How to Measure Your Height at Home

Common Reasons People Measure Their Height

There are 8 common reasons people measure height at home:

Factors That Affect Height Readings

Six factors change your measured height by 0.5 to 4 cm (0.2 to 1.6 inches) depending on conditions.

1. Time of day. Spinal disc compression reduces height by 1 to 2 cm (0.4 to 0.8 inches) between morning and evening. Intervertebral discs absorb water overnight and lose it under gravitational load throughout the day.

2. Footwear. Shoes add 1 to 4 cm (0.4 to 1.6 inches) depending on sole thickness. Running shoes add approximately 2.5 cm (1 inch). Boots add 3 to 4 cm (1.2 to 1.6 inches). Measure barefoot or in thin socks.

3. Posture. Slouching removes up to 2 cm (0.8 inches). Stretching upward artificially adds up to 1 cm (0.4 inches). Natural upright posture gives the true reading.

4. Floor surface. Carpet compresses under body weight and absorbs 0.5 to 1 cm (0.2 to 0.4 inches) of the measurement. Thick rugs compress more. Measure on tile, hardwood, laminate, or concrete.

5. Hair volume. Thick, tall hairstyles (afros, buns, teased styles) can add 1 to 5 cm (0.4 to 2 inches) of apparent height. Flatten hair or place the headpiece directly on the scalp.

6. Head tilt. Tilting the head back raises the crown and adds up to 1.5 cm (0.6 inches). Tilting forward lowers it. Keep your chin parallel to the floor for a neutral head position.

Essential Items

Three tools produce an accurate home height measurement:

A metal tape measure holds straight against the wall without sagging. Fabric and sewing tapes flex and droop, producing readings that are 0.3 to 1 cm (0.1 to 0.4 inches) short of actual height. Buy a 25-foot (7.6-meter) locking tape measure for $5 to $10 at any hardware store.

Best Alternatives if You Don't Have Measuring Equipment

Five substitute methods work when you lack standard measuring tools:

The string method is the most accurate substitute, producing readings within 1 cm (0.4 inches) of a tape measure, provided you measure the string carefully. Smartphone apps are the least accurate, especially for heights above 170 cm (5 ft 7 in) where the camera angle creates parallax error.

Step 1: Prepare the Measuring Area

Find a flat wall with a hard floor and no baseboard. The wall must be smooth and vertical. Textured walls with protruding stone or brick prevent accurate back contact. A baseboard pushes your heels forward from the wall and angles your body, reducing the reading by 0.5 to 1 cm (0.2 to 0.4 inches).

Choose a spot with no picture frames, shelves, or wall-mounted objects at head height. You need clear wall space from floor to at least 15 cm (6 inches) above your estimated height.

Remove shoes, thick socks, hair ties, buns, hats, and anything on top of your head. Shoes add 1 to 4 cm (0.4 to 1.6 inches). Even thin socks on carpet compress inconsistently. Bare feet on hard floor is the standard.

Step 2: Position Your Body Correctly

Stand with 4 points touching the wall: heels, buttocks, shoulder blades, and the back of your head. Not everyone can touch all 4 points at once due to body shape. People with a larger buttocks or upper back curvature (kyphosis) may only achieve 3 contact points. Touch as many as possible without straining.

Place your feet flat on the floor with heels together and toes pointing slightly outward at a 60-degree angle. Keep legs straight but not locked. Weight should distribute evenly between both feet.

Look straight ahead at a fixed point on the opposite wall. Your chin should be parallel to the floor. This is called the Frankfurt Plane (also called the Frankfort Horizontal): an imaginary line from the bottom of the eye socket to the top of the ear canal runs horizontal. Clinicians use this exact head position for standardized anthropometric measurements.

Step 3: Mark Your Height

Place a flat, rigid object on top of your head so it touches the wall at a right angle. A carpenter's level is ideal because you can verify it sits level. A hardcover book or set square also works. The object must be stiff enough that it does not bend under its own weight.

