How to measure stress: 4 ways to check your stress level

Short answer

There is no single test that measures stress, so the most useful approach combines a short questionnaire with a body signal. The standard way to measure how stressed you feel is the Perceived Stress Scale (PSS-10): 10 questions about the past month, scored from 0 to 40, where 0–13 is usually read as low, 14–26 as moderate and 27–40 as high perceived stress (1). The most practical body signal is heart rate variability (HRV): a meta-analysis of 37 publications found that stress is most often linked to lower parasympathetic ("rest and digest") activity in HRV (2).

Cortisol tests exist, but they are not stress tests. Doctors use blood, saliva and urine cortisol tests to look for conditions such as Cushing syndrome and Addison's disease, and cortisol naturally swings through the day — highest early in the morning, lowest around midnight (3).

If you've been wondering whether you're "really" stressed or just bad at coping: you're not imagining it, and feeling stretched thin is not your fault or a sign of weakness. Stress is common, and measuring it is a sensible way to replace a vague feeling with something you can actually track.

Note: this article is for general education and is not medical advice. If you are in crisis or thinking about hurting yourself, call or text 988 in the US, or chat at 988lifeline.org (4). Chest pain, fainting or severe shortness of breath need emergency care: call 911 or your local emergency number. This guide is published by Welltory, which makes one of the apps mentioned. Welltory is a general wellness product: it helps you track and understand your data and does not diagnose or treat any condition.

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What are you actually measuring when you measure stress?

"Stress" is used for three different things, and each one is measured differently:

• The load — what is happening to you: deadlines, a sick parent, a move, money problems. The US National Institute of Mental Health describes stress as "the physical or mental response to an external cause," which can be a one-off event or something that keeps coming back (4).

• How it feels — whether life seems unpredictable, uncontrollable and overloaded. This is what questionnaires such as the PSS-10 measure (1).

• What your body does — the nervous system and hormone response: a faster heart, lower HRV, tense muscles, changes in sleep and in cortisol.

These three don't always move together. You can feel calm during a hard week while your body shows strain — or feel overwhelmed while your physical signals look fairly normal. That mismatch is itself useful information, which is why the best way to measure your stress level is to look at more than one layer.

Stress is also not the same as anxiety. NIMH explains that stress is usually a response to an external cause and tends to ease once the situation is resolved, while anxiety is more internal, involves persistent dread and can continue even without an immediate threat (4). The methods below can show that something is loading you; they cannot tell you whether you have an anxiety disorder.

4 ways to measure stress at a glance

Based on 1, 2 and 3.

Method 1: the Perceived Stress Scale (PSS-10)

The Perceived Stress Scale, developed by psychologist Sheldon Cohen, is one of the most widely used stress questionnaires in research. The 10-item version asks how often in the past month you felt things like being upset by something unexpected, unable to control important things, nervous and stressed, or confident about handling personal problems (1).

How to take the PSS-10

1. Pick a quiet moment when you're not in the middle of a crisis or an argument — you're rating the whole month, not the last hour.

2. Answer each of the 10 questions on a 0–4 scale: 0 = never, 1 = almost never, 2 = sometimes, 3 = fairly often, 4 = very often.

3. Reverse four items. Questions 4, 5, 7 and 8 are worded positively (feeling confident, things going your way, being able to control irritations, feeling on top of things). For those, flip the score: 0 becomes 4, 1 becomes 3, 2 stays 2, 3 becomes 1 and 4 becomes 0 (1).

4. Add up all 10 scores. The total runs from 0 to 40.

5. Write down the date and the number, plus one line about what was going on that month.

What your PSS-10 score means

• 0–13 — Low perceived stress

• 14–26 — Moderate perceived stress

• 27–40 — High perceived stress

Two things to keep in mind. First, these bands are a convention for describing scores, not a diagnosis — a high score doesn't mean something is wrong with you, and a low one doesn't mean you have nothing to deal with. Second, the scale is most useful compared with yourself: taking it once a month and watching whether the number goes up or down tells you more than any single result.

The perceived stress scale's main weakness is that it relies on memory and mood. On a bad day, the whole month can look worse than it was. That's why pairing it with a body signal helps.

