Waist to Hip Ratio Calculator

Sex:

Choose female or male reference bands.

Waist circumference:

Hip circumference:

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Display precision: {{ decimals }}

Accepted range: 0-4 decimal places.

Waist correction:

Enter cm; use negative values for over-measurement.

Hip correction:

Enter cm; use negative values for over-measurement.

Tape uncertainty: {{ formatNumber(uncertaintyCm, 1) }} cm

Accepted range: 0-3 cm tape swing.

Abdominal screen:

Choose WHO standard or female-sensitive thresholds.

Custom banding:

Switch on to enter custom low and high cutoffs.

Custom cutoffs:

Low < High <

Metric	Value	Copy
{{ key }}	{{ value }}

Section	Signal	Interpretation
Current reading	Band	{{ classificationLabel }}
Current reading	Band source	{{ thresholdSourceLabel }}
Current reading	Abdominal screen	{{ abdominalRiskBadge }}
Current reading	Uncertainty status	{{ stabilityBadgeText }}
Guidance line	Primary guidance	{{ primaryGuidanceLine }}
Decision note	Note {{ index + 1 }}	{{ note }}

Threshold path	Target	Gap	Interpretation	Copy
{{ row.label }}	{{ row.target }}	{{ row.gap }}	{{ row.note }}

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Introduction:

Waist-to-hip ratio, often shortened to WHR, compares the circumference around the waist with the circumference around the hips. The calculation is simple, but the interpretation is not the same as looking at waist size alone. A 78 cm waist with 104 cm hips gives a different body-shape signal from a 78 cm waist with 88 cm hips.

WHR is mainly used as a screening clue for abdominal fat distribution. More circumference carried around the abdomen, relative to the hips, can point to a different pattern of cardiometabolic risk than weight carried around the hips, thighs, or limbs. That is why WHR is often discussed beside BMI and waist circumference rather than as a replacement for either measure.

WHR changes when either side of the fraction changes: waist in the numerator, hip in the denominator.

The ratio can be misunderstood because hips are part of the denominator. A person can lower WHR by reducing waist circumference, but WHR can also be lower simply because hip circumference is larger. The number is therefore a body-distribution screen, not a direct measurement of abdominal fat, fitness, strength, or health.

How waist-to-hip ratio differs from related body measures
Measure	What it emphasizes	Common blind spot
Waist-to-hip ratio	Waist circumference relative to hip circumference.	Can change because of hip size as well as waist size.
Waist circumference	Absolute abdominal size.	Does not account for hip build or body proportions.
BMI	Weight relative to height.	Does not show where weight is carried.

Screening cutoffs are commonly reported by female and male reference categories because population studies and clinical guidance have often separated body-fat distribution that way. Those categories are broad screening conventions. They do not capture pregnancy, sex development, hormone therapy, ancestry, age, disability, recent surgery, or individual clinical context.

Repeatability matters more than a single neat decimal. Posture, breathing, clothing, tape tension, and the body landmarks used for waist and hip can move a borderline reading across 0.80, 0.85, 0.90, or 1.00. When a result is near a cutoff, repeated measurements under similar conditions are more useful than treating one tape pass as exact.

How to Use This Tool:

Select the female or male reference category used for the default band cutoffs and screen thresholds.
Measure waist circumference with the tape level, then enter the value and unit.
Measure hip circumference around the widest practical hip or buttock landmark, then enter the value and unit.
Use Display precision to choose 0 to 4 visible decimals. Precision changes the display, not the underlying classification logic.
Open Advanced only when you need known tape corrections, a tape uncertainty test, an abdominal screen profile, or custom banding.
Enter Waist correction or Hip correction in centimetres only for a known offset, such as a consistent clothing or tape-reading bias. Negative corrections reduce the adjusted measurement.
Set Tape uncertainty from 0 to 3 cm when repeated readings vary and you want to test whether the band or screen could flip.
Use Custom banding only when you have a positive low cutoff and a higher high cutoff from another protocol. If the custom cutoffs are incomplete or inverted, the tool falls back to the default bands.
Review the summary first, then use Waist-Hip Ratio Table, WHR Interpretation Brief, Threshold Path, Boundary Gauge, Measurement Map, and JSON when you need more detail.

Interpreting Results:

The headline WHR is the adjusted waist circumference divided by the adjusted hip circumference. Lower values mean the waist is smaller relative to the hips. Higher values mean the waist is closer to, equal to, or larger than the hip circumference.

The band label and the abdominal screen answer different questions. The band label gives a low, moderate, or high reading under the active cutoff set. The screen checks one threshold and reports whether the current ratio is still on the reference side or has reached the elevated side. A male result of 0.94, for example, can be moderate by the default band table and elevated by the WHO-style screen at 0.90.

Default waist-to-hip ratio bands and screen thresholds
Reference category	Low band	Moderate band	High band	WHO standard screen	Female-sensitive screen
Female	< 0.80	0.80 to < 0.85	≥ 0.85	≥ 0.85	≥ 0.80
Male	< 0.90	0.90 to < 1.00	≥ 1.00	≥ 0.90	≥ 0.90

The Threshold Path translates the same ratio rules into measurement gaps. It shows the waist value tied to each cutoff at the current hip measurement, plus the hip circumference that would be needed to move below a boundary if waist stayed the same.

