Maximum Heart Rate (220 − Age)
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220 minus age is the classic, simplest estimate of maximal heart rate, but it can be off by roughly 10–12 bpm for an individual; Tanaka's 208 − 0.7 × age is more accurate on average, and a direct test beats any formula.
Detail
Maximal heart rate is estimated with the formula:
Maximum heart rate (Max HR) = 220 − Age
This estimated maximum is the reference point from which cardiorespiratory training intensities are derived. The ACSM intensity prescriptions express the target as a percentage of this maximum — 60% to 90% of maximal heart rate (Peterson & Bryant, 1995), or 55/65–90% of maximum heart rate in the ACSM 1998 position stand. To find a working target heart rate, the chosen percentage is applied to the Max HR value.
Current research update (2026)
220 − Age (Fox et al., 1971) remains the most widely used estimate for its
simplicity, but it carries a standard deviation of roughly 10-12 bpm around
the true value — a meaningful margin of individual error. Regression
equations from larger, more rigorous samples — most commonly Tanaka,
Monahan & Seals (2001): Max HR = 208 − (0.7 × Age) — are now generally
considered more accurate on average, especially for older adults, where
220 − Age tends to underestimate true max HR. Either formula is an estimate;
a direct graded exercise test is more precise when accuracy matters. The current ACSM
position stand (Garber et al., 2011) takes the same line: specialised regression equations are
purported to be superior to 220 − Age, but further study in diverse groups of men and women
is needed before any one can be recommended for universal use, and direct measurement of heart
rate is recommended for individual prescription when feasible. See verification_note in this
module's frontmatter.
Key facts
- Classic estimate: Max HR = 220 − Age (age in years; Fox et al., 1971). It is an estimate with roughly 10–12 bpm of individual error, not a measured value.
- More accurate on average: Tanaka (2001): 208 − (0.7 × Age), especially for older adults.
- Estimated Max HR is used as the basis for percentage-of-max-HR intensity targets; ACSM (2011) recommends measuring heart rate directly for individual prescription when feasible.
- Training intensity range expressed against this value: 60–90% (Peterson & Bryant) or 55/65–90% (ACSM 1998).
- 2026 update: 220 − Age has a ~10-12 bpm standard deviation of individual error; Tanaka et al. (2001) 208 − (0.7 × Age) is generally considered more accurate on average, especially for older adults (220 − Age tends to underestimate their true max HR). Neither replaces a direct graded exercise test.
Connections
- Cardiorespiratory Conditioning Guidelines (Peterson & Bryant / ACSM) — intensity prescribed as 60–90% of this value.
- ACSM Exercise Recommendations for Healthy Adults (1998) — 55/65–90% of this value (and the VO2-reserve alternative).
- Target Heart Rate and Intensity Zones — applies the percentage to Max HR to get a beats-per-minute target.
- Beginner Heart-Rate Note (220 bpm – 192 bpm) — the source's "220 bpm – 192 bpm" beginner note.
Sources
- Position standPollock ML et al. ACSM Position Stand: The recommended quantity and quality of exercise for developing and maintaining cardiorespiratory and muscular fitness, and flexibility in healthy adults. Med Sci Sports Exerc 1998;30(6):975–991 (superseded by Garber et al. 2011) Published 1998 · DOI 10.1097/00005768-199806000-00032 · Accessed 2026-10-13
- Position standGarber CE et al. American College of Sports Medicine position stand. Quantity and quality of exercise for developing and maintaining cardiorespiratory, musculoskeletal, and neuromotor fitness in apparently healthy adults: guidance for prescribing exercise. Med Sci Sports Exerc 2011;43(7):1334–1359 Published 2011 · DOI 10.1249/MSS.0b013e318213fefb · Accessed 2026-10-13
Corrections (2)
- 2026-10-13 — Added the current ACSM position on the formula: the 2011 position stand (Garber et al.) notes that specialised regression equations are purported to be superior to 220 − Age, but says further study in diverse populations is needed before any one can be recommended for universal use, and recommends direct measurement of heart rate for individual prescription when feasible. The existing Tanaka note is kept. The 1998 and 2011 stands are now cited as dated sources.
- 2026-10-24 — Summary and key facts aligned with the current research update (Phase 3 editorial).
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Educational content only — not medical advice. Always consult a qualified professional for individualized guidance, especially around injury, pregnancy, or medical conditions.