How do I measure my height by myself?

Use the same wall method, but hold the flat object yourself: press it lightly on the crown of your head with both hands and slide it back until it touches the wall, keeping it level. Hold it in place, carefully duck out from under it, and mark the wall at its bottom edge. Because the object tends to tilt without a helper, repeat the measurement two or three times and average the results.

Why am I shorter at night than in the morning?

The discs between your vertebrae contain fluid. Gravity compresses them while you're upright during the day, and they rehydrate and expand while you lie down overnight. Most people are roughly one to two centimeters taller first thing in the morning than late in the evening. It's normal spinal compression, not a measurement error — which is why you should always measure at the same time of day.

Should I measure my height with or without shoes?

Always measure barefoot. Shoes add anywhere from under a centimeter to several centimeters depending on the sole, so readings taken in shoes aren't comparable to clinical measurements or to your own past readings. Also remove hats, thick socks, and bulky hairstyles or clips — anything between the crown of your head and the measuring surface gets counted as height.

How accurate is measuring height with a tape measure at home?

Done carefully, the wall-and-book method can get within a few millimeters to about a centimeter of a clinical stadiometer reading. The main error sources are a tilted headpiece, a chin pointed up or down, carpet underfoot, and a sagging tape. Using a hard floor, keeping the flat object level, holding the tape vertical and taut, and averaging two or three repeats keeps the number trustworthy.

Measuring Height

How to Measure Your Height Accurately at Home (5 Steps)

The Height Almanac · Updated 2026-07-19 · 4 min read

SummaryTo measure your height accurately, stand barefoot on a hard, level floor with your back to a wall, heels together and touching it. Look straight ahead with your chin level, place a flat rigid object — like a hardcover book — level on the crown of your head, mark where its bottom edge meets the wall, then measure from the floor to the mark with a taut, vertical tape measure. Repeat and average, and always measure at the same time of day.

Contents

How to Measure Your Height at Home

How to Measure Your Height at Home

To measure your height accurately, stand barefoot on a hard, level floor with your back against a wall, heels together and touching the wall. Look straight ahead, rest a flat object level on the crown of your head, mark where it meets the wall, then measure from the floor to the mark with a tape measure. Measure at the same time of day each time — height drops slightly as the day goes on.

That's the whole method. The rest of this guide covers each step, the mistakes that quietly add or subtract a centimeter, and how to do it solo.

What you need

A hard floor. Carpet compresses under your heels and can inflate the reading. Tile, wood, or laminate is best.
A wall with no baseboard bulge at the spot you'll stand, so your heels can actually touch it.
A flat, rigid object — a hardcover book, a box, or a carpenter's square. This is your stand-in for a stadiometer's headpiece.
A pencil and a tape measure (a metal one stays straighter than a sewing tape).

The 5 steps

Prepare. Take off shoes, socks with thick soles, hats, and bulky hairstyles or clips. Anything between your head and the flat object gets counted as height.
Stand correctly. Back to the wall, heels together and touching it. Your shoulder blades and buttocks should lightly touch the wall too. Legs straight, arms relaxed at your sides.
Level your head. Look straight ahead at eye level, not up or down. Clinicians aim for a position where the bottom of the eye socket and the top of the ear canal are roughly level with each other — in practice, "chin level, eyes forward" gets you there. Tilting the chin up is the most common error and it changes the reading.
Mark the wall. Have a helper press the flat object gently onto the crown of your head, keeping it level against the wall — not tilted. Mark the wall at its bottom edge, then step away.
Measure the mark. Run the tape from the floor straight up to the mark, keeping it vertical and taut. Read at eye level. Repeat the whole process once or twice; if readings differ, take the average.

Measuring by yourself

No helper? Same setup, one change at step 4: hold the flat object with both hands, press it lightly to the crown of your head, and slide it back until it touches the wall while keeping it level. Hold it in place, duck out from under it carefully, and mark the wall at its bottom edge. Solo readings are a bit less reliable — the object tends to tilt — so repeat the measurement two or three times and average.

A wall-mounted growth chart works the same way; the printed scale simply replaces the pencil mark.

Common error sources at a glance

Error source	Direction	Fix
Shoes or thick socks	Reads taller	Measure barefoot
Hair volume, buns, hats	Reads taller	Flatten or remove
Carpet underfoot	Reads taller	Use a hard floor
Chin tilted up	Reads taller or shorter	Eyes level, look straight ahead
Slouching or bent knees	Reads shorter	Heels, hips, shoulders to the wall
Tilted headpiece	Either	Keep the flat object level
Sagging tape measure	Reads taller	Keep tape vertical and taut

Why you're shorter at night

Your height genuinely changes over the day. The discs between your vertebrae contain fluid; gravity compresses them while you're upright, and they rehydrate and expand while you lie down overnight. Most people measure somewhere around one to two centimeters (roughly half an inch or a bit more) taller first thing in the morning than late in the evening. It isn't a measurement error — it's normal spinal compression.

The practical takeaway: always measure at the same time of day. Mid-morning to midday is a reasonable standard, since the fastest shrinkage happens in the first hours after getting up.

Tracking height over time

One careful measurement tells you where you stand today; repeated measurements under identical conditions tell you whether anything is changing. That matters most for kids and teens still on their growth timeline — see when people typically stop growing for the age ranges involved, and browse our growth science guides for what actually influences adult height. For adults, expect the number to be stable apart from that daily up-and-down; measure a few times and trust the pattern, not any single reading.