What is the BMI for 105kg?

It depends entirely on height, and that is the honest answer rather than an evasion. At 105kg the BMI is 46.7 at 150cm, 34.3 at 175cm and 26.3 at two metres — a spread of 20.4 points from one unchanged weight. What can be said definitely is which heights put 105kg inside the healthy band: 205 to 238cm, or about 6ft 9in to 7ft 10in.

Which heights is 105kg a healthy weight for?

Between 205 and 238cm — a band 33cm wide — from inverting the formula at BMI 18.5 and 24.9. Shorter than 205cm and 105kg reads above the healthy range; taller than 238cm and it reads below. On the WHO supplementary cut-offs for South and East Asian populations the shortest suitable height rises to 214cm, since those thresholds move the top of the band and not the bottom.

What are the obesity classes?

The WHO divides above 30 into three: class I from 30 to 34.9, class II from 35 to 39.9, and class III at 40 and above. They exist because the single label stops being informative across so wide a span — a BMI of 31 and one of 45 describe very different situations and were being given the same word. As with every boundary in the system, they are round numbers chosen for classifying groups rather than points where anything changes.

Is BMI reliable at the higher end of the scale?

Less so than in the middle, and for a specific reason: it cannot distinguish fat from muscle or from a large frame, and the consequences of that grow with the number. It also says nothing about where weight sits, which is what the cardiometabolic risk actually tracks. Two people at the same high BMI can have quite different waist measurements and quite different blood work, and the measure sees neither.

Do heavy athletes really get classified as obese?

Routinely. A 190cm rower at 105kg has a BMI of 29.1, and a 200cm lineman or strongman at 150kg reads 37.5 — class II. Neither figure describes what those bodies are made of, because BMI has no way to ask. It is the clearest illustration that the measure was built to characterise populations and performs badly on individuals at the edges of the distribution.

BMI for 105kg

At 105kg the arithmetic still produces a healthy height band — 205 to 238cm — but that band has passed beyond human range. Almost nobody is 205cm, so unlike the lighter pages in this series there is no height at which this weight sits inside the healthy category. What can be said is what the number is at real heights:..

YOUR MEASUREMENTS

WEIGHT (kg)

HEIGHT

= 5ft 8.9in

YOUR RESULTS

BODY MASS INDEX

34.3

Obese Class I

BMI PRIME

1.37

Normal = 0.74–1.00

PONDERAL INDEX

19.6

kg/m³

HEALTHY WEIGHT RANGE

56.7 – 76.3 kg

Lose 28.7 kg to reach healthy weight

Moderately obese. Increased risk of cardiovascular disease and diabetes.

BMI GAUGE

YOUR POSITION

FULL SUMMARY

BMI34.3

CategoryObese Class I

BMI Prime1.37

Ponderal Index19.6 kg/m³

Healthy range56.7–76.3 kg

Min healthy weight56.7 kg

Max healthy weight76.3 kg

WHO BMI CATEGORIES

Severely Underweight

< 16.0

Underweight

16.0–18.4

Normal weight

18.5–24.9

Overweight

25.0–29.9

Obese Class I

30.0–34.9

Obese Class II

35.0–39.9

Obese Class III

≥ 40.0

Created with❤️byeaglecalculator.com

HOW TO USE

1
The weight is already set to 105kg, which is about 231 pounds. Enter your height and the BMI follows — until you do, the figure is undetermined.
2
Both unit systems are seeded, so switching between kilograms and pounds keeps the same weight rather than reverting to a default.
3
Read the band of heights rather than any single BMI. At 105kg the healthy band runs 205 to 238cm, and that band is what a weight actually determines.
4
A reading near a category boundary should be read as near a boundary. Most people vary by one to two kilograms across a day from food and fluid alone.

WORKED EXAMPLE

At 105kg — about 231 pounds — the BMI is undetermined until a height is supplied. At 150cm it is 46.7, at 175cm 34.3, and at 200cm 26.3: a spread of 20.4 points from one unchanged weight, which is wider than the entire healthy band. Inverting the formula gives what a weight can determine: 105kg sits inside the healthy BMI band for heights between 205cm and 238cm, a window 33cm wide, or roughly 6ft 9in to 7ft 10in. On the WHO 2004 cut-offs for South and East Asian populations the shortest suitable height rises to 214cm, because those thresholds lower the top of the BMI band while leaving 18.5 in place.

REFERENCE FORMULAS

FORMULA REFERENCE TABLE

Name	Formula	Description
BMI (Metric)	BMI = weight(kg) / height(m)²	Divide weight in kg by height in metres squared
BMI (Imperial)	BMI = 703 × weight(lbs) / height(in)²	Multiply weight in pounds by 703, divide by height in inches squared
Height in metres	h(m) = h(cm) / 100	Convert centimetres to metres before squaring
BMI Prime	BMI Prime = BMI / 25	Ratio of BMI to upper limit of normal (25). Values >1.00 indicate overweight
Ponderal Index	PI = weight(kg) / height(m)³	More accurate than BMI for very tall or short individuals. Normal: 11–15 kg/m³
Healthy weight	w = BMI × height(m)²	Rearranged BMI formula: weight(kg) for any target BMI at your height

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Last updated: August 2, 2026 · Formula verified by EagleCalculator team · Source: WHO Global Database on Body Mass Index · Eagle-eyed accuracy for every calculation.