Taking your own body measurements requires a flexible tape measure, minimal clothing, and a consistent technique you can repeat over time. Whether you’re sizing yourself for clothing, tracking fitness progress, or checking health-related ratios, the same core measurements apply. Here’s how to take each one accurately.
What You Need Before You Start
A standard soft fabric or plastic tape measure (the kind used in sewing) is the most practical tool for body measurements. It conforms to curves easily and is simple to read. Retractable body tapes that hook into a loop can help with spots that are hard to reach alone, like your shoulders or upper arms, but they aren’t necessary. Digital measuring tapes offer finer precision, which matters more for fitness tracking (where a quarter-inch change on your arms represents real progress) than for clothing sizing.
Measure over underwear or thin, form-fitting clothing. Bulky layers add inches and make it harder to place the tape consistently. Stand in front of a full-length mirror so you can check that the tape is level all the way around your body, not dipping or riding up in the back. If you can, have someone else help. A second pair of hands makes every measurement more reliable.
Bust, Underbust, and Bra Sizing
For your bust measurement, wrap the tape around the fullest part of your chest, typically across the nipple line. Keep your arms relaxed at your sides. The tape should sit flat against your skin without compressing the tissue. Make sure it’s level across your back by checking in the mirror.
Your underbust (also called the band measurement) goes directly beneath your breasts, right where a bra band would sit. This measurement, paired with the bust, is what determines bra size. The difference in inches between the two corresponds to cup size: a one-inch difference is an A cup, two inches is a B, three is a C, and so on.
How to Measure Your Waist
Your natural waist is the narrowest point of your torso, usually an inch or two above your belly button. To find it, place your hands on your hips and bend gently to one side. The crease that forms is your natural waistline. Wrap the tape around this spot, keeping it parallel to the floor.
Stand up straight with your shoulders back. Inhale, then exhale fully and let your abdomen relax completely. Take the reading at the end of that natural exhale. Don’t suck in your stomach. The tape should sit snugly against your skin but shouldn’t dig in or leave an indent. This breathing technique matters because holding your breath or tensing your core can shave off an inch or more, giving you an inaccurate number you can’t replicate next time.
Hip Measurement
Stand with your legs together and wrap the tape around the widest point of your hips and buttocks. This is usually six to eight inches below your natural waist, roughly at the level of your hip bones’ widest point. Again, check in the mirror that the tape is level in the back. Breathe out naturally before recording the number.
Other Common Measurements
Neck
Wrap the tape around the base of your neck, where a crew-neck collar would sit. You should be able to slide two fingers between the tape and your skin. This keeps the measurement from being too tight, which is especially important if you’re sizing for collared shirts or necklines.
Shoulder Width
Measure from the bony point at the top of one shoulder straight across your back to the same point on the other side. This is nearly impossible to do accurately alone, so ask for help or use a retractable tape that can hook at one end.
Arm Length
Bend your elbow slightly. Measure from the top of your shoulder, over the point of your elbow, and down to your wrist bone. Keeping a slight bend prevents the measurement from coming up short when your arm is naturally at rest.
Upper Arm
Wrap the tape around the thickest part of your upper arm, midway between your shoulder and elbow. Let your arm hang relaxed rather than flexing.
Thigh
Stand with your weight evenly on both feet. Measure around the fullest part of your upper thigh, just below where your leg meets your body.
Inseam
The inseam runs from your crotch down to where you want your pants to end. The easiest method is to grab a pair of pants that fit the way you like, lay them flat on the floor, and measure from the crotch seam straight down to the hem. Measure a few different styles if you have them, because the ideal inseam length shifts between skinny, straight, and wide-leg cuts. Measuring while wearing the shoes you’d pair with the pants gives the most practical result.
Getting Consistent Results Every Time
The single biggest source of error isn’t the tape itself. It’s inconsistency between sessions. Small changes in posture, breathing, or tape placement can shift a measurement by half an inch or more, which is enough to mask real changes in your body or land you in the wrong clothing size. A few habits help:
- Same time of day. Your body retains more water as the day goes on. Morning measurements (before eating) tend to be slightly smaller and more stable.
- Same clothing. Always measure in the same underwear or the same thin layer.
- Same posture and breathing. Stand straight, shoulders back, exhale naturally, relax your stomach. Every time.
- Same landmarks. Use your belly button, hip bones, or specific moles as reference points so you’re placing the tape in the same spot each session.
- Write everything down immediately. Record the number before you move the tape. If you’re tracking over time, note the date and keep a simple spreadsheet or journal so you can spot trends rather than fixating on any single reading.
If a measurement looks unexpectedly different from last time, take it again. Three readings within a quarter inch of each other is a good sign you’ve got it right. Average those three if you want the most reliable number.
What Your Measurements Tell You About Health
Two ratios derived from basic measurements are widely used as health indicators for women. Your waist-to-hip ratio (WHR) is your waist measurement divided by your hip measurement. A WHR below 0.85 is considered normal for women; above that is associated with higher cardiovascular and metabolic risk because it reflects more fat stored around the organs rather than the hips and thighs.
Your waist-to-height ratio (WHtR) is your waist measurement divided by your height (both in the same units). A WHtR below 0.5 is considered favorable for both men and women. It’s a quick check: if your waist circumference is less than half your height, your body fat distribution is in a lower-risk range. Both ratios are more informative than weight alone because they capture where fat sits on your body, which matters more for long-term health than total pounds on a scale.