About the Stress Tolerance Index

A Non-Clinical Metric

Please read this first. The Stress Tolerance Index is a non-clinical wellness metric. Its only purpose is to look at certain indicators of stress and mood based on your current conditions. It is not a validated clinical instrument, it has not been tested in published research, and it does not measure or detect any mental health condition. This self-check is not a diagnosis, and it is not a substitute for a qualified professional. Think of it as a dashboard light, not a mechanic's report.

Why “Load” and “Tolerance”?

The idea of a stress load has deep roots in science. Neuroscientist Bruce McEwen described how the body's stress systems can both protect us and, over time, wear us down. He used the term allostasis for the body's ability to stay stable through change, and allostatic load for the long-term toll of the body's response to stress (McEwen, 1998). The STI borrows this everyday picture of load and tolerance to help you reflect. It does not measure allostatic load or any biological marker.

How the Self-Check Works

What It Asks

The STI includes 20 short prompts, four in each of five areas:

• Body and nervous system, such as feeling tense or taking a long time to settle after stress.
• Sleep and recovery, such as trouble sleeping or not bouncing back on days off.
• Mind and focus, such as racing thoughts or mental fog.
• Mood and reactivity, such as feeling more irritable, numb, or quick to react.
• Daily life and connection, such as avoiding people or tasks, or feeling alone with the load.

Time Frame and Response Scale

You answer each prompt for the last 7 days, using a scale from 0 to 4: 0 (not at all), 1 (rarely), 2 (sometimes), 3 (often), and 4 (almost daily). There are no right or wrong answers.

Your Load Percentage

Your answers are added together (0 to 80 points) and shown as a stress load from 0% to 100%. The STI also shows how much of each area's maximum you are using, so you can see which area is driving your load. The highest bar is usually the best place to start. Results are grouped into four plain-language zones:

• 0%–25%: In your window. Keep doing what is working.
• 26%–50%: Load building. Maintenance will likely help more now than pushing through.
• 51%–75%: Running hot. A tune-up is strongly worth booking.
• 76%–100%: Overloaded. Prioritize a tune-up and support soon, and lean on your people.

Anything over 25% is a nudge to consider a tune-up. It is a signal, not a verdict. These zones and the 25% mark are practical guideposts chosen by Healing the Hero; they are not research-based cutoffs.

Tracking Over Time

The STI is most useful when you take it more than once, such as weekly, after a hard stretch, or after a tune-up. While the page is open, it keeps a simple trend of your check-ins so you can watch your load rise or fall, and you can download your own copy.

Limitations

Because the STI is non-clinical, its results should be read as a personal snapshot, not as evidence of any condition. A single week can be unusually hard or unusually easy, and the prompts cover only some of the ways stress shows up. Physical health, pain, medications, and shift work can all affect sleep, energy, and focus. If your load stays high, if it keeps climbing, or if you are worried about your mood, please talk with a qualified professional. For a closer look at specific concerns, Healing the Hero also offers the PCL-5, PHQ-9, and GAD-7 self-checks, which are widely studied screening tools.

How Healing the Hero Uses This Self-Check

The Stress Tolerance Index is free and confidential. It is scored entirely on your own device, and nothing you enter is sent anywhere, so your results stay private unless you choose to share them. If you would like support, reach out to Healing the Hero and a coach will connect with you within 24 hours to talk through your results, help you plan a tune-up, or connect you with peer support or a qualified professional.