To measure your height accurately at home, stand barefoot with your heels, buttocks and shoulder blades against a wall, look straight ahead, rest a hardback book flat on your head, mark the wall where its underside meets it, and measure from the floor to the mark. Do it in the morning, an hour or so after you get up, and take the average of two or three readings.
That sounds obvious, but most “official” heights people quote are off by an inch or more. Shoes, slouching, the time of day and a tilted ruler all add or remove height. If you have ever asked how much height do shoes add, the honest starting point is knowing your real barefoot number first.
Why Your Height Reading Is Often Wrong
Height is one of those numbers people rarely measure properly. Most adults last had it checked at a doctor’s office years ago, and many simply remember the number they were told as teenagers. The common errors fall into a few groups:
- Shoes left on. Even thin trainers add around an inch. Boots and dress shoes can add more.
- Time of day. You are taller in the morning than in the evening. More on this below.
- Posture. Slumping or tipping your chin up changes the reading by a surprising amount.
- A tilted marker. If the ruler or book on your head isn’t level, the mark lands too high or too low.
- Thick carpet. Soft flooring lets you sink slightly, so readings come out short.
Step-by-Step: How to Measure Your Height at Home
This method mirrors the way clinics and national health surveys measure standing height. The CDC’s NHANES Anthropometry Procedures Manual, used for large US health surveys, follows the same basic steps: barefoot, heels together, back against a flat vertical surface and head in a level position.
- Pick the spot. Choose a flat, hard floor (not carpet) next to a flat wall with no door frame or bulky trim in the way. Most walls have a skirting board, which is fine: stand with your heels touching the skirting rather than the wall and keep your body upright. It only moves you forward slightly, and the reading stays accurate as long as the book sits level and square to the wall.
- Take off shoes and anything on your head. Remove hats, hair clips and buns that push your head forward. Thick socks should come off too.
- Stand correctly. Heels together and touching the wall, with your buttocks and shoulder blades also touching it if your body shape allows. Arms relaxed by your sides, weight spread evenly on both feet.
- Level your head. Look straight ahead so that the bottom of your eye socket and the top of your ear opening sit on an imaginary horizontal line. Clinicians call this the Frankfort plane. Don’t tip your chin up to gain height.
- Breathe in and stand tall. Take a deep breath and hold your posture without lifting your heels.
- Use a flat object. Have someone slide a hardback book, set square or clipboard down the wall until it rests firmly on the crown of your head, at a right angle to the wall.
- Mark and measure. Mark the wall at the underside of the book with a pencil, step away and measure from the floor to the mark with a metal tape measure held straight.
- Repeat. Do it two or three times and average the results. If the readings differ by more than about a quarter inch (roughly 0.6 cm), measure again.
Morning vs Evening: Why You Shrink During the Day
Your spine has about two dozen discs that act like water-filled cushions. While you are upright, gravity and movement squeeze a little fluid out of them. Lying down overnight lets them rehydrate, so you wake up at your tallest.
A well-known study by Tyrrell, Reilly and Troup, published in Spine in 1985, measured stature changes across the day and found people lost roughly 1% of their height (about 1.1% on average) by evening, with about half of that loss (54%) happening within the first hour after getting up. For a 5’10” (178 cm) adult, 1% is a little under three quarters of an inch (about 1.8 cm).
That is why measuring an hour or so after getting up gives a fair “standard” reading. Measuring straight out of bed gives your maximum, while late evening gives your minimum. Heavy lifting or a long run can shave off a bit more, temporarily.
Barefoot Height vs Height in Shoes
Doctors, height-tracking studies and most official forms use barefoot height. Dating profiles and casual conversations often don’t, which is part of why so many people seem to be “six feet”. The table below gives typical ranges for how much common footwear adds. Exact figures depend on the brand and model.
| Footwear | Typical height added | Notes |
|---|---|---|
| Thick socks | Under 0.25 in (under about 0.6 cm) | Small, but enough to skew a careful reading |
| Flat canvas trainers | About 0.5–1 in (1–2.5 cm) | Thin sole, minimal heel |
| Running shoes and chunky sneakers | About 1–1.5 in (2.5–4 cm) | Cushioned midsoles add more |
| Men’s dress shoes | About 1–1.25 in (2.5–3 cm) | Mostly from the heel block |
| Work boots and Chelsea boots | About 1.25–2 in (3–5 cm) | Chunky heels add the most |
| Height insoles or elevator shoes | About 1–3 in (2.5–7.5 cm) extra | On top of the shoe itself |
Remember that the heel lifts you more than the toe, so the useful number is heel height minus the thinner front of the sole, not the tallest point of the shoe. If you want to know what lifts realistically add on top of that, see our guide on whether height insoles actually work.
Common Mistakes That Skew the Result
- Measuring against a door frame. Frames often have a raised edge that pushes your heels or head off the wall.
- Using a soft tape measure. Cloth tapes stretch and sag. A metal tape or a fixed wall chart is more reliable.
- Reading the book’s top edge. Always mark the underside of the flat object, where it touches your head.
When to See a Doctor About Height Loss
Losing a small amount of height with age is normal, as spinal discs thin over decades. Losing a noticeable amount is worth checking. The Bone Health & Osteoporosis Foundation’s clinical guidance flags height loss as a warning sign, and it is worth talking to a doctor if you have lost 1.5 inches (about 4 cm) or more from your tallest adult height, because it can be a sign of spinal compression fractures caused by osteoporosis.
See a doctor sooner if height loss comes with:
- new or worsening back pain, especially sudden pain after a minor strain;
- a stooped or rounded upper back that is getting more pronounced;
- numbness, tingling or weakness in the legs.
A doctor can measure you on a calibrated stadiometer, which gives a far better baseline than home readings, and decide whether a bone density scan is appropriate. Simple habits such as good posture can help you stand at your full height, and our post on posture products that actually help covers what is worth trying.
FAQ
What time of day are you tallest?
First thing in the morning, after a night lying down lets your spinal discs rehydrate. Most people lose around 1% of their height by evening. Measuring straight out of bed gives your maximum; for a fair everyday “standard” reading, measure an hour or so after getting up, once most of that early drop has happened, according to research such as Tyrrell and colleagues’ 1985 study in Spine.
Is height measured with or without shoes?
Without. Doctors, health surveys and most official records use barefoot height. Shoes typically add somewhere between half an inch and two inches depending on the style.
How accurate is measuring your height at home?
Done carefully, a home measurement against a wall with a flat book and a metal tape can get close to a clinic reading, but it is not as precise as a calibrated stadiometer. Small errors from posture, a tilted book or soft flooring add up, so take two or three readings and average them. If they keep differing by more than about a quarter inch (roughly 0.6 cm), check your setup. For a medical baseline, ask to be measured at your next doctor’s visit.
Can you measure your height with a phone app?
Augmented reality measuring apps can give a rough estimate, but they are easily thrown off by lighting, camera angle and distance. For a number you want to rely on, use the wall method.
The Bottom Line
An accurate height reading takes five minutes: barefoot, back to a hard wall, head level, a flat book on top and a metal tape. Measure in the morning and average a few readings. Once you know your real barefoot height, you can judge honestly how much your shoes, or any lifts, are adding. If you notice you have lost 1.5 inches or more over the years, ask a doctor to check it.