Method 2: heart rate variability (HRV)

HRV is the variation in time between heartbeats. When you're relaxed, the parasympathetic branch of the nervous system keeps the gaps between beats changing slightly; under stress, the sympathetic "fight or flight" branch takes over and the rhythm becomes more even.

The research backs this up, with caveats. In a meta-analysis and review of 37 publications, the most frequent finding under stress was "low parasympathetic activity," seen as a drop in high-frequency HRV and a rise in low-frequency HRV. The authors concluded that HRV is affected by stress and supports its use for objective assessment of stress — but they also noted that results were inconsistent between studies and that there is no universally accepted standard for evaluating stress (2).

That's why HRV works best as a personal trend, not a verdict. A single low reading can come from a short night or a glass of wine; a reading that stays below your own normal for a week alongside a high PSS score is a much clearer signal.

How to measure stress with HRV at home

1. Choose a tool. A phone camera app (a fingertip over the camera and flash), a chest strap, a smartwatch or a ring. We compare the options in stress monitoring devices compared.

2. Measure at the same time every day, ideally in the morning after you wake up and before coffee, exercise or scrolling the news.

3. Use the same position each time — sitting or lying — and breathe normally rather than slowly on purpose, which can push HRV up.

4. Stay still. Movement and talking disturb the reading.

5. Collect two to three weeks of readings before you decide what "your normal" is.

6. Look at the weekly average, not at one day.

Many factors other than stress change HRV — breathing, age, body weight, smoking and medicines such as beta-blockers among them (2). Alcohol, a late meal, poor sleep, a cold or a hard workout the day before will also lower it. Noting those things next to each reading is what turns HRV into a stress measurement rather than noise. If you don't wear a watch, our guide on how to measure HRV without a wearable explains the camera method step by step.

What "stress scores" on watches are

Several wearables turn HRV into a simple stress number. Garmin, for example, says its devices analyze your heart rate variability while you are inactive and show a stress level from 0 to 100: 0–25 is "resting," 26–50 "low," 51–75 "medium" and 76–100 "high" stress. Garmin also notes that training, physical activity, sleep, nutrition and general life stress all affect the score (5). (Checked on Garmin's manual pages as of November 2026.)

These scores are useful for spotting patterns across a day — a spike during your commute, a calm stretch after a walk. But each brand uses its own formula, so numbers aren't comparable between devices, and a high "stress" reading can be caused by caffeine, a warm room or digestion just as easily as by a difficult email. If you use an Apple Watch, we explain what it can and cannot show on our Apple Watch stress page.

Method 3: resting heart rate

Your resting heart rate is the simplest body signal you can check without any gadget. Stress hormones speed the heart up, so a resting pulse that sits several beats above your usual level for days can be one sign that you're under strain — though illness, dehydration, poor sleep, caffeine and alcohol do the same.

How to use resting heart rate as a stress check

1. Take your pulse in the morning before getting up: two fingers on the inside of your wrist, count for a full 60 seconds. Our guide on how to check your pulse shows the exact spot.

2. Repeat on most mornings for two weeks to learn your normal range.

3. Watch for a sustained rise, not a single high day.

4. Cross-check with your notes. If the rise lines up with a deadline, conflict or bad sleep — and not with a cold — stress is a likely contributor.

Resting heart rate is less sensitive than HRV, but it's free, needs no app and is hard to get wrong. If your resting pulse stays high without an obvious reason, our article on high resting heart rate causes covers what else to consider.

Method 4: cortisol tests — and why they are not stress tests

Cortisol is often called "the stress hormone," so it's natural to search for how to measure cortisol levels. Tests are available, but it's worth knowing what they're for.

What cortisol tests are used for. Cleveland Clinic describes the cortisol test as a way to help diagnose conditions such as Addison's disease (too little cortisol), Cushing syndrome (too much cortisol) and certain tumors that raise cortisol (3).

The three types:

• Blood test — a standard draw from a vein, usually in the morning.

• Saliva test — usually done at home, collected right after waking or late at night, then returned to the lab.

• 24-hour urine test — you collect all urine for a full day at home and drop it off at a lab (3).

