (RHR), we use Heart Rate Reserve (HRR). This is generally considered more accurate because it accounts for your individual fitness level.
Training Examples by Age
| Age | Estimated Zone 2 (Standard) |
|---|---|
| 25 Years Old | 117 – 137 BPM |
| 35 Years Old | 111 – 130 BPM |
| 45 Years Old | 105 – 123 BPM |
| 55 Years Old | 99 – 116 BPM |
Benefits of Zone 2 Training
Training in Zone 2 is the foundation of aerobic fitness. High-level athletes spend up to 80% of their time in this zone because it:
- Increases Mitochondrial Density: Improves how efficiently your cells produce energy.
- Improves Lactate Clearance: Helps you recover faster from high-intensity efforts.
- Fat Oxidation: Maximizes the body's ability to burn fat for fuel.
- Reduces Injury Risk: Provides cardiovascular benefits without the extreme stress of high-intensity interval training (HIIT).