How to Measure Your Height Correctly at Home
A simple step-by-step to measure your height accurately using only a wall, a book, and a tape measure — without common mistakes.
To measure your height correctly: stand barefoot against a flat wall, heels together, look straight ahead, mark the top of your head with a book, and measure from the floor to the mark. Measure in the morning for the tallest, most consistent value.
It sounds simple, but most people measure wrong — and the error reaches 2 or 3 centimeters. Slouched posture, a soft rug under your feet, and measuring at night are the most common culprits.
Follow the step-by-step below and your measurement will match a doctor’s office reading.
Step by step
Pick the right spot
A flat wall and a level, hard floor (tile, wood, or concrete). Avoid rugs — they compress and steal up to 1 cm from the measurement.
Remove shoes and accessories
Barefoot, no thick socks. Remove clips, caps, or high buns that change the top of your head.
Position your body
Heels together against the wall, back and shoulders straight but relaxed, arms at your sides. Look straight ahead, chin parallel to the floor.
Mark the top of your head
Ask someone for help or use a hardcover book: rest it on the top of your head at a 90° angle to the wall and make a light pencil mark.
Measure from the floor to the mark
Use a tape measure, keeping it taut and vertical. Record in centimeters with one decimal place.
The best time to measure yourself
Always measure in the morning, right after waking up. During the day, gravity compresses the discs in your spine and you "shrink" 1 to 2 cm by nightfall. To track your height over time, measure at the same time — preferably in the morning.
Common mistakes that change the result
- • Measuring on a rug or carpet (compresses 0.5–1 cm)
- • Hunching your shoulders or tilting your head down
- • Wearing shoes or thick socks
- • Marking the forehead instead of the highest point of the head
- • Loose or tilted tape measure
- • Measuring at night and comparing with a morning measurement
Measuring children
For children under 2, the correct measurement is taken lying down (length), not standing. From age 2 onward, use the same step-by-step above — and record the date of each measurement to track the growth curve.
If the child’s curve drops in percentile consistently, it is worth talking to the pediatrician:
Frequently asked questions
Can I measure myself alone?
Yes, using a book against the wall as a marker. Accuracy is slightly lower than with help, but following the step-by-step keeps the error under 0.5 cm.
Why does my height change during the day?
The intervertebral discs compress under gravity throughout the day. It is normal to "lose" 1–2 cm between morning and night — it is not a sign of a problem.
Do phone apps measure height accurately?
Apps with LiDAR (recent iPhone Pro models) get close, but wall + tape measure remains the most reliable and cheapest method.