Start with 180 − age
This is the unadjusted MAF value—not estimated maximum heart rate.
Fitness Goal 4U · Aerobic Heart Rate
MAF 180 Aerobic Heart Rate Calculator
Estimate the MAF method’s maximum aerobic training heart rate from age and its four adjustment categories, then view the commonly used 10-bpm training band.
PHP fallbackAccessible inputsNo accountMethod-specific estimate
01180 − age
02Apply one adjustment
03Result = MAF ceiling
04Range = 10 bpm below
Calculator
Estimate your MAF aerobic training ceiling
Select the one category that best matches the method’s published wording. The calculator does not diagnose your health status or choose a category for you.
Your MAF estimate will appear here
Enter age and select one adjustment category to see the ceiling, 10-bpm training range, and formula breakdown.
The 180 Formula
How the MAF 180 method works
Choose one status category
Apply −10, −5, 0, or +5 bpm based on the MAF method’s published criteria.
Use the adjusted result
The result is the method’s upper aerobic training heart rate.
Build the training band
The commonly described MAF range extends 10 bpm below that upper value.
Adjustment rules
What the four categories mean
These are method-specific categories, not medical diagnoses.
Higher-caution category
Major illness or recovery, rehabilitation, regular medication, or chronic overtraining under MAF guidance.
Recovery / inconsistency category
Includes injury, stalled progress, frequent illness, allergies/asthma, or inconsistent/returning training.
Consistent training category
Uses 180 − age unchanged when the method’s consistency criteria are met without listed problems.
Long-term progress category
Reserved for more than two years of progress and improved performance without listed problems or injury.
Assumptions & limitations
A practical estimate—not a physiological measurement
The MAF 180 result is not measured aerobic threshold, Fatmax, lactate threshold, VO₂max, or maximum heart rate.
Not HRmax
MAF HR is an aerobic training ceiling within a specific method, not the highest heart rate reached during maximal effort.
Not a lab threshold test
Gas-exchange or lactate testing can directly characterize physiology; the 180 Formula is an indirect field method.
Heart rate varies
Heat, hydration, fatigue, stress, illness, altitude, caffeine, medications, and sensor error can affect exercise heart rate.
Symptoms come first
Do not keep exercising because a calculator number looks acceptable if you develop concerning symptoms.
Age exceptions
The source method includes special age guidance
Standard equation not applied here
The current MAF guidance says the 180 Formula is not applicable for athletes age 16 and under and notes that 165 bpm has been used instead. This calculator therefore starts at age 17.
Further individualization may be needed
The MAF source says some athletes over 65 who fit category +5 may consider up to 10 additional beats, but explicitly says this is not automatic. This calculator does not add it automatically.
Worked example
Age 40 with the −5 category
The category is only an example, not a recommendation for every 40-year-old.
180 − 40 = 140 bpm140 − 5 = 135 bpmMAF HR = 135 bpm10-bpm MAF training range: 125–135 bpm.
Related tools
Compare heart-rate training frameworks
Tool guide
Understand and use the MAF 180 Aerobic Heart Rate Calculator
Use these tool-specific notes to understand the method, enter better data, interpret the output, and apply the result appropriately.
MAF Ceiling
The MAF method starts from 180 minus age and then applies one status adjustment. The resulting value is treated as the method’s aerobic-training ceiling, not as measured HRmax or a lab threshold.
Choose One Adjustment
Select the single MAF category that best matches the method’s published criteria. The −10, −5, 0, and +5 adjustments are alternatives; they are not meant to be stacked together.
10-BPM Range
A common MAF training band extends from 10 bpm below the calculated MAF heart rate up to the ceiling. It is a method-specific training range rather than a diagnostic zone.
Use With Limits
Age 16 and under and older adults may require special handling under the source method. Heat, fatigue, medications, and health conditions can also change exercise heart-rate response.
Frequently asked questions
MAF 180 Aerobic Heart Rate Calculator FAQs
Practical answers about this tool's inputs, method, results, limitations, and common real-world use.
What does MAF stand for?
Maximum Aerobic Function in the Maffetone method. MAF HR is a training ceiling, not maximum heart rate.
Why a 10-bpm range?
Published MAF guidance describes the calculated MAF HR as the high end of a band whose low end is 10 bpm lower.
Is MAF the same as Zone 2?
No. Zone 2 has multiple definitions. MAF 180 is a separate method and should not automatically be treated as identical to another zone model.
Can medication affect the adjustment?
The MAF method places regular medication in its −10 category. Medicines can also change exercise heart-rate response, so generic targets may be inappropriate in some cases.
Should everyone over 65 add beats?
No. The method describes further individualization for some people only and says an additional adjustment is not automatic.
Is this medical guidance?
No. It is a fitness-method estimate and cannot diagnose a condition or determine whether exercise is safe for you.
Should I add more than one MAF adjustment together?
No. The source method uses one category adjustment to modify 180 minus age. Stacking several reductions or additions would create a number that is not the published MAF calculation.
Why is there special guidance for people over 65?
The MAF source describes additional individualization for older adults rather than a single automatic adjustment for everyone. The calculator therefore avoids silently adding extra beats.
Can children use the standard MAF 180 formula?
The source method gives special guidance for younger people and does not present the standard adult calculation as a universal rule for age 16 and under. The calculator keeps that limitation explicit.
Why can my heart rate drift above the MAF range in heat?
Heat, dehydration, fatigue, and prolonged exercise can raise heart rate at the same pace or power. That cardiac drift means pace may need to slow if you are trying to stay within a heart-rate ceiling.
Primary references
MAF 180 methodology sources
- The MAF 180 Formula: Heart-rate monitoring for real aerobic training (updated July 2020).
- The MAF Method eBook — adjustment categories and 10-bpm training range.
- Want Speed? Slow Down! — worked 180 Formula and 10-bpm range example.
Content reviewed: .
Health & training disclaimer
This calculator provides general fitness education and reproduces a method-specific estimate. It does not diagnose disease, prescribe a medically safe heart rate, replace an exercise test, or determine exercise safety. People with cardiovascular disease, significant illness, rehabilitation needs, medicines affecting exercise response, pregnancy, or concerning exercise symptoms should seek individualized professional guidance.