Why a single result says little about everyday stress. Cortisol levels are usually highest early in the morning, decline through the day and reach their lowest around midnight (3). Cleveland Clinic gives typical blood ranges of about 10–20 mcg/dL between 6 and 8 a.m. and about 3–10 mcg/dL around 4 p.m., while noting that ranges vary by lab, time of day and person. The same page even advises resting before the test "so that stress doesn't affect the results" — which shows how quickly cortisol reacts to the moment, rather than summing up your month (3).

So a cortisol test makes sense when a doctor suspects a hormone problem — for example, unexplained weight changes, very high blood pressure, or deep fatigue with dizziness. It is not a reliable way to answer "how stressed am I?" If you're considering supplements marketed for "cortisol," read our guide to supplements for stress and cortisol first.

A two-week plan to measure your stress level

Combining the methods takes about five minutes a day. Here is a simple routine:

1. Day 1: take the PSS-10 and write down your score.

2. Every morning: take one HRV reading (or your resting pulse) at the same time, sitting or lying the same way.

3. Every evening: rate your day from 1 to 10 for stress and note one or two things that happened — "presentation," "argument," "slept 5 hours," "two coffees after 3 p.m."

4. Day 14: compare your best and worst days. Did low HRV mornings follow late nights, alcohol or tense days? Did your evening ratings match your morning numbers?

5. Day 30: take the PSS-10 again and compare it with your first score.

At the end you'll have three pieces of evidence: how stressed you felt, how your body responded and what tends to come before the hard days. That's far more useful than any single "stress level test."

Common mistakes when measuring stress

• Treating one number as the truth. One low HRV reading or one high PSS score is a data point, not a diagnosis.

• Comparing yourself with other people. HRV varies a lot between individuals and with age. Your own trend matters more than someone else's number.

• Measuring at random times. A reading after lunch and one before breakfast are not comparable.

• Ignoring the obvious confounders. Alcohol, illness, late meals, a hard workout and short sleep all look like "stress" in body signals.

• Breathing slowly on purpose during a reading. It's a good relaxation technique, but it will make your HRV look higher than your normal resting state.

• Buying a cortisol kit to check everyday stress. Because cortisol follows a strong daily rhythm and reacts to the moment, a single home sample can't sum up your month (3).

• Only measuring when you feel bad. Without calm-day readings, you have nothing to compare with.

Which method should you use?

• You want to know if you're more stressed than usual: PSS-10 once a month plus morning HRV or resting pulse.

• You suspect stress is affecting your sleep or energy: daily HRV with short notes; compare your best and worst weeks.

• You want to see which situations trigger you: a wearable stress score across the day, read as a pattern rather than as exact numbers. Our article on emotional vs physical stress helps you sort the two.

• You feel wired but can't switch off even when things are calm: track HRV in the evening as well as in the morning; see why your body still feels stressed when you can't relax.

• You have symptoms such as unexplained weight change, very high blood pressure or dizziness: talk to a doctor about whether hormone tests, including cortisol, are needed.

Living with stress: the questions people ask next

Am I stressed or just tired?

Often both. Tiredness from a short night tends to improve after one or two good nights of sleep. Stress tends to persist: you may sleep enough hours and still wake up tense, with a higher resting pulse or lower HRV than usual. Tracking sleep alongside your PSS score and morning readings helps you tell them apart.

Can a smartwatch tell if I'm stressed?

It can show body signals that often go with stress — lower HRV and a higher heart rate while you're inactive. It can't know why. Exercise, caffeine, heat, digestion and illness produce the same signals, so treat a watch stress score as a prompt to ask "what just happened?" rather than as a measurement of your emotions (5).

Is there a blood test for stress?

No single blood test measures stress. Cortisol tests are used to check for hormone conditions such as Cushing syndrome and Addison's disease, and cortisol levels change through the day and in response to the moment (3).

What does a low HRV mean for stress?

A lower-than-usual HRV means your nervous system is leaning toward "fight or flight" at the moment of the reading. Stress is one possible cause; poor sleep, alcohol, illness and hard training are others (2). A low HRV that lasts for a week or more, alongside feeling stretched, is worth paying attention to.

How often should I measure my stress level?

A practical rhythm is the PSS-10 once a month and a short HRV or pulse reading most mornings. Measuring more often rarely adds information and can turn into a source of stress in itself.

