This post contains affiliate links. As an Amazon Associate I earn from qualifying purchases.

You've hung the chart, your child is (mostly) standing still, and you're holding a random book over their head wondering if it's straight. That's how a lot of first measuring days go. A small kit of growth chart marking supplies, kept in one pouch and used the same way every time, turns that guesswork into a routine you can repeat for years. Below is what to put in it, how to use each piece, and a printable checklist to run before every mark.

What goes in a growth chart marking kit

In short: eight everyday items, and you probably own half of them already.

None of this is specialty gear. Anything you're missing is in a hardware or office-supply aisle.

Keep the pouch near the chart but up high, on a shelf or in a closed drawer. A retracting tape measure snaps back fast and a sharp pencil isn't a toy, so the kit stays out of small hands between sessions. If you also measure at a grandparent's house or a second home, a second small pouch there saves you from packing the first one.

What to use to mark a growth chart

In short: a light pencil tick first, then the right permanent pen for your surface.

Make every mark in two steps. Draw one small, light pencil tick under the headpiece, check it, and only then ink the final reading. A sharp tip matters more than you'd think: a dull pencil leaves a fat smudge, and years later you won't know which edge was the real reading. Since a canvas chart can't be washed, keep that tick tiny, and lift any pencil that still shows with a soft white or kneaded eraser, tested on the back of the canvas first.

For siblings, give each child their own ink color and write the color key on the first page of your notebook. Nobody has to guess whose line is whose later.

If you haven't chosen a chart yet, both of our canvas growth charts ($44 each) are 100% cotton canvas and come with a fabric-safe pen or marker, so that line of the list is covered. They also start at the 6-inch mark, which keeps the scale above the baseboard.

Canvas Kids Growth Chart

$44.00

View the Canvas Kids Growth Chart

How to get a straight, accurate mark

In short: the headpiece and level do the real work. A book that tips even slightly toward your child's face is the easiest way for a home mark to drift.

1. Stand on a hard floor. Shoes off, feet flat, heels together and touching the wall right in front of the chart.
2. Line up the back. Heels, bottom and shoulder blades against the wall, and the back of the head too if it reaches. Arms hang loose.
3. Level the eyes. Ask your child to look straight ahead, not up at you. Tipping the chin up or down shifts where the top of the head sits.
4. Lower the headpiece. Slide the book down the wall, spine flat against it, until it rests firmly on the crown. Press through the hair to the scalp, not just onto the hair.
5. Check the bubble. Set the level on top of the book and adjust until the bubble is centered. Lay the level so it points straight out from the wall, front to back, which is the tilt that matters most. With a speed square, keep one edge flush to the wall and use the level as a quick double check.
6. Tick once, then step out. Make one small pencil tick along the underside of the headpiece. Hold the book still while your child ducks forward and out, so it doesn't drag the line.
7. Take a second reading, not a second tick. Have your child step back in and repeat steps 2 to 5. This time, don't tick again. Read the height at the underside of the headpiece off the chart's scale, or hold the tape there if the scale only marks whole inches. If it lands within about 1/4 inch of your tick, the tick stands. If it's further off, take a third reading the same way and go with the two that agree.
8. Cross-check and ink the final reading. Run the tape measure from the floor to your final reading to confirm it. If the numbers agree, ink the final reading and write the date or age beside it. If a third reading moved you off your tick, lift the stray tick with your soft eraser first.

House rules that keep every mark comparable

In short: the tools only help if the conditions match each time. Write these on the inside cover of the notebook.

• Shoes off, every time. Choose bare feet or thin socks and stick with it. Shoes add height, and sneakers and slippers add different amounts.
• Hair down and flat. Take out buns, high puffs, clips and headbands. If a style can't come down that day, note it in the log.
• Same time of day. People are a little taller in the morning than at bedtime, because the spine settles as the day goes on. Measuring right after breakfast is easy to repeat.
• Same spot, same headpiece. Use the same book or square every session, and keep it in the pouch so it doesn't wander back to the bookshelf.
• Same measurer when you can. Two adults may press and read slightly differently. If you swap, note who measured.
• Set dates, not whenever. Once or twice a year is plenty for most kids. Our guide to how often to measure your child's height suggests easy dates to anchor to.

