Credit first, because this tool has a family tree. Nobody owns the feelings thermometer, but its oldest ancestor is the Subjective Units of Distress Scale, the self-rating that psychiatrist Joseph Wolpe introduced in 1969; a later validity study found that adults' distress ratings lined up with clinicians' separate judgments of how they were doing. Child therapists turned that number line into a picture a six-year-old could point at. Two classroom cousins are The Zones of Regulation, a trademarked curriculum created by Leah Kuypers, and The Incredible 5-Point Scale from Kari Dunn Buron. This page copies nothing from either and has no connection to or blessing from their authors.

What the thermometer is for

A child in the grip of a big feeling has almost no words. Ask what is wrong and you get a shrug, a scream, or "nothing." Ask where the red line is and you get a finger on a picture. A hard question (what are you feeling, and why) becomes an easy one (how big is it), and size is something even a four-year-old can judge.

"Calm down" is useless advice near the top of the thermometer and unnecessary at the bottom. A drink of water and a stretch may be plenty at Warm, while at Boiling the only plan worth having is a safe spot and a quiet adult. Sorting helpers by level keeps you from offering breathing exercises to a child who is far past them.

How this page works

There are five levels, Calm at the bulb and Boiling at the top, and they fit any large feeling: anger, worry, disappointment, even the over-excited kind of happy.

Fill in the key together. On an easy day, climb the levels one at a time. For each, ask your child what it looks like on them (fidgety hands, a loud voice, hiding) and what helps there. A level holds three signs and three helpers and refuses a fourth, because a hot head cannot read a long list. Begin with Calm; a child who knows what settled feels like in their body has somewhere to aim.

Take a reading. When a feeling shows up, let them tap a level or slide the red line. The card underneath returns their own helpers for that level, plus one sentence about what your job is at that height. Circle the helper you are going to try.

Log it. One tap records the level, the part of the day and the helper. Later you can mark whether it helped.

Read the strip. Five small thermometers, morning to bedtime, show how hot each stretch has run. After a handful of readings the page says whether one of them stands out. If it turns out to be the hour after school, you have a reason to try a snack or a quieter plan before that hour, instead of a consequence after it.

What the evidence says, and what it does not

No trial has tested a feelings thermometer by itself. What exists is evidence for the parts it is built from.

Putting a feeling into words seems to take some heat out of it. In a brain-imaging study with adults, labeling an emotion dampened the amygdala's response to upsetting pictures. A level on a thermometer is a very small word, but it is a word.

Thermometers like this one are standard tools in cognitive behavioral therapy for anxious children, and a Cochrane review covering eighty-seven trials concluded that such therapy probably raises recovery rates compared with no treatment. That speaks for whole programs run by trained people, not for a chart on the fridge.

What it cannot do is diagnose, measure or treat. The levels are your child's own words for their own experience, never a score.

Four ways it goes wrong

• Using it as a report card. "You hit Boiling three times today" turns a noticing tool into a shaming one. Every level is allowed.
• Teaching at the top. Nothing new goes in at Steaming or Boiling. Rehearse helpers at Calm and Warm so they are familiar by the time they are needed.
• Telling instead of asking. Announce "you're at Steaming" and you have taken the thermometer out of their hands. Ask, then accept the answer.
• Skipping your own reading. Children borrow calm from the nearest adult. Saying "I'm at Warm, I'm getting some water" out loud is the most persuasive demonstration you have.

When to use it

Set it up on a quiet weekend morning, not in the wreckage of a meltdown. Then take readings at unremarkable moments as well, so that pointing at the thermometer never becomes a sign that someone is in trouble. Teachers and counselors can keep one per child.

It pairs well with a place to go: a Calm Corner gives the Hot and Steaming helpers a home. If anger is the usual visitor, Steady the Flame teaches the long exhale that often ends up written on the Warm level, and for older children who want finer words than five sizes, The Feelings Wheel picks up where the thermometer stops.

If the log shows Boiling most days, or anyone is getting hurt, bring it to your pediatrician or a child therapist. A record of when, and how high, gives them something concrete to work from.