BMI of 31 — What Does It Mean?

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BMI of 31 — is it good or bad?

Answer

BMI 31 for Males and Females means
Obese/Class I

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
31
1445
↑ BMI

6 above 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 31 at common heights

cm · kgft/in · lbs
150 cm · 69.8 kg
≈ 70 kg · BMI 31.11		4'11" · 153.5 lbs
≈ 154 lbs · BMI 31.1
155 cm · 74.5 kg
≈ 74 kg · BMI 30.8		5'1" · 164.1 lbs
≈ 164 lbs · BMI 30.98
160 cm · 79.4 kg
≈ 79 kg · BMI 30.86		5'3" · 175 lbs
165 cm · 84.4 kg
≈ 84 kg · BMI 30.85		5'5" · 186.3 lbs
≈ 186 lbs · BMI 30.95
170 cm · 89.6 kg
≈ 90 kg · BMI 31.14		5'7" · 198 lbs
175 cm · 94.9 kg
≈ 95 kg · BMI 31.02		5'9" · 209.9 lbs
≈ 210 lbs · BMI 31.01
180 cm · 100.4 kg
≈ 100 kg · BMI 30.86		5'11" · 222.3 lbs
≈ 222 lbs · BMI 30.96
185 cm · 106.1 kg
≈ 106 kg · BMI 30.97		6'1" · 235 lbs
190 cm · 111.9 kg
≈ 112 kg · BMI 31.02		6'3" · 248 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
29.4Overweight/Pre-obese
29.5Overweight/Pre-obese
29.6Overweight/Pre-obese
29.7Overweight/Pre-obese
29.8Overweight/Pre-obese
29.9Overweight/Pre-obese
30Obese/Class I
30.1Obese/Class I
30.2Obese/Class I
30.3Obese/Class I
30.5Obese/Class I
30.6Obese/Class I
30.7Obese/Class I
30.8Obese/Class I
30.9Obese/Class I
31Obese/Class I
31.1Obese/Class I
31.2Obese/Class I
31.3Obese/Class I
31.4Obese/Class I
31.5Obese/Class I
31.6Obese/Class I
31.7Obese/Class I
31.8Obese/Class I
31.9Obese/Class I
32Obese/Class I
32.1Obese/Class I
32.2Obese/Class I
32.3Obese/Class I
32.4Obese/Class I

FAQ

BMI of 31 — is it good or bad?

BMI 31 for Males and Females means Obese/Class I

Is BMI of 31 dangerous?

BMI of 31 falls into the "Obese/Class I" category. A BMI of 25 or more may indicate excess body weight. Consult a healthcare professional for personalized advice.

What weight gives a BMI of 31?

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 31 means about 197.5 lb (89.6 kg). A taller person reaches the same BMI at a proportionally higher weight.

Does a BMI of 31 mean the same for men and women?

Yes — the WHO adult scale has no separate cut-offs by sex, so a BMI of 31 reads as "Obese/Class I" 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