Estimate capacity from staged cycling heart rates. Compare workloads, pulse trends, and projected fitness safely. Make smarter training choices using structured submax test insights.
Enter steady-state heart rates, usually taken near the end of each stage. Use at least two valid workloads. More stages can improve the projection line.
| Variable | Example Value | Notes |
|---|---|---|
| Sex | Male | Used for the general fitness band guide. |
| Age | 30 years | Age-predicted max HR = 220 − age. |
| Weight | 72.5 kg | Needed for VO2 calculations. |
| Stage 1 | 150 kgm/min, 118 bpm | Steady-state heart rate near stage end. |
| Stage 2 | 450 kgm/min, 132 bpm | Higher load raises aerobic demand. |
| Stage 3 | 600 kgm/min, 147 bpm | Optional third point strengthens the trend line. |
| Predicted VO2 max | About 39 to 45 ml/kg/min | Typical range for this sample pattern. |
1) Age-predicted maximal heart rate
Max HR = 220 − Age
2) Linear projection between workload and heart rate
HR = m × Workload + b
3) Regression slope
m = [nΣ(xy) − ΣxΣy] / [nΣ(x²) − (Σx)²]
4) Regression intercept
b = [Σy − mΣx] / n
5) Projected maximal workload
Workloadmax = (Max HR − b) / m
6) Predicted VO2 max
VO2 max (ml/kg/min) = [(1.8 × Workloadmax) / Body Weight in kg] + 7
7) Absolute oxygen uptake
VO2 max (L/min) = [VO2 max (ml/kg/min) × Body Weight] / 1000
Workload is handled internally in kgm/min. If you enter watts, the page converts using 1 watt ≈ 6.12 kgm/min.
It estimates aerobic capacity, usually reported as VO2 max. The method uses submaximal cycling workloads and heart-rate responses, then projects the workload that would match age-predicted maximal heart rate.
The calculator builds a line between workload and heart rate. One point cannot form a regression trend, so at least two valid stages are required to estimate maximal workload.
Use a steady-state value, ideally taken near the end of the stage once heart rate stabilizes. Random early readings can distort the slope and reduce accuracy.
Yes. The page accepts watts and converts them internally to kgm/min for the YMCA equations. It also shows both units in the results table.
Very low stage heart rates may not provide enough cardiovascular stress for a strong projection. YMCA-style estimates usually perform better when working stages reach at least about 110 bpm.
That stage may be too intense for a submaximal protocol. The estimate can still be shown, but interpretation should be more cautious because the test is moving beyond the usual YMCA target range.
No. It is only a general guide based on age, sex, and predicted VO2 max. Training status, medications, health conditions, and protocol quality can all affect interpretation.
No. It is a screening and training-planning tool. Clinical decisions, medical clearance, or symptom-based concerns should be handled by qualified healthcare or exercise professionals.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.