Cardiac Age Calculator — Estimate Your Age from Max Heart Rate
Do you know your measured maximum heart rate (MHR) from a field test or intense effort? This page does the reverse calculation: it tells you what age corresponds to your MHR according to the three main scientific formulas — a fun tool to explore your cardiac age.
1. Calculator — Your Age from Your MHR
4. How Does the Reverse Calculation Work?
MHR estimation formulas give heart rate as a function of age. By mathematically reversing these formulas, we obtain the age from the MHR.
Fox & Haskell (reverse)
MHR = 220 − age → Age = 220 − MHR
Example: MHR = 185 bpm → Fox Age = 220 − 185 = 35 years
Tanaka (reverse)
MHR = 208 − 0.7 × age → Age = (208 − MHR) ÷ 0.7
Example: MHR = 185 bpm → Tanaka Age = (208 − 185) ÷ 0.7 ≈ 33 years
Nes (reverse)
MHR = 211 − 0.64 × age → Age = (211 − MHR) ÷ 0.64
Example: MHR = 185 bpm → Nes Age = (211 − 185) ÷ 0.64 ≈ 41 years
| Formula | Direct equation | Inverse equation | Example (MHR = 185) |
|---|---|---|---|
| Fox & Haskell | MHR = 220 − age | Age = 220 − MHR | 35 yrs |
| Tanaka (2001) | MHR = 208 − 0.7 × age | Age = (208 − MHR) ÷ 0.7 | 33 yrs |
| Nes (2013) | MHR = 211 − 0.64 × age | Age = (211 − MHR) ÷ 0.64 | 41 yrs |
5. Reference Table: MHR → Estimated Age
For different measured MHR values, the cardiac age estimated by each formula.
| MHR (bpm) | Fox Age | Tanaka Age | Nes Age | Average |
|---|---|---|---|---|
| 200 bpm | 20 yrs | 11 yrs | 17 yrs | 16 yrs |
| 195 bpm | 25 yrs | 19 yrs | 25 yrs | 23 yrs |
| 190 bpm | 30 yrs | 26 yrs | 33 yrs | 30 yrs |
| 185 bpm | 35 yrs | 33 yrs | 41 yrs | 36 yrs |
| 180 bpm | 40 yrs | 40 yrs | 48 yrs | 43 yrs |
| 175 bpm | 45 yrs | 47 yrs | 56 yrs | 49 yrs |
| 170 bpm | 50 yrs | 54 yrs | 64 yrs | 56 yrs |
| 165 bpm | 55 yrs | 61 yrs | 72 yrs | 63 yrs |
| 160 bpm | 60 yrs | 69 yrs | 80 yrs | 70 yrs |
| 155 bpm | 65 yrs | 76 yrs | 88 yrs | 76 yrs |
Note: Nes ages may seem high because the formula is calibrated on active athletes whose MHR declines more slowly with age.
Frequently Asked Questions — cardiac age and MHR
How do you estimate your age from your max heart rate?
Reverse the formulas: Fox: age = 220 − MHR. Tanaka: age = (208 − MHR) ÷ 0.7. Nes: age = (211 − MHR) ÷ 0.64.
What is cardiac age?
The theoretical age corresponding to your measured MHR. A cardiac age below your real age may indicate good cardiovascular fitness, or simply genetic variability — it's a statistical estimate, not a clinical measurement.
Why do the three formulas give different ages?
Fox (1970) is the oldest and least accurate. Tanaka (2001) is based on 18,712 participants. Nes (2013) is calibrated on active athletes with a shallower aging slope. The difference can reach 5-10 years for the same MHR.
How do I accurately measure my max heart rate?
The gold standard is a supervised maximal stress test. For a field test, perform 2-3 repetitions of 2-3 minute near-maximal efforts after a proper warm-up, and record the peak HR on a heart rate monitor during the 2nd or 3rd repetition.
6. Limitations & Precautions
- Cardiac age is a statistical estimate, not a clinical measurement.
- Cardiac medications (beta-blockers) lower MHR and distort these calculations.
- MHR is partly genetic: a high or low MHR is not necessarily correlated with fitness level.
- For a precise evaluation, consult a doctor or do a supervised stress test.
Go Further
- Calculate your MHR from your age (classic method)
- Estimate your VO₂ max to measure aerobic capacity
- Discover your fitness age overall
- Calculate your training paces from your MHR