How wounds are measured at a visit

Knowing how wounds are measured makes visit notes much easier to follow. At most visits, the clinician measures the wound, often with a disposable paper ruler, records the numbers in centimeters and compares them with earlier visits. One inch is about two and a half centimeters.

Measuring is one part of a wider wound assessment that also covers the tissue in the wound, drainage, odor, pain and the surrounding skin.

What length, width and depth mean

You will usually see three numbers written in a set order: length, then width, then depth.

  • Length is the longest distance from top to bottom, in line with the body from head to toe.
  • Width is the widest distance from side to side, at a right angle to the length.
  • Depth is the distance from the skin surface to the deepest point of the wound base.

Some practices measure the longest distance in any direction first, then the widest distance at a right angle to it. Either approach works if it is used the same way every time.

Multiplying length by width gives a rough surface area. Wounds are rarely neat rectangles, so that figure is an estimate for comparison, not an exact size. Depth may be left blank when dead tissue covers the base and the true bottom cannot be seen.

Other terms you may see in your notes

  • Undermining is a shelf of open space under the skin edge, wider than the opening you can see.
  • Tunneling is a narrow channel running from the wound into deeper tissue.
  • Clock positions say where these are. Twelve o’clock points toward the head and six o’clock toward the feet.

Our page on tunneling and undermining wounds explains why these hidden spaces matter.

What photos add to the numbers

With your permission, the clinician may photograph the wound, often with a ruler or date label in the frame. Photos capture color, shape and the look of the skin in ways numbers cannot.

Photos have limits. Lighting, distance and angle change how a wound looks, and a camera cannot show depth well. If you send pictures between visits, our guide to telehealth and wound photos covers how to make them useful.

Why wound measurements change between visits

Numbers do not always move in a straight line. Common reasons include:

  • Debridement. After a clinician removes dead tissue, a wound often measures larger or deeper because its true size is finally visible. See what debridement is.
  • A different measurer or method. Two people can measure the same wound slightly differently.
  • Body position. Skin shifts when you lie on your back or side, sit or bend a joint, especially over the tailbone and hips.
  • Swelling. A swollen leg stretches a wound. When swelling goes down, the wound can measure smaller.
  • Irregular shape. A wound can fill in at one end while its longest length stays the same.
  • Healing from the base. Deep wounds often get shallower before they get narrower, as our guide to how wounds heal describes.

A wound that grows for none of these reasons, or keeps growing, needs the clinician’s attention. Our guide on why some wounds heal slowly covers what may be behind it.

Reading the trend, not a single number

One measurement is a snapshot. Clinicians look at several visits together and ask whether the wound is getting smaller, shallower and healthier. A wound that is the same size but has gone from yellow and dry to red and moist has made progress.

Questions to ask at a visit:

  • What were today’s measurements, and how do they compare with last time?
  • What kind of change would make you adjust the plan?
  • Can I have the numbers for my own records?

What to keep track of yourself

Write the date and measurements from each visit in a wound care visit notebook. For patients in Greater St. Louis and the Metro East, Gateway helps move records between the treating practice and your other clinicians so that primary care and wound care work together.

Between visits, report a wound that looks larger, a new opening nearby, more drainage, a new odor, darker tissue or increasing pain. Call 911 for heavy bleeding, trouble breathing or sudden confusion.

To ask about arranging a wound assessment, call 314-325-0126 or use the request care form, which collects contact details only.

Common questions

My wound is not getting narrower, but I was told it is improving. How can that be?

Size across the surface is only one measure. A deep wound usually fills from the bottom first, so depth may shrink while length and width hold steady. The tissue may also be healthier, with less dead tissue, less drainage and calmer skin around it. Ask the clinician to point out what has improved and what they expect to see next.

Two clinicians recorded different sizes for my wound. Which is right?

Possibly both. Small differences come from where each person judges the wound edge to be, how you were positioned and the method used. That is why the trend across several visits matters more than any pair of numbers. If the gap is large or confusing, ask the treating clinician to explain it.

Should I measure my wound at home?

Only if your care team asks you to, and then only in the way they show you. Never probe a wound or place anything in it. Your observations are often more useful than numbers: how much the dressing soaked, the color of the drainage, any odor, your pain and the look of the skin.

What do granulation, slough and eschar mean in my visit note?

They describe the tissue in the wound. Granulation is new, healthy tissue, usually red and bumpy. Slough is soft dead tissue, often yellow, tan or gray. Eschar is thicker dead tissue, usually brown or black and often dry and leathery. Notes may estimate how much of the wound each type covers, which is another way to track progress.

Related pages

General information to help you talk with your own clinician. It is not medical advice, and the treating clinician makes every clinical decision. For a medical emergency, call 911.

Updated October 2026