Estimate aerobic fitness from heart-rate heuristics
2026-06-01
From VO2 test or estimate: 220 - age
Measure upon waking. Lower = better aerobic fitness.
VO2Max norms differ by gender
Aerobic Fitness Estimate
Estimated VO2 Max
55.5
mL/kg/min
Fitness Level
Excellent
Percentile
85-94th percentile
Aerobic Threshold
157 bpm
85% of max HR
| Aerobic Zone | % of Max HR | Heart Rate Range (bpm) |
|---|---|---|
| Recovery/Easy | 50% | 118–131 |
| Aerobic Base | 70% | 131–151 |
| Aerobic Threshold | 85% | 151–165 |
| Maximal Aerobic | 95% | 165–178 |
💡 Training Recommendation
Add tempo/threshold work (1–2x/week) to VO2Max intervals; build aerobic base.
| Category | Men | Women | Notes |
|---|---|---|---|
| Elite | 65-85+ | 55-75+ | Endurance athletes |
| Very Good | 50-60 | 45-55 | Regular training 5+hrs/week |
| Good | 40-50 | 35-45 | Active person |
| Average | 30-40 | 25-35 | Sedentary |
Note: Treat these values as a rough fitness screen. Lab testing is the only way to measure VO2 max directly.
VO2 Max is the maximum amount of oxygen your body can utilize during intense exercise, measured in milliliters of oxygen per kilogram of body weight per minute (mL/kg/min). It represents your aerobic system's capacity—the higher your VO2 Max, the more oxygen your muscles can extract, supporting longer, faster endurance efforts.
Why VO2 Max Matters:
Most people's VO2 Max declines ~0.5 mL/kg/min per year after age 25, but training can slow or reverse this decline. Use this page to spot trends, not to replace testing.
VO2 Max improves through targeted aerobic training, especially high-intensity intervals that stress the cardiovascular system.
Training Method 1: VO2 Max Intervals
3–5 min at 95–105% aerobic threshold
Example: 5×4 min at 180 bpm (with 3 min recovery)
Frequency: 1–2x/week | Best for improving VO2 Max
Training Method 2: Long Slow Distance (LSD)
60–90+ min at 65–70% aerobic threshold
Builds aerobic base and oxidative capacity
Frequency: 1x/week | Foundation for reaching high VO2 Max
Training Method 3: Threshold Work
20–30 min at 85–95% aerobic threshold
Improves aerobic efficiency and lactate clearance
Frequency: 1x/week | Bridges base and high-intensity
Weekly Structure for VO2 Max Improvement
Mon: Rest or easy cross-training
Tue: VO2 Max intervals (3–4 sessions/week total)
Wed: Recovery/easy
Thu: Threshold or tempo effort
Fri: Easy or rest
Sat: Long slow distance
Sun: Easy or complete rest
💡 Key Principle: VO2 Max improves fastest when you alternate high-intensity work (1–2x/week) with easy, long-duration efforts. Consistency over 8–12 weeks yields 5–15% gains.
Scenario: Jordan, a 32-year-old runner, has a max HR of 190 bpm and resting HR of 55 bpm. What's his estimated VO2 Max, and should he train to improve it?
Calculating Jordan's VO2 Max:
① Input Data
Max HR: 190, Resting HR: 55, Male, Age 32
② Calculate HRR
HRR = 190 – 55 = 135 bpm
③ Use Karvonen Formula
VO2 Max ≈ 15 × (Max HR / Resting HR)
VO2 Max ≈ 15 × (190 / 55) = 51.8 mL/kg/min
④ Aerobic Threshold (85%)
AT = 55 + (135 × 0.85) = 169.75 ≈ 170 bpm
Jordan's Results & Plan:
"VO2 Max: 51.8 mL/kg/min (Excellent, 85th percentile for males). Jordan should maintain fitness with 1–2 VO2 Max interval sessions/week and long runs. To improve further, focus on threshold work and long slow distance 3–4x/week for 8 weeks—could realistically reach 55+ mL/kg/min."
What is a good VO2 Max?
Male: 40–50 is good, 50–60 is excellent, 60+ is elite. Female: 35–42 is good, 42–50+ is excellent. Varies by age and sport.
How is VO2 Max officially measured?
Lab testing: Running/cycling to exhaustion on a treadmill/bike while monitoring oxygen consumption. Mask measures O2 in/out.
How accurate are estimates?
Heart rate formulas are rough (±5–10%). Lab testing is gold standard. Estimates are useful for tracking trends, not absolutes.
Can I improve VO2 Max after 50?
Yes, but declining faster. Training can still yield 10–15% gains, slowing age-related decline. Never too late to improve.
How long to improve VO2 Max?
8–12 weeks of consistent training (3–4x/week). Initial adaptations appear in 3–4 weeks; plateau at ~12 weeks.
Do I need to do intervals to improve?
Intervals are fastest path to VO2 Max gains, but long easy runs also improve it slowly. Mix both for best results.
Does genetics limit VO2 Max?
Yes, genetics account for ~50% of VO2 Max variation. But trained athletes often exceed genetically "predicted" values via training.
What causes low resting HR?
Regular aerobic training increases vagal tone (parasympathetic). Lower RHR = better cardiac efficiency, ~10 bpm per 10 mL/kg/min VO2 Max.
Related Tools
Estimate AT heart rate.
Estimate treadmill test results.
Estimate elliptical calories.
Calorie burn jumping rope.
Calculate training heart rate zones.
Calculate maximum oxygen uptake.