Smartwatches have become a daily fitness companion for millions across the world, promising insights into calories burned, heart rate, sleep, and recovery. But what if your fitness tracker data is not as accurate as you think? Experts warn that while wearable technology is useful, many of its metrics are estimates - not precise measurements.

If your watch ever told you to skip a workout despite feeling great, you are not alone. Let’s break down why smartwatch accuracy issues can mislead your fitness decisions.

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Devices like theApple WatchandFitbituse sensors to estimate activity. While they do not directly measure most metrics, they rely completely on algorithms combining movement, heart rate, and personal data. This means your step count, calories, and recovery scores are educated guesses, not exact numbers.

Calorie tracking is one of the most used features - but also one of the least accurate. Devices can overestimate or underestimate calories by over 20 per cent, and errors increase during strength training or high-intensity workouts. It is important because if your watch overestimates calories, you might eat more and gain weight. If it underestimates, you may underfuel your body, affecting performance.

Experts say step tracking depends heavily on arm movement, not just walking.

Smartwatches measure heart rate using optical sensors that track blood flow in your wrist. While fairly accurate at rest, they become less reliable when you sweat heavily, exercise intensity increases, and the watch is worn loosely.

According to doctors, it can affect your heart rate zone training, leading you to train too hard or too easy.

Smartwatch data becomes less reliable when you sweat heavily, exercise intensity increases, and the watch is worn loosely

Experts say most devices provide sleep scores and stages – light, deep, REM. However, unlike lab tests like Polysomnography, smartwatches only estimate sleep based on movement and heart rate. As a result, they can detect sleep duration fairly well but often misjudge sleep quality and stages.

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