Press the flat object against the wall while it rests on the crown of your head. Do not press it into your hair or tilt it. The bottom edge of the object where it contacts the wall is your height mark.

Make a light pencil mark on the wall at the bottom edge of the headpiece. Use a helper for easier marking, or hold the headpiece in place with one hand and mark with the other. Do not move your head while marking.

Step 4: Measure and Record the Result

Step away from the wall and measure from the floor to the pencil mark with a metal tape measure. Hook the end of the tape on the floor (or press it flat against the floor-wall junction). Extend the tape straight up the wall to the pencil mark. Read the measurement at eye level to avoid parallax error.

Record the measurement in your preferred unit. For imperial: read feet and inches (e.g., 5 ft 7 in or 67 inches total). For metric: read centimeters (e.g., 170 cm). Convert between units using the formula: inches x 2.54 = centimeters, or centimeters / 2.54 = inches.

Measure 3 times and use the average. Three readings that vary by more than 0.5 cm (0.2 inches) indicate a positioning error. Repeat the process. Three readings within 0.5 cm of each other confirm accuracy. Add the three results and divide by 3 for your final height.

Head Position (Frankfurt Plane)

Align your head in the Frankfurt Plane: the lower border of the eye socket and the upper margin of the ear canal form a horizontal line. In practice, this means looking straight ahead with your chin parallel to the floor. Do not tilt your head up (adds height) or down (subtracts height).

Pick a point on the opposite wall at eye level and stare at it during measurement. Your jaw should be relaxed, mouth closed, teeth together. This position is the international standard defined by the International Society for the Advancement of Kinanthropometry (ISAK) for all standing height measurements.

Shoulder and Back Alignment

Relax your shoulders downward and press your shoulder blades against the wall. Do not pull shoulders back forcefully or puff out your chest. The goal is a natural upright posture, not a military "attention" stance. Forcing the shoulders back arches the lower spine and can add 0.5 cm (0.2 inches) artificially.

Your upper back (between the shoulder blades) should contact the wall. People with significant thoracic kyphosis (forward rounding of the upper back) may not achieve this contact. In that case, press the flattest part of your upper back against the wall and keep your head in the Frankfurt Plane.

Foot Placement

Place both heels together against the wall with feet flat on the floor. Toes point outward at approximately 60 degrees (a natural V-shape). Distribute weight evenly across both feet. Do not lean to one side.

Do not stand on tiptoes, raise one heel, or curl toes. Each foot should make full ground contact from heel to ball to toes. Standing on tiptoes adds 3 to 7 cm (1.2 to 2.8 inches) and produces a completely invalid measurement.

Using a Wall and Measuring Tape

The wall-and-tape method is the standard home height measurement technique. Stand against a flat wall on a hard floor, place a flat rigid object on your head touching the wall at 90 degrees, mark the wall, and measure from the floor to the mark. This is the same 4-step process detailed above.

For improved accuracy, attach the tape measure to the wall permanently with small nails or adhesive at the 0-inch mark at floor level. This creates a makeshift wall chart you can use repeatedly. Read the height directly from the tape when the headpiece touches it, eliminating the need for marking and re-measuring.

A wall-mounted height ruler (growth chart) provides the same function as a taped tape measure but with larger, clearer markings. These cost $10 to $30 and are useful for families tracking children's growth over time.

Using Household Items as Measuring Aids

Seven household items have known dimensions you can use as measuring references:

Place items end-to-end from the floor to your pencil mark. Count the number of items, multiply by the known length, and add any partial remainder. The paper method is most practical: 6 sheets of US letter paper stacked end-to-end cover 66 inches (167.6 cm).

Measuring Height in Feet and Inches

Read the inches marking on your tape measure at the pencil mark, then divide by 12 to get feet and remaining inches. Example: the tape reads 67 inches. 67 / 12 = 5 with a remainder of 7. Your height is 5 feet 7 inches (5 ft 7 in or 5'7").

