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How to calibrate your Apple Watch for optimal performance

Fine-tune your device for the most accurate stats.
August 19, 2023
An Apple Watch Series 7 on a user's wrist displays the Outdoor Run screen
Kaitlyn Cimino / Android Authority

Fitness trackers are only useful if they’re accurately tracking. Luckily, the Apple Watch is one of the more accurate devices you can count on (pun intended). Still, you want to be sure that you’re going to get the best stats possible when you add a workout to your Apple Watch and get moving. Find out how to calibrate your Apple Watch to ensure it’s performing at its peak.


To calibrate your Apple Watch, ensure Location Services and Motion Calibration & Distance are enabled in your settings. Then, open the workout app and record a variety of outdoor walks and runs.


How to calibrate your Apple Watch

On a clear day, wear your Apple Watch to a flat, pedestrian-friendly, outdoor area with reliable GPS reception. If you have an Apple Watch Series 1 or earlier, you will need to bring your paired iPhone for connected GPS.

  • On your paired iPhone, open the Settings app, then scroll down to and tap Privacy. Tap Location Services and check to see if it is enabled. If not, tap the toggle.
  • On the same screen, scroll down to and tap System Services. Look for Motion Calibration & Distance and make sure it is enabled. If not, tap the toggle.
  • Open the workout app on your Apple Watch and begin an Outdoor Walk or Outdoor Run.
  • Begin walking or running, according to the workout chosen, and keep pace for 20 minutes.
  • When possible, repeat with the opposite workout.

Your Apple Watch continuously calibrates its accelerometer by tracking your steps and learning your stride length whenever you record a walk or run outside.

Why calibrating your Apple Watch matters

If you are hooked on tracking stats, you probably want them to be accurate. Calibration can improve the accuracy of your calorie calculations during a workout, plus influence the calorie, distance, and move calculations in your everyday activity. It can also keep data accurate when GPS is limited by helping the device learn your stride and fitness level. In short, learning how to calibrate your Apple Watch is simple, with long-lasting benefits.

Wearables are not perfect, however, and you may notice your Apple Watch counting steps when you are not walking. This could be because your heart rate is elevated and your arms are moving in a pattern that suggests activity such as walking or running. Fortunately, this should be a rare occurrence. Read our guide to the most common Apple Watch problems and solutions for more information about frequent device hiccups.

How to reset your calibration data on your Apple Watch

If you want to calibrate your device from a clean slate, you can reset your calibration data from your paired iPhone. This will permanently delete your current data and history and result in less accurate measurements until you calibrate again.

  • On your paired iPhone, open the Watch app.
  • Tap the My Watch tab, then scroll down to and tap Privacy. Tap Reset Fitness Calibration Data, and tap it again to confirm.
  • Follow the steps above for how to calibrate your Apple Watch.


No. You will need your paired iPhone to reset your calibration data.

As mentioned above, your device will continue to automatically calibrate over time. With this in mind, it’s important to always pick the correct workouts, and keep personal information such as weight, height, age, and gender up to date.

Your Apple Watch uses personal information such as your height, weight, age, gender, heart rate, and movement throughout the day to calculate how many calories you burn.

Absolutely. Wearing your Apple Watch too tight or loose can affect the accuracy of your heart rate sensor. Likewise, wearing your Apple Watch too high on your arm, or the underside of your wrist, will also affect accuracy.