Height-to-Weight Ratio Tables 2025: WHO BMI Grid vs NHANES Population Reference
Core Conclusion
Height-to-weight ratio tables are two-dimensional grids where rows represent heights, columns represent weights, and cells carry a computed BMI category label. The WHO global standard classifies each cell as underweight (below 18.5 BMI), normal (18.5–24.9), overweight (25.0–29.9), obese class I (30.0–34.9), obese class II (35.0–39.9), or obese class III (40.0+). NHANES 2017-2020 population tables report actual observed mean weight values at each height bin from a US national cross-sectional sample. Metric and imperial reference tables present identical information in different unit systems. These tables are population screening references, not individual diagnostic determinations.
Height-to-weight ratio tables are among the oldest and most widely reproduced statistical reference formats in public health literature. A table with heights on one axis and weights on the other appears in every textbook of introductory epidemiology, every public health agency website, and every clinical intake reference binder. Yet the conceptual distinction between two fundamentally different types of height-weight tables — classification grids based on deterministic BMI formulas, and population reference tables based on observed survey sample data — is often lost on readers. This page documents both table types side by side, presents full metric and imperial lookup tables, walks through the construction logic of each, and explains the categorical interpretation of individual cells using a concrete worked use case.
Readers who wish to interactively position a specific height-weight pair against these reference grids can use the [Height-Weight Ratio Tool + ../tools/height-weight-ratio.html] which implements cell positioning and category highlighting. The [Standard Weight Chart + ../tools/standard-weight-chart.html] presents WHO BMI-derived population weight bands for each centimeter of height, and the [BMI Calculator + ../tools/bmi-calculator.html] computes the exact numerical BMI value for any given height and weight pair.
2D Height-Weight Grid Definition
A two-dimensional height-to-weight classification grid (also called a BMI grid or BMI lookup chart) is a matrix with two labeled axes. The vertical axis (rows, read top to bottom) lists discrete height values in regular increments. The horizontal axis (columns, read left to right) lists discrete weight values in regular increments. The cell at the intersection of any specific height row and weight column contains the result of applying the BMI formula to that (height, weight) coordinate pair, followed by classification against the WHO category boundaries. In color-coded versions of the table, each cell carries a background color corresponding to its category label.
The mathematical operation applied to each cell is the standard metric BMI formula: BMI = weight_kg / (height_m × height_m), where height_m is the row height expressed in meters and weight_kg is the column weight expressed in kilograms. For imperial unit tables, the formula uses the pound-inch equivalent with the 703 conversion constant: BMI = (weight_lb × 703) / (height_in × height_in). Both formulas produce the same numerical BMI value for a given physical height-weight pair when unit conversions are applied correctly.
After the BMI number is computed for a cell, that number is compared to the WHO 1995/2000 classification thresholds to assign the cell's category label. The six WHO adult BMI categories applied to cells are: underweight (BMI < 18.5), normal range (18.5 ≤ BMI ≤ 24.9), overweight (25.0 ≤ BMI ≤ 29.9), obese class I (30.0 ≤ BMI ≤ 34.9), obese class II (35.0 ≤ BMI ≤ 39.9), and obese class III (BMI ≥ 40.0). The diagonal line of cells where BMI = 18.5 forms the underweight-to-normal boundary, and the diagonal line where BMI = 25.0 forms the normal-to-overweight boundary. On a well-constructed grid, these boundary lines are visually apparent as color transitions running diagonally from upper-left toward lower-right.
Female vs Male NHANES Mean Tables (NHANES 2017-2020 Mean Weight by Height Percentile Cross-Tabulations)
NHANES (National Health and Nutrition Examination Survey) is a continuous cross-sectional survey conducted by the US National Center for Health Statistics, part of the Centers for Disease Control and Prevention. Each two-year NHANES cycle publishes anthropometry tables summarizing measured height and weight values for a nationally representative probability sample of the civilian non-institutionalized US resident population. The 2017-2020 NHANES cycle (combined pre-pandemic data) is the most recent published cycle with full adult anthropometry tables available at time of writing.
Unlike WHO BMI category grids, which are purely formula-based and invariant across populations, NHANES mean weight tables describe the actual observed central tendency of the survey sample population. NHANES tables report mean, standard error, and selected percentile values for weight within height strata, broken out separately for female and male respondents. These tables are observational statistics: they describe what a sample population actually weighed at the time of measurement, not what classification category any value belongs to.