Before you blame yourself

When you feel constantly on edge, it's easy to decide the problem is you — that you're weak, disorganized or "bad with stress." Before you blame yourself, look at your data. Stress has visible causes, and they often show up in the numbers before you name them: three short nights in a row, a week of late meetings, a resting pulse that crept up after you started skipping lunch.

Pick one lever you can actually change for the next one to two weeks — a fixed bedtime, no caffeine after noon, a 15-minute walk after work — and keep measuring. If your HRV or resting pulse moves in the right direction, that's a sign the change may suit your body — keep it and test the next one. If nothing changes, that's useful too: it's a sign the load may be bigger than one habit can fix, and that it's worth getting support.

When to see a doctor

Talk to a doctor or a mental health professional if stress is interfering with your work, relationships or sleep for weeks, if you're avoiding things you used to do, or if your symptoms seem always present (4). Also see a doctor if you have physical symptoms you can't explain, such as a resting pulse that stays high, palpitations, unexplained weight changes or very high blood pressure.

Get help now if you are in crisis or thinking about hurting yourself: call or text 988 in the US, or chat at 988lifeline.org (4). Chest pain, fainting or severe shortness of breath need emergency care: call 911 or your local emergency number.

How to bring this up with your doctor

What to ask for, by name. "I'd like to talk about stress and whether it could be anxiety." If you have physical symptoms: "Is there anything we should rule out, such as thyroid or hormone problems?" If you're curious about cortisol: "Do my symptoms justify a cortisol test, and which type?"

What to bring. Your PSS-10 scores with dates, two to four weeks of morning HRV or resting pulse readings, your sleep times, and a short list of what was going on — work, family, health, caffeine, alcohol and any medicines or supplements.

What to say, out loud. "For the past [number] weeks I've felt [tense/overwhelmed/on edge] most days. My stress score went from [number] to [number], and my resting pulse has been about [number] beats higher than usual."

If you feel brushed off. Ask: "What would make this worth looking into further?" and "Could you refer me to someone I can talk to about stress?" NIMH notes that talk therapy and medication are the main treatments for anxiety, and many people benefit from both (4).

How Welltory helps — and what it cannot do

The limits first. Welltory is a general wellness product, not a medical device. It does not diagnose stress disorders, anxiety or hormone conditions, and it does not measure cortisol.

What it can do is give you a consistent body signal to put next to how you feel.

A stress reading from HRV. Welltory calculates its stress and energy scores from heart rate variability — the variation in the intervals between heartbeats (stress and energy).

A spot reading with your phone camera. You place a fingertip over the camera and flash for a short, deliberate measurement — this is a spot reading, not 24/7 monitoring. Not every phone works: the Help Center lists many iPhone and Samsung models as suitable and all Google Pixel models as unsuitable for camera readings. Free accounts get one camera or heart rate monitor measurement per day (camera measurements). For the most comparable readings, measure at the same time each morning (accurate HRV measurements). You can also connect a supported heart rate monitor or watch (compatibility).

Tag what happened. On iOS, when Welltory detects a stress or recovery episode and asks "What happened?", you can tap a suggested tag, type, or answer by voice — "deadline," "argument," "bad night," "two coffees" — so patterns build up over time (My Patterns).

A record to share. From the web app you can export your data as CSV and bring it to an appointment (export guide).

Use these alongside the PSS-10: Welltory shows how your body signals change, the questionnaire shows how the month felt, and looking at both helps you decide where to start.

How we made it

We based this article on the Perceived Stress Scale scoring guide from Georgetown University's Healthy Aging measures library, a meta-analysis of stress and heart rate variability published in Psychiatry Investigation, Cleveland Clinic's guide to cortisol tests, the National Institute of Mental Health's fact sheet on stress and anxiety, and Garmin's device documentation for its stress level feature. Search questions came from what people in the United States most often ask about how to measure stress. For the product section, we checked every function against the Welltory Help Center on November 6, 2026.

Made with AI tools, then edited and fact-checked by the Welltory team. See our Editorial & AI policy.

Jane Smorodnikova, co-founder of Welltory, built the methodology behind how we read physiological data.

Written by Tatsiana Yashyna.

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