Target Heart Rate Percentage Calculator

Formula

(220 − age) × intensity

Worked example

With Age: 30 years, Intensity: 70 %, estimated target rate is 133 bpm.

Calculation method

The rule is (220 − age) × intensity.

The tool first estimates maximum heart rate as 220 − age, then takes the chosen percentage of that estimate. Both steps add uncertainty.

For this target heart rate percentage example, changing age from 30 years to 31 years while keeping the other inputs fixed changes estimated target rate from 133 bpm to 132.3 bpm.

Reading estimated target rate

The output is an estimated number of beats per minute, not a measured personal maximum. In the worked values on this page, age 30 years, intensity 70 % produce estimated target rate 133 bpm.

Practical use

Use the number as a broad reference when planning exercise intensity, not as a strict limit or diagnosis. The specific task here is to find estimated target rate from age, intensity.

Limits and common mistakes

The 220 − age rule has substantial individual variation. Medical conditions and medications can also affect heart rate; use professional guidance for health decisions. Verify age in years before interpreting estimated target rate; a value measured on another basis would answer a different question.

Read the example and units

The worked values on this page use age 30 years and intensity 70 %. With those exact entries, the calculator reports estimated target rate 133 bpm. The output describes estimated target rate under the displayed equation. It does not automatically include a separate cost, rate, or quantity absent from the listed fields. The result uses the units and population assumptions stated on this page. A calculated screening value or estimated energy or heart-rate number is not a direct clinical measurement. Check the source measurement method and the scope of the formula before comparing it with a personal health record.

Compare one changed input

For a second scenario, change only age 30 years to age 33 years and leave the other example entries alone. The result for estimated target rate changes from 133 bpm to 130.9 bpm. Comparing one changed input at a time shows exactly which assumption drove the difference in this calculation. This is a sensitivity check on the equation, not a prediction of an individual response. Measurement error and variation between people can be larger than the numerical difference between two nearby scenarios.

How to interpret this kind of result

The 220-minus-age estimate is a population shortcut, not a measured maximum for one person. A target percentage multiplies that estimate, so uncertainty in the starting estimate also affects the target. The output is beats per minute under the stated arithmetic assumptions, not a diagnosis or a safety threshold. For this target heart rate percentage calculation, age in years and intensity in % determine estimated target rate; the displayed estimated target rate 133 bpm belongs to that exact combination rather than to a different rate, term, or measurement basis.

Scope and practical checks

Fitness, medication, medical conditions, heat, and measurement method can alter an observed heart rate. Do not interpret a calculated value as permission to exceed symptoms or professional advice. A wearable reading and this age-based estimate answer different questions; use a qualified source for individualized exercise guidance. Check the age in years and intensity in % entries against the quantities in your own situation before using estimated target rate; this page cannot infer a field or condition that you did not enter.

Common questions

What does this target heart rate percentage result include?

The estimated target rate comes from age in years and intensity in % using the displayed rule (220 − age) × intensity. It does not automatically include a condition absent from the listed inputs. Treat the result as the formula’s estimate or screening measure, not an individual medical diagnosis or prescription.

Sources and references

• Formula reference
• American Heart Association: Target Heart Rates Chart