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Exercise & fitness

Training, performance, heart-rate, and activity estimates.

Choose the tool whose inputs and output match your task. Check each calculator’s assumptions and limitations before using its result.

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Exercise tools turn a few personal inputs into training numbers: heart-rate targets, strength estimates, and field-test fitness scores. The target heart rate calculator estimates maximum heart rate from age and returns moderate or vigorous ranges, while the heart rate zone calculator applies your own chosen percentages to heart-rate reserve for finer control. Strength lifters can use the one rep max calculator to estimate a one-rep maximum from a completed set, and the VO2max estimator converts a 12-minute run or walk into a cardiorespiratory benchmark. Results are population-level estimates — pacing, weather, and measurement all change real numbers — and none of these tools prescribes an intensity or diagnoses fitness. Browse related tools in the Health collection.

4 of 4 calculators

Frequently asked questions

How is maximum heart rate estimated?
When 'Use custom max HR' is off, the calculator uses the sex-neutral Tanaka age estimate: HRmax = 208 − 0.7 × age. When it is on, you enter a maximum from 120 to 220 bpm, and that entered value is used instead.
How are the zone endpoints calculated?
Heart-rate reserve is HRR = HRmax − resting heart rate. Each endpoint is then resting heart rate plus HRR × the selected percentage, rounded to whole bpm. For age 30 with a 60 bpm resting rate and an estimated 187 bpm maximum, the 60–70% band is 136–149 bpm.
Does the calculator assign an intensity classification?
No. It performs arithmetic only and does not determine whether a selected percentage is appropriate, nor does it attach a purpose, benefit, or intensity classification to the result.

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Running & enduranceStrength & trainingTemperature & humidity

Related comparisons

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6 Minute Walk Test vs VO2max EstimatorCompare the two timed-distance aerobic capacity tests: the submaximal six-minute walk with sex-specific predicted distance and percent expected versus the maximal-effort 12-minute Cooper run/walk with a VO2max estimate and reference bands.Heart Rate Zone vs Target Heart Rate CalculatorCompare heart-rate training tools: a target range from age and a fixed percentage of estimated maximum heart rate versus a user-selected percentage band applied to heart-rate reserve.Heart Rate Zone vs VO2max CalculatorCompare heart rate reserve zone and VO2max estimator calculators: one sets daily training band targets from resting heart rate, the other benchmarks aerobic capacity from a 12-minute test.One Rep Max vs Vertical Jump CalculatorCompare the one rep max estimate from a completed set with the measured vertical jump protocol: predictive strength formulas versus direct jump-height measurement.VO2max Estimate vs One Rep Max CalculatorCompare two field fitness estimates: VO2max from a 12-minute run versus one-repetition maximum from a submaximal set.

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