Garmin Stress Score: How Garmin Measures Stress and What Your Level Means (UK)

How does Garmin measure stress?

Your nervous system has two sides. The sympathetic side readies you for action (“fight or flight”): your pulse quickens and the gaps between beats become more even. The parasympathetic side takes over when you rest and digest, and the gaps vary more. Your Garmin reads both signals and estimates which side is in charge.

• The engine: Garmin says stress is estimated by its Human Performance Lab engine, mainly from heart rate and HRV. It builds on a 24-hour HRV method from Jyväskylä, Finland, home of Firstbeat Analytics, which Garmin bought in 2020.
• Only when you’re still: stress is scored while you’re inactive, never during exercise.
• Personal to you: the analysis adapts to your physiology, so the more you wear it, especially in bed, the more personalised it gets.
• It can’t tell you why: a deadline and pre-race nerves look the same.

What your Garmin stress score means

Garmin’s manual sets out four bands. On the stress chart, readings above 25 show as orange bars and readings below 25 as blue.

What is a good stress level on Garmin?

Garmin doesn’t publish a target average or a chart by age. Its advice is balance: offset stressful moments with relaxing ones and good sleep. In practice:

• Most of the night in the rest band is what you’d hope for, as sleep is when the rest-and-digest side is usually most active.
• Short orange spikes in the day are normal: a meeting, a phone call, the school run.
• Long stretches in medium or high, day after day, are worth noticing.

Compare with your own usual pattern, not a friend’s.

Exercise, stress and Body Battery

Garmin doesn’t measure stress during exercise, because the strain of exercise is itself a stress on the body and is tracked in other ways. Readings can still be higher for a while after a hard session, and Garmin lists excessive exercise as one cause of above-normal stress. Runners can read more in our guide to HRV and recovery.

Body Battery, Garmin’s estimate of your energy reserves, uses heart rate, HRV and movement, with stress as a main input:

• Stress 0 to 25: Body Battery charges, more strongly when your heart rate is lower and HRV higher than your usual baseline.
• Stress above 25: it drains, faster as stress rises.
• Sleep: the biggest recharge, though Garmin says illness, alcohol and lingering stress can stop you charging fully.

Why is my Garmin stress high?

Garmin names stimulants, excessive exercise, poor nutrition and illness as things that can raise readings. Research backs up several.

Why is my Garmin stress high at night?

Sleep is when the score is normally lowest, so a high night stands out. The usual suspects: an evening drink (see alcohol and sleep), a virus coming on, a late coffee (how long caffeine lasts), eating close to bedtime or a mind that won’t switch off (anxiety at night, tired but wired). Waking in the small hours too? See why you wake at 3am.

Why is my Garmin stress high for no reason?

There’s usually a reason, just not always a feeling. Google’s Fitbit help pages give standing up quickly, eating and public speaking as everyday triggers, and Garmin notes that happy excitement registers as stress too.

How accurate is Garmin’s stress score?

It’s a fair estimate of your body’s stress response, not a diagnosis.

• Not a medical device: Garmin says so plainly, and notes wrist heart rate can be less accurate depending on your physical characteristics and how the watch fits.
• Body, not mind: in a 2025 study of 60 adults wearing a Garmin vivosmart 4 and a chest strap ECG, the stress score rose during mental stress tasks and tracked ECG heart rate and HRV. But it only marginally predicted how stressed people said they felt; plain heart rate did better.

Use it to spot patterns. More in do sleep trackers work? and what your tracker’s deep sleep number means.

How to lower your Garmin stress score

What brings the score down is what the NHS recommends for stress. Expect changes over days and weeks.

1. Slow breathing. The NHS exercise: in through your nose for a count of up to 5, out through your mouth for 5, for at least 5 minutes a day. Some Garmin watches can alert you when stress is unusually high and start a relaxation breathing timer. Try box breathing or 4-7-8 breathing too.
2. Move during the day. The NHS says exercise won’t remove stress but can calm intense feelings.
3. Cut alcohol and late caffeine, which the NHS lists as unhelpful ways to cope.
4. Protect your sleep with a regular bedtime and wind-down (sleep hygiene). Our vagus nerve guide explains why slow breathing shifts HRV.
5. Try meditation. In a 2026 study where 90 people wore Garmin watches, regular meditators’ HRV rose by about 4.7ms during sessions and stayed up for at least 30 minutes. Start with a body scan.
6. Deal with the source. Talk to someone, share the load, say no. The stress bucket shows what’s filling your day; see also 15 ways to relieve stress and how to lower cortisol naturally.

Supplements and your evening routine

No supplement has been shown to lower a Garmin stress score or raise HRV, and we don’t claim ours do. Some adults simply like a drink or a few drops as part of a calmer evening.

• Magnesium Glycinate Sleep Complex: a berry drink with magnesium bisglycinate and citrate in a 4.75g scoop. Magnesium contributes to normal psychological function and to a reduction of tiredness and fatigue.
• Reishi Mushroom Adaptogenic Complex: a reishi hot chocolate. It contains a little natural caffeine from the cacao, so have it earlier in the evening.
• Flow CBD Oil: broad spectrum CBD with ashwagandha and maca for a daytime routine. Because it contains ashwagandha, it isn’t for anyone with a thyroid, liver or autoimmune condition, and don’t take it alongside another ashwagandha product.

The FSA’s 10mg a day figure is precautionary advice rather than a legal limit, set while longer-term safety research continues. At Evopure we think it is a very cautious figure, and many adults use more. If you go above it, increase slowly, and check with your GP or pharmacist first if you take any medication.

iIf you take any regular medicines, check with your GP or pharmacist first. We don’t recommend our products during pregnancy or breastfeeding. For adults (18+) only. For the trial evidence on specific ingredients, see supplements to lower cortisol.

Apple Watch, Fitbit and Oura: how they compare

Other wearables read similar signals but show them differently (checked on each maker’s support pages).

The scores aren’t interchangeable between brands.

When to see a GP

iGo by how you feel, not just the number. See your GP if:

• you’re struggling to cope with stress, or what you’re trying isn’t helping
• your sleep, mood or energy have been poor for weeks (see stress symptoms and burnout)
• your resting heart rate is much higher than usual and you feel unwell, or you notice palpitations