Some tape measures mark feet directly (a red marking or longer tick at every 12-inch interval). Count the foot marks from the floor, then count the additional inches past the last foot mark.

Round to the nearest quarter inch for practical purposes. A reading between the 7-inch and 7.25-inch marks is "5 feet 7 inches." A reading between the 7.25-inch and 7.75-inch marks is "5 feet 7 and a half inches" or just "5 ft 7.5 in" on medical forms that accept half-inch precision.

Measuring Height in Centimeters

Read the centimeter marking on your tape measure at the pencil mark. Most tape measures show centimeters on the bottom edge or on the back. Example: the tape reads 170 cm. Record as 170 cm. Round to the nearest 0.5 cm for clinical-grade precision, or to the nearest whole cm for forms and general use.

One centimeter equals 10 millimeters. The small marks between cm numbers on your tape represent millimeters. Reading at the 5th small mark past 170 means 170.5 cm. For home use, rounding to the nearest whole centimeter is sufficient.

Converting Between Height Units

Four conversion formulas cover all common height unit changes:

Use 2.54 as the conversion factor between inches and centimeters. Using 2.5 (a common shortcut) introduces a cumulative error of 1.07 inches at 170 cm. Use our Inches to CM Calculator for instant conversions.

Measuring Toddlers and Young Children (Under Age 2)

Measure infants and toddlers under 2 lying flat on a firm surface. Clinics use an infantometer (a measuring board with a fixed headboard and sliding footboard). At home, create a similar setup:

Lay the child flat on their back on a firm, flat surface (a table or the floor). Place a fixed object against the top of the head (a hardcover book or box against a wall). Gently extend both legs straight and press a flat object against the bottom of both feet (soles fully flat against it). Measure the distance between the head object and the foot object.

Measuring School-Age Children (Age 2 and Older)

Use the same wall method as adults, with 3 adjustments for children.

1. Check for tiptoe standing. Children instinctively rise on their toes when they know you are measuring. Watch their feet throughout the process. Tell them to keep their "pancake feet" flat on the floor.

2. Remove hair accessories. Ponytails, clips, bows, braids piled on top of the head, and headbands add height. Remove everything above the ears before measuring.

3. Measure at consistent intervals. The CDC recommends measuring children every 3 to 6 months. Record measurements on a growth chart (CDC growth charts for US children, WHO growth charts for international comparison). A child who drops more than 2 percentile lines between measurements should see a pediatrician.

Wearing Shoes

Shoes add 1 to 4 cm (0.4 to 1.6 inches) of artificial height. Different shoe types add different amounts: dress shoes add 2 to 3 cm (0.8 to 1.2 inches), running shoes add 2 to 3.5 cm (0.8 to 1.4 inches), boots add 3 to 5 cm (1.2 to 2 inches), flip-flops add 1 to 1.5 cm (0.4 to 0.6 inches).

Remove all footwear, including thick socks. Thin dress socks (under 2 mm thick) have negligible effect. Athletic socks with cushioned soles add 3 to 5 mm. Measure in bare feet on hard floor for the most accurate reading.

Measuring on Uneven Floors

Carpet, rugs, and uneven tile steal 0.5 to 1.5 cm (0.2 to 0.6 inches) from your measurement. Carpet fibers compress unevenly under the weight of your heels versus your toes. Thick pile carpet compresses 1 to 1.5 cm. Low-pile carpet compresses 0.5 cm. A rug over carpet adds compression from both layers.

Check floor levelness by placing a carpenter's level or a round pencil on the floor. The pencil should not roll in any direction. Old houses often have floors that slope 1 to 3 degrees, which changes the wall-to-floor angle and skews the measurement. Find the flattest area of hard floor in your home.