The NHANES 2017-2020 adult (20 years and older) female and male approximate mean weight values by selected height strata are summarized below. All values are presented as approximate population reference numbers; readers requiring exact values with standard errors and confidence interval bounds should consult the direct published NHANES anthropometry report tables issued by NCHS.
| Height Stratum (cm) | Approx. Female Mean Weight (kg) NHANES 2017-2020 | Approx. Male Mean Weight (kg) NHANES 2017-2020 | Approx. Female BMI at Mean | Approx. Male BMI at Mean |
|---|---|---|---|---|
| 155 | 65 | — | 27.1 | — |
| 160 | 69 | 72 | 27.0 | 28.1 |
| 165 | 74 | 78 | 27.2 | 28.6 |
| 170 | 79 | 83 | 27.4 | 28.7 |
| 175 | 85 | 88 | 27.8 | 28.7 |
| 180 | — | 93 | — | 28.7 |
| 185 | — | 99 | — | 28.9 |
Adult Height 150cm–190cm × 40kg–110kg Full Category Table
The table below presents the complete WHO BMI category lookup grid for adult heights 150 centimeters through 190 centimeters in 5-centimeter row increments and weights 40 kilograms through 110 kilograms in 10-kilogram column increments. Each cell shows the computed BMI value (rounded to one decimal) followed by the WHO category label in brackets. Category labels: UW = Underweight (BMI < 18.5), N = Normal (18.5–24.9), OW = Overweight (25.0–29.9), OI = Obese Class I (30.0–34.9), OII = Obese Class II (35.0–39.9), OIII = Obese Class III (≥40.0).
| Height \ Weight | 40 kg | 50 kg | 60 kg | 70 kg | 80 kg | 90 kg | 100 kg | 110 kg |
|---|---|---|---|---|---|---|---|---|
| 150 cm | 17.8 [UW] | 22.2 [N] | 26.7 [OW] | 31.1 [OI] | 35.6 [OII] | 40.0 [OIII] | 44.4 [OIII] | 48.9 [OIII] |
| 155 cm | 16.6 [UW] | 20.8 [N] | 25.0 [OW] | 29.1 [OW] | 33.3 [OI] | 37.5 [OII] | 41.6 [OIII] | 45.8 [OIII] |
| 160 cm | 15.6 [UW] | 19.5 [N] | 23.4 [N] | 27.3 [OW] | 31.3 [OI] | 35.2 [OII] | 39.1 [OII] | 43.0 [OIII] |
| 165 cm | 14.7 [UW] | 18.4 [N] | 22.0 [N] | 25.7 [OW] | 29.4 [OW] | 33.1 [OI] | 36.7 [OII] | 40.4 [OIII] |
| 170 cm | 13.8 [UW] | 17.3 [UW] | 20.8 [N] | 24.2 [N] | 27.7 [OW] | 31.1 [OI] | 34.6 [OI] | 38.1 [OII] |
| 175 cm | 13.1 [UW] | 16.3 [UW] | 19.6 [N] | 22.9 [N] | 26.1 [OW] | 29.4 [OW] | 32.7 [OI] | 35.9 [OII] |
| 180 cm | 12.3 [UW] | 15.4 [UW] | 18.5 [N] | 21.6 [N] | 24.7 [N] | 27.8 [OW] | 30.9 [OI] | 34.0 [OI] |
| 185 cm | 11.7 [UW] | 14.6 [UW] | 17.5 [UW] | 20.5 [N] | 23.4 [N] | 26.3 [OW] | 29.2 [OW] | 32.1 [OI] |
| 190 cm | 11.1 [UW] | 13.9 [UW] | 16.6 [UW] | 19.4 [N] | 22.2 [N] | 24.9 [N] | 27.7 [OW] | 30.5 [OI] |
Metric System Reference Table
The table below presents the WHO BMI category boundary weight values for each 5-centimeter height increment from 150cm through 190cm. For each height, three boundary weights are shown: the upper limit of underweight (BMI = 18.5), the upper limit of normal (BMI = 25.0, equivalently the lower limit of overweight), and the upper limit of overweight (BMI = 30.0, equivalently the lower limit of obese class I). All values are in kilograms and rounded to one decimal place.
| Height (cm) | Underweight/Normal Boundary (kg at BMI 18.5) | Normal/Overweight Boundary (kg at BMI 25.0) | Overweight/Obese I Boundary (kg at BMI 30.0) |
|---|---|---|---|
| 150 | 41.6 | 56.3 | 67.5 |
| 155 | 44.5 | 60.1 | 72.1 |
| 160 | 47.4 | 64.0 | 76.8 |
| 165 | 50.4 | 68.1 | 81.7 |
| 170 | 53.5 | 72.3 | 86.7 |
| 175 | 56.7 | 76.6 | 91.9 |
| 180 | 59.9 | 81.0 | 97.2 |
| 185 | 63.3 | 85.5 | 102.7 |
| 190 | 66.8 | 90.3 | 108.3 |
Imperial System Reference Table (ft/in × lb)
The table below presents the same WHO BMI category boundary weight values expressed in the imperial system: heights in feet-and-inches from 4'11" through 6'3", and boundary weights in pounds. Imperial BMI calculations use the formula BMI = (lb × 703) / (in × in). Values are rounded to the nearest whole pound.
