How is estimated maximum heart rate (HRmax) commonly calculated?

• A. HRmax = 200 - age
• B. HRmax = 0.5 × age
• C. HRmax ≈ 220 minus age
• D. HRmax = 70 + age

Answer: (C)

A simple rule of thumb is used to estimate how high the heart can max out during exercise, so you can set safe and effective training intensities. The widely used estimate is HRmax ≈ 220 minus your age in years. This handy formula gives a quick target to base effort levels on, such as 60–85% of HRmax for aerobic training.

Why this works well here: it’s easy to calculate in real time without specialized testing, and it maps neatly onto training zones that help you work at the right effort. For example, a 30-year-old would have an estimated HRmax of about 190 beats per minute, so training at 114–152 bpm would fall into moderate-to vigorous intensity.

Other options don’t fit the common approach: 200 minus age is not the standard estimate, half of age would produce unrealistically low max values, and 70 plus age would increase with age in a way that generally overestimates what most people can reach. Keep in mind this is an estimate and individual max heart rate can vary, with some newer formulas (like 208 − 0.7 × age) offering small refinements, but 220 − age remains the most commonly used for simplicity.