Incorrect Head Position

Tilting the head up raises the crown and adds up to 1.5 cm (0.6 inches). Tilting down subtracts up to 1 cm (0.4 inches). People naturally look up when they know they are being measured (subconscious desire to appear taller). The correct position is chin parallel to the floor, eyes looking straight ahead.

Use a mirror placed at eye level on the opposite wall to verify your head position. Your eyes should look directly into the mirror without tilting up or down. This self-check is the easiest way to maintain the Frankfurt Plane when measuring alone.

Reading the Measurement Wrong

Parallax error occurs when you read the tape measure from above or below the mark. Looking up at the mark from floor level makes the reading appear higher. Looking down from a standing position makes it appear lower. Read the tape at the same height as the pencil mark for an accurate number.

Other reading errors: confusing the 16ths-of-an-inch marks on imperial tapes, misidentifying which side of the tape shows inches versus centimeters, and adding the hook tab thickness (the metal end piece typically measures 1/16 inch and compensates for its own width when hooked over an edge).

Why Height Changes Throughout the Day

Spinal discs lose water and compress under gravitational force while you stand and sit upright. Each of the 23 discs compresses approximately 0.04 to 0.09 mm per hour of upright activity. Over 16 hours of being awake, total compression reaches 15 to 20 mm (1.5 to 2 cm or 0.6 to 0.8 inches).

During sleep, the discs rehydrate. Without gravitational compression, osmotic pressure draws water back into the disc nuclei. After 7 to 8 hours of horizontal rest, discs return to their maximum height. This is why you are tallest immediately after waking.

Age affects the magnitude of this change. People under 30 with well-hydrated discs lose more height during the day (up to 2 cm or 0.8 inches). People over 60 with drier, thinner discs lose less (0.5 to 1 cm or 0.2 to 0.4 inches) because their discs have less fluid to lose.

When to Get the Most Consistent Reading

Measure height in the morning, 30 to 60 minutes after waking, for the most consistent reading over time. The first 30 minutes allow initial rapid compression (about 40% of total daily loss occurs in the first hour upright). After 30 minutes, the rate of compression slows and stabilizes.

Medical clinics typically measure patients during morning hours (8 AM to 11 AM) for this reason. Research studies standardize measurement time to reduce variability between subjects.

For tracking height change over months or years, pick one time of day and use it every session. Morning measurements will consistently read 1 to 2 cm higher than evening measurements. Either is valid for tracking, as long as you compare morning-to-morning or evening-to-evening.

Home Measurement vs Doctor's Office

Three differences between home and clinical measurements explain why readings may vary:

Clinics also measure at varying times of day. An afternoon doctor's appointment produces a reading 1 to 2 cm lower than a morning home measurement. This difference is not measurement error; it is real biological variation from spinal disc compression.

How to Improve Accuracy

Six practices bring home measurement accuracy within 0.3 cm (0.1 inches) of clinical readings:

Common Heights in Feet and Inches

Common Heights in Centimeters

To measure your height at home accurately, you need a flat wall, a hard floor, a metal tape measure, and a rigid flat object for your headpiece. Stand barefoot with your heels, back, and head against the wall. Position your chin parallel to the floor (the Frankfurt Plane). Place the headpiece level on your crown, mark the wall, and measure from the floor to the mark. Take 3 measurements and average them.

The 4 most common mistakes that reduce accuracy are wearing shoes (adds 1 to 4 cm), standing on carpet (absorbs 0.5 to 1.5 cm), tilting the head (shifts reading by up to 1.5 cm), and using a soft headpiece (compresses and under-reads). Eliminate these 4 errors and your home height measurement will match a clinical stadiometer within 0.5 cm (0.2 inches).

Convert your measurement between units using our Inches to CM Calculator, Feet to Inches Calculator, or Inches to Meters Calculator. Browse the Measuring Height Guides hub for related topics including how doctors measure height, common measurement mistakes, and best time of day to measure.