Check the chart before you check your child

A perfectly level headpiece can't fix a chart that has slipped. Spend 30 seconds on the chart itself before each session.

• Measure the bottom line. Run the tape from the floor to the chart's first printed line. On a chart that starts at 6 inches, that should read exactly 6 inches.
• Measure from where your child stands. On thick carpet, heels sink in. A hard floor gives steadier results; if carpet is your only option, use the same spot every time and write "carpet" in the log.
• Check the hang. The nail or hook should be snug, and the chart should hang straight without bunching behind furniture.
• Keep nurseries safe. Hang the chart on a wall away from the crib, never above it, and make sure it's secure.

If the bottom line has shifted, re-hang the chart before you mark and note the date in your log, since marks made while it was off will be off by the same amount. Still choosing a wall? Our guide to where to hang a growth chart covers hallways, closet doors and other spots with room to stand.

The backup notebook: why ink on canvas isn't enough

In short: a written log means a move, a spill or a misread line can't erase years of records.

The chart is the keepsake. The notebook is the insurance. Give each measurement one line with these details:

• Date and time of day
• Child's name and age in years and months
• Height to the nearest 1/4 inch (1/8 if your tape and patience allow)
• Notes: socks or bare feet, floor type, who measured, anything unusual

A finished entry might look like this:

"Jan 1, 9:00 a.m. · Theo · 4 yrs 1 mo · 41 1/2 in · bare feet, hallway hardwood, two readings matched"

After you ink each mark, take a close photo of it, plus one wide photo of the whole chart once a year. If the chart ever gets creased or soaked, our guide to repairing a growth chart damaged in a move can help, and your log lets you transfer every mark to a new canvas with exact numbers instead of guesses.

Quick fixes for measuring-day snags

• A toddler who won't stand still. Use two adults: one holds the headpiece and level, the other handles the pencil. Have everything ready before your child steps in, and turn it into a freeze-like-a-statue game.
• A wrong mark in ink. Don't scrub it. Neither of our canvas charts can be washed. Make the correct mark, date only that one, and write in the log which line is real.
• A baby who can't stand yet. Pediatric offices usually measure babies lying down until about age 2. Copy those lengths into your notebook, and add the first wall mark once your child can stand steadily against the wall.
• A mark that doesn't match the doctor's. Different tools, posture and time of day all shift a reading a little, so small gaps are normal. The wall chart is a keepsake. For questions about growth, your pediatrician is the right place to start, and the AAP's parent site, HealthyChildren.org, is a good next stop.

Printable pre-measuring checklist

Keep a copy of this checklist with the kit: print it and fold it into the pouch, or save a screenshot on your phone. Run down it before every mark, and a mark made years from now will be made exactly the way the first one was.

Gather the kit

• ☐  Same headpiece as last time (hardcover book or speed square)
• ☐  Small level or phone level app
• ☐  Sharp pencil and a soft white or kneaded eraser
• ☐  Fabric-safe pen in this child's color
• ☐  Tape measure
• ☐  Notebook, open to the last entry

Check the chart

• ☐  Bottom printed line sits at its stated height above the floor
• ☐  Hook secure, chart hanging straight
• ☐  Same spot on the same floor as last time

Ready your child

• ☐  Shoes off, same socks-or-bare rule as last time
• ☐  Hair down: no buns, clips or headbands
• ☐  Same time of day as usual
• ☐  Heels, bottom and shoulders against the wall, eyes straight ahead

Make the mark

• ☐  Level pointing straight out from the wall, bubble centered before the one pencil tick
• ☐  Second reading taken off the scale or tape (no new tick), within about 1/4 inch of the tick
• ☐  Chart reading matches the tape measure
• ☐  Final reading inked, with the date or age beside it
• ☐  Any leftover pencil lifted with the soft eraser
• ☐  Entry logged with notes
• ☐  Close photo taken
• ☐  Kit back in the pouch, up high

You don't need special equipment to measure well, just the same few tools and the same few rules every time. Put the pouch together before your first measuring day, keep this checklist inside it, and every line on the chart will be one you can trust.

Frequently asked questions