BMI of 13 — What Does It Mean?

"BMI Meaning" Calculator
What does BMI of
mean

BMI of 13 — is it good or bad?

Answer

BMI 13 for Males and Females means
Underweight/Severe 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
← 13
1445
↑ BMI
UnderOver

5.5 below the healthy range (18.5 ≤ BMI < 25)

WHO BMI categories (adults)

BMIWeight Category
BMI < 16Underweight/Severe thinness
16 ≤ BMI < 17Underweight/Moderate thinness
17 ≤ BMI < 18.5Underweight/Mild thinness
18.5 ≤ BMI < 25Normal/Healthy Weight
25 ≤ BMI < 30Overweight/Pre-obese
30 ≤ BMI < 35Obese/Class I
35 ≤ BMI < 40Obese/Class II
BMI ≥ 40Morbid Obesity/Class III

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 13 at common heights

cm · kgft/in · lbs
150 cm · 29.3 kg
≈ 29 kg · BMI 12.89		4'11" · 64.4 lbs
155 cm · 31.2 kg5'1" · 68.8 lbs
160 cm · 33.3 kg
≈ 33 kg · BMI 12.89		5'3" · 73.4 lbs
165 cm · 35.4 kg
≈ 35 kg · BMI 12.86		5'5" · 78.1 lbs
170 cm · 37.6 kg
≈ 38 kg · BMI 13.15		5'7" · 83 lbs
175 cm · 39.8 kg
≈ 40 kg · BMI 13.06		5'9" · 88 lbs
180 cm · 42.1 kg5'11" · 93.2 lbs
185 cm · 44.5 kg6'1" · 98.5 lbs
190 cm · 46.9 kg
≈ 47 kg · BMI 13.02		6'3" · 104 lbs

ft/in — nearest inch to the height in cm; the weight is computed for that inch.

See Also

Recalculate with different values ↑

BMI Table

BMICategory
10.5Underweight/Severe thinness
11Underweight/Severe thinness
11.2Underweight/Severe thinness
11.4Underweight/Severe thinness
11.5Underweight/Severe thinness
11.7Underweight/Severe thinness
11.8Underweight/Severe thinness
11.9Underweight/Severe thinness
12Underweight/Severe thinness
12.4Underweight/Severe thinness
12.5Underweight/Severe thinness
12.6Underweight/Severe thinness
12.7Underweight/Severe thinness
12.8Underweight/Severe thinness
12.9Underweight/Severe thinness
13Underweight/Severe thinness
13.1Underweight/Severe thinness
13.2Underweight/Severe thinness
13.3Underweight/Severe thinness
13.4Underweight/Severe thinness
13.5Underweight/Severe thinness
13.6Underweight/Severe thinness
13.7Underweight/Severe thinness
13.8Underweight/Severe thinness
13.9Underweight/Severe thinness
14Underweight/Severe thinness
14.1Underweight/Severe thinness
14.2Underweight/Severe thinness
14.3Underweight/Severe thinness
14.4Underweight/Severe thinness

FAQ

BMI of 13 — is it good or bad?

BMI 13 for Males and Females means Underweight/Severe thinness

Is BMI of 13 dangerous?

BMI of 13 falls into the "Underweight/Severe 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 13?

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 13 means about 82.9 lb (37.6 kg). A taller person reaches the same BMI at a proportionally higher weight.

Does a BMI of 13 mean the same for men and women?

Yes — the WHO adult scale has no separate cut-offs by sex, so a BMI of 13 reads as "Underweight/Severe 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