Launch Apple Health > Tap on 'Health Data' > 'Vitals' > 'Heart Rate' > 'Show All Data'
To use the Calorie-burn calculator, you need to measure your heart rate after you've exercised, tag it as an "Active Heart Rate" (choose "Active" in the Save prompt when your heart rate measurement is complete), and enter an exercise duration (in minutes). In addition, you'll need to have a recent Resting heart rate measurement for a baseline.
Please check to make sure the settings are right:
If you have "Active" measurements recorded today, your calories should be displayed. NOTE: If the measurements were in the past 7 or 30 days, you need to swipe the top gray panel ("TODAY") to the left to view them.
Other things to consider:
Here are some very important tips:
Sometimes it takes some experimenting to learn the best way and distance to hold your iPhone/iPad. Here are some important tips:
There are a couple of possibilities: