BMI of 18 — What Does It Mean?
"BMI Meaning" Calculator
BMI of 18 — is it good or bad?
Answer
BMI 18 for Males and Females means
Underweight/Mild thinness
WHO adult scale (18+) · not for pregnancy · the same cut-offs for women and men · BMI does not tell muscle from fat
UnderHealthyOverObese
18.5
25
30
35
40
181445
↑ BMI
0.5 below the healthy range (18.5 ≤ BMI < 25)
WHO BMI categories (adults)
| BMI | Weight Category |
|---|---|
| BMI < 16 | Underweight/ |
| 16 ≤ BMI < 17 | Underweight/ |
| 17 ≤ BMI < 18.5 | Underweight/ |
| 18.5 ≤ BMI < 25 | Normal/ |
| 25 ≤ BMI < 30 | Overweight/ |
| 30 ≤ BMI < 35 | Obese/ |
| 35 ≤ BMI < 40 | Obese/ |
| BMI ≥ 40 | Morbid Obesity/ |
Screening, not a diagnosis. Children and teenagers 5–19 are read against WHO BMI-for-age; for many Asian populations WHO names lower action points, 23 and 27.5. Who the BMI scale applies to ↗ · sources: WHO, pregnancy — NHS
BMI 18 at common heights
| cm · kg | ft/in · lbs |
|---|---|
| 150 cm · 40.5 kg ≈ 41 kg · BMI 18.22 | 4'11" · 89.1 lbs ≈ 89 lbs · BMI 17.97 |
| 155 cm · 43.2 kg ≈ 43 kg · BMI 17.9 | 5'1" · 95.3 lbs ≈ 95 lbs · BMI 17.95 |
| 160 cm · 46.1 kg ≈ 46 kg · BMI 17.97 | 5'3" · 101.6 lbs ≈ 102 lbs · BMI 18.07 |
| 165 cm · 49 kg | 5'5" · 108.2 lbs ≈ 108 lbs · BMI 17.97 |
| 170 cm · 52 kg | 5'7" · 114.9 lbs ≈ 115 lbs · BMI 18.01 |
| 175 cm · 55.1 kg ≈ 55 kg · BMI 17.96 | 5'9" · 121.9 lbs ≈ 122 lbs · BMI 18.01 |
| 180 cm · 58.3 kg ≈ 58 kg · BMI 17.9 | 5'11" · 129.1 lbs ≈ 129 lbs · BMI 17.99 |
| 185 cm · 61.6 kg ≈ 62 kg · BMI 18.12 | 6'1" · 136.4 lbs ≈ 136 lbs · BMI 17.94 |
| 190 cm · 65 kg | 6'3" · 144 lbs |
ft/in — nearest inch to the height in cm; the weight is computed for that inch.
See Also
- BMI Calculator (Imperial) - Body Mass Index Calculator (ft/in/lbs)
- BMI Calculator (Metric) - Body Mass Index Calculator (kg/cm)
- Ideal Weight Calculator (Imperial) - Find out the Ideal Weight for a given Height in feet/inches
- Ideal Weight Calculator (Metric) - Find out the Ideal Weight for a given Height in centimeters
- One Rep Max Calculator - Estimate your 1RM from any set
BMI Table
| BMI | Category |
|---|---|
| 16.5 | Underweight/Moderate thinness |
| 16.6 | Underweight/Moderate thinness |
| 16.7 | Underweight/Moderate thinness |
| 16.8 | Underweight/Moderate thinness |
| 16.9 | Underweight/Moderate thinness |
| 17 | Underweight/Mild thinness |
| 17.1 | Underweight/Mild thinness |
| 17.2 | Underweight/Mild thinness |
| 17.3 | Underweight/Mild thinness |
| 17.4 | Underweight/Mild thinness |
| 17.5 | Underweight/Mild thinness |
| 17.6 | Underweight/Mild thinness |
| 17.7 | Underweight/Mild thinness |
| 17.8 | Underweight/Mild thinness |
| 17.9 | Underweight/Mild thinness |
| 18 | Underweight/Mild thinness |
| 18.1 | Underweight/Mild thinness |
| 18.2 | Underweight/Mild thinness |
| 18.3 | Underweight/Mild thinness |
| 18.4 | Underweight/Mild thinness |
| 18.5 | Normal/Healthy Weight |
| 18.6 | Normal/Healthy Weight |
| 18.7 | Normal/Healthy Weight |
| 18.8 | Normal/Healthy Weight |
| 18.9 | Normal/Healthy Weight |
| 19 | Normal/Healthy Weight |
| 19.1 | Normal/Healthy Weight |
| 19.2 | Normal/Healthy Weight |
| 19.3 | Normal/Healthy Weight |
| 19.4 | Normal/Healthy Weight |
FAQ
BMI of 18 — is it good or bad?
BMI 18 for Males and Females means Underweight/Mild thinness
Is BMI of 18 dangerous?
BMI of 18 falls into the "Underweight/Mild thinness" category. A BMI below 18.5 may indicate insufficient body weight. Consult a healthcare professional for personalized advice.
What weight gives a BMI of 18?
BMI is weight divided by height in metres squared, so it names a weight only once the height is fixed: at 170 cm (5 ft 7 in) a BMI of 18 means about 114.6 lb (52 kg). A taller person reaches the same BMI at a proportionally higher weight.
Does a BMI of 18 mean the same for men and women?
Yes — the WHO adult scale has no separate cut-offs by sex, so a BMI of 18 reads as "Underweight/Mild thinness" for both. Age is what changes it: the adult table starts at 18, while children and teenagers aged 5–19 are compared with age- and sex-specific reference values instead.
See Also
- What does BMI of 17 mean?
- What does BMI of 17.1 mean?
- What does BMI of 17.2 mean?
- What does BMI of 17.3 mean?
- What does BMI of 17.4 mean?
- What does BMI of 17.5 mean?
- What does BMI of 17.6 mean?
- What does BMI of 17.7 mean?
- What does BMI of 17.8 mean?
- What does BMI of 17.9 mean?
- What does BMI of 18.1 mean?
- What does BMI of 18.2 mean?
- What does BMI of 18.3 mean?
- What does BMI of 18.4 mean?
- What does BMI of 18.5 mean?
- What does BMI of 18.6 mean?
- What does BMI of 18.7 mean?
- What does BMI of 18.8 mean?
- What does BMI of 18.9 mean?
- What does BMI of 19 mean?
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