| Height (ft/in) | Total Inches | UW/N Boundary (lb at BMI 18.5) | N/OW Boundary (lb at BMI 25.0) | OW/OI Boundary (lb at BMI 30.0) |
|---|---|---|---|---|
| 5'0" | 60 | 95 | 128 | 153 |
| 5'2" | 62 | 101 | 136 | 164 |
| 5'4" | 64 | 108 | 145 | 174 |
| 5'6" | 66 | 115 | 155 | 185 |
| 5'8" | 68 | 122 | 164 | 197 |
| 5'10" | 70 | 129 | 174 | 209 |
| 6'0" | 72 | 136 | 184 | 221 |
| 6'2" | 74 | 144 | 195 | 234 |
What Each Color Cell Represents
Each cell in a color-coded height-to-weight ratio grid encodes a single piece of information: the WHO BMI classification category that applies to the (height, weight) coordinate pair at that cell's location. Cells are not value judgments about any individual person; they are formula-derived classification labels that apply to the coordinate pair itself. A cell colored "normal" means that the specific height and weight values labeling that cell's row and column happen to produce a BMI number between 18.5 and 24.9 when the BMI formula is applied. Nothing more is asserted, and nothing about any individual person is implied by that label in isolation.
Boundary cells — those immediately adjacent to a category transition line — are particularly important to interpret correctly. Because BMI is a continuous real-valued function of height and weight, any discrete grid with finite step sizes will place cells near boundaries. A cell whose computed BMI value is 24.9 sits in the normal category; the next heavier weight column at the same height, which may compute to 25.1, sits in the overweight category. The individual stepping from 24.9 to 25.1 has crossed a classification boundary but has not changed in any categorical way other than the label assigned by the WHO threshold convention. This threshold discontinuity is an inherent property of any categorical classification system applied to a continuous underlying variable, and it is explicitly noted in the WHO BMI classification reports themselves.
Why Height-to-Weight Tables Are Not Individual Diagnoses
Height-to-weight ratio tables, whether of the WHO classification grid type or the NHANES population reference type, are aggregate population-level references. This is stated explicitly on CDC and WHO public information pages that present such tables, and it is documented extensively in peer-reviewed literature on BMI limitations. Three classes of reason underlie the categorical distinction between population reference and individual diagnosis.
First, the BMI formula incorporated into classification grids treats all weight identically without partitioning by body composition. Two coordinate pairs at the same (height, weight) cell may represent individuals with substantially different proportions of lean body mass, adipose tissue, bone mineral content, and total body water. These composition differences are well documented in NHANES DXA (dual-energy X-ray absorptiometry) substudy publications and in body composition research literature broadly.
Second, classification grids contain no information about adipose tissue anatomical distribution. Epidemiological research consistently documents that abdominal versus peripheral adipose distribution patterns correlate with population-level health outcome patterns independently of total BMI value. Height-to-weight tables and the underlying BMI formula contain no waist circumference, waist-to-hip ratio, or waist-to-height ratio term, and therefore cannot reflect this dimension of body composition.
Third, population mean tables such as NHANES describe central tendency of a survey sample at a point in historical time. They do not establish normative thresholds or classification boundaries. A population mean sitting in a particular WHO BMI category is a descriptive observation about that sample, not a prescriptive statement. For these reasons combined, qualified clinical assessment is required for any individual determination, and the output of a height-to-weight table alone never constitutes a diagnosis.
Worked Use Case: Person 170cm, 75kg — Locate Cell and Interpret Boundary
Consider a coordinate pair of height = 170 cm and weight = 75 kg. The worked use case below demonstrates how to locate the corresponding grid cell, compute the exact BMI value, compare the value against WHO category boundaries, and interpret the result relative to the adjacent normal-overweight boundary line.
Step 1: Identify Row and Column Intersection
On the 150cm-190cm grid with 5cm row steps and 10kg column steps, 170cm matches the 170cm row exactly. The weight value 75kg sits between the 70kg column and the 80kg column, 50% of the way from 70kg to 80kg. Interpolating between the 70kg column cell (BMI 24.2, normal) and the 80kg column cell (BMI 27.7, overweight) at the 170cm row confirms that 75kg falls between these two published grid cells.
Step 2: Compute Exact BMI Value
Height in meters = 170 cm ÷ 100 = 1.70 m. Height squared = 1.70 × 1.70 = 2.89 m². BMI = 75 kg ÷ 2.89 m² = 25.95, which rounds to 26.0.
Step 3: Compare Against WHO Thresholds
The computed BMI of 26.0 falls above the normal-to-overweight threshold of 25.0 and below the overweight-to-obese threshold of 30.0. It therefore sits within the WHO overweight category range (25.0 through 29.9). Specifically, 26.0 sits 1.0 BMI unit above the lower boundary of the overweight category, placing it near the boundary between the normal and overweight categories.
Step 4: Interpret Relative to Boundary
The exact boundary weight at 170cm for BMI = 25.0 is 25.0 × 2.89 = 72.25 kg, as shown in the metric system reference table (170cm row, N/OW boundary column = 72.3 kg). A 75kg coordinate is therefore 2.75 kg above the 72.25 kg boundary weight at this height, placing it just across the boundary into the overweight cell area of the grid. This proximity to the boundary is relevant context when interpreting the classification label, as small absolute weight differences near any threshold move a coordinate pair across the classification boundary line.