Maximum Heart Rate Calculator
Age based maximum heart rate and training zones from the Tanaka or 220 minus age formula.
What it does
Maximum heart rate is the highest safe beats per minute your heart can reach during hard effort. It is set mainly by age, not by how fit you are, which is why a 40 year old and a trained athlete the same age share a similar ceiling.
The tool above uses the Tanaka formula (208 minus 0.7 times age) or the simpler 220 minus age rule. It also computes heart rate reserve and five training zones from recovery to peak, so you can see where easy, fat burn, cardio, hard, and peak efforts land.
These zones are percentages of heart rate reserve, not raw percentages of max. That means two people with the same max but different resting pulses get different target numbers.
Use the zones as a guide for easy runs, interval sessions, and recovery days. Medication such as beta blockers lowers real heart rate, so anyone on rate-limiting drugs should follow their clinician instead of this math.
How to use
- Enter your age in years.
- Enter your resting pulse in beats per minute, taken first thing in the morning.
- Pick Tanaka or the standard 220 minus age formula.
- Read max heart rate first, then the zone ranges.
- Match your workout effort to the zone that fits the goal.
Formula
- age
- Age in years.
- resting
- Resting pulse in beats per minute.
- max
- Maximum heart rate in beats per minute.
- reserve
- Heart rate reserve: max minus resting.
Tanaka fits large population data better than 220 minus age, especially past age 40. Neither formula is exact for any one person, so treat the number as a planning ceiling and listen to your body.
Worked example
Example: age 40, resting 60 bpm, Tanaka
Age 40, resting pulse 60 bpm, Tanaka formula.
- Max heart rate: 208 - 0.7 x 40 = 208 - 28 = 180 bpm.
- Heart rate reserve: 180 - 60 = 120 bpm.
- Fat burn 60-70%: 60 + 120 x 0.6 to 60 + 120 x 0.7 = 132 to 144 bpm.
- Cardio 80-90%: 60 + 120 x 0.8 to 60 + 120 x 0.9 = 156 to 168 bpm.
- Tool shows max 180 bpm, fat burn 132 - 144 bpm, cardio 156 - 168 bpm.
Reference table
| Age | Max HR | Reserve | Fat burn zone |
|---|---|---|---|
| 30 | 187 bpm | 127 bpm | 136 - 149 bpm |
| 40 | 180 bpm | 120 bpm | 132 - 144 bpm |
| 50 | 173 bpm | 113 bpm | 128 - 139 bpm |
| 60 | 166 bpm | 106 bpm | 124 - 134 bpm |
Limits
- Formulas are population averages and can miss by 10 to 15 beats for an individual.
- Beta blockers and other rate limiting drugs lower real heart rate past what age predicts.
- Heat, dehydration, caffeine, and stress push heart rate above the formula number.
- Max heart rate is a ceiling, not a target to hit every workout.
Common mistakes
- Using 220 minus age for every person without considering Tanaka.
- Reading raw percent of max instead of percent of reserve.
- Trying to hit max heart rate in every training session.
- Ignoring medication that blunts heart rate response.
- Skipping a warm up and jumping into the cardio zone cold.
Try it yourself
Quick checks. Answers sit tucked under each question.
Age 30, rest 70, Tanaka max?
Max 187 bpm, reserve 117 bpm.
Age 50, rest 65, cardio zone?
Max 173 bpm, cardio 151 - 162 bpm.
Age 40, rest 60, standard formula max?
Max 180 bpm (220 - 40).
Questions
Which formula should I use?
Tanaka fits population data better past age 40. The standard 220 minus age is simpler and still widely used.
Are these zones exact?
No. They are estimates from age and rest. A lab or field test gives a personal number.
Does fitness change max heart rate?
Not much. Max is set mainly by age; fitness changes how long you can hold a high effort, not the ceiling.
What if I take beta blockers?
Rate limiting drugs lower real heart rate, so the formula overstates your effort. Follow your clinician.
Can I exceed my max?
Briefly, yes, but it is not a training target. Sustained effort near max should be rare and guided.
How do I measure resting pulse?
Count beats for 60 seconds first thing in the morning, before getting out of bed.
Sources
- American Heart Association: Target Heart Rate
- Centers for Disease Control and Prevention: Physical Activity