The uncertainty badge is especially important near a cutoff. If a plus-or-minus 0.5 cm tape swing lets the band move from moderate to high, the practical answer is not the single displayed label; it is that the measurement is too close to call without another repeatable reading.

Technical Details:

WHR is dimensionless because both circumferences are converted into the same unit before division. The value is sensitive to both sides of the fraction. A smaller adjusted waist lowers WHR, a larger adjusted hip lowers WHR, and the reverse changes raise it.

Measurement corrections are applied before the ratio is calculated. The calculated ratio is rounded to four decimal places for stored result logic, while display precision controls only how many decimals are shown to the reader. Band decisions use the active low and high cutoffs, and the abdominal screen uses its own active threshold.

Formula Core

W_{cm} = W_{entered} \times unit factor + waist correction

H_{cm} = H_{entered} \times unit factor + hip correction

WHR = \frac{W_{cm}}{H_{cm}}

The unit factor is 1 for centimetres and 2.54 for inches. Waist and hip corrections are entered in centimetres and bounded to the visible correction range. If a correction would make adjusted waist or adjusted hip zero or negative, the tool asks for a valid measurement before showing results.

Decision rules used for waist-to-hip ratio outputs
Output	Rule	Boundary behavior
Band	Compare WHR with the active low and high cutoffs.	Low is below the low cutoff, moderate starts at the low cutoff, and high starts at the high cutoff.
Abdominal screen	Compare WHR with the selected screen threshold.	Elevated starts at the threshold value.
Waist boundary	Hip circumference multiplied by a cutoff.	Shows the waist value tied to that cutoff at the current hip measurement.
Hip floor	Waist circumference divided by a cutoff.	Shows the hip value needed to move below a boundary if waist stays fixed.

Uncertainty Range

Tape uncertainty tests a best-case and worst-case ratio around the adjusted measurements. It subtracts the uncertainty from waist and adds it to hip for the lower ratio, then adds uncertainty to waist and subtracts it from hip for the higher ratio.

{WHR}_{low} = \frac{W_{cm} - u}{H_{cm} + u}

{WHR}_{high} = \frac{W_{cm} + u}{H_{cm} - u}

The stability badge is strongest when both ends of the uncertainty range stay in the same band and on the same side of the screen threshold. Built-in warnings also catch incomplete custom cutoffs, adjusted waist below 45 cm or above 180 cm, adjusted hip below 55 cm or above 220 cm, WHR above 1.10, and readings within 0.02 of a threshold.

Limitations, Privacy, and Accuracy Notes:

WHR is a screening measure. It cannot diagnose disease or replace clinical advice.
Use consistent waist and hip landmarks, a level tape, normal breathing, and similar clothing for repeat measurements.
Pregnancy, recent surgery, posture limitations, disability, hormone-related body changes, and unusual body-shape changes may need professional measurement guidance.
Very small values, zero values, inverted custom cutoffs, uncommon ratios, and readings within 0.02 of a threshold trigger validation or warning messages.
The calculation runs in the browser after the page loads; copied and downloaded results are created only when you choose those actions.

Worked Examples:

A female reference reading with an 82 cm waist and 100 cm hip gives 82 / 100 = 0.82. By the default bands, that is moderate because it is at least 0.80 but below 0.85. It stays below the WHO standard screen at 0.85, but it reaches the female-sensitive screen at 0.80.

A male reference reading with a 94 cm waist and 98 cm hip gives 94 / 98 = 0.9592. That is moderate by the default band table because it is below 1.00. It is above the 0.90 abdominal screen, and the waist would need to be about 5.8 cm lower to move below that screen at the same hip measurement.

A 0.5 cm tape uncertainty can matter near a cutoff. With an adjusted waist of 85.0 cm and adjusted hip of 100.0 cm, the main WHR is 0.8500. The lower uncertainty path is 84.5 / 100.5, or about 0.8408, while the higher path is 85.5 / 99.5, or about 0.8593. That span crosses the female 0.85 screen threshold.

Custom banding changes only the low, moderate, and high band split. If custom cutoffs are set to 0.82 and 0.88, a WHR of 0.86 becomes moderate by that custom table, while the selected abdominal screen still uses its own threshold.

FAQ:

Should I use waist-to-hip ratio instead of BMI?

Use it beside BMI, waist circumference, and health context. WHR adds body-fat distribution context, while BMI and waist circumference answer different questions.

Why can the band and abdominal screen disagree?

The band table has low, moderate, and high ranges. The abdominal screen is a single cutoff, so a moderate result can still be elevated by the screen.

What if I am close to a cutoff?

Repeat the measurements under similar conditions and use the tape uncertainty control. Borderline readings should be treated as a range, not a precise label.

Can I use custom cutoffs?

Yes. Custom banding changes the low, moderate, and high band cutoffs when the low value is positive and below the high value. The abdominal screen remains a separate setting.

Why did the tool fall back to WHO defaults?

Custom banding must have a positive low cutoff and a high cutoff greater than the low cutoff. If that pair is incomplete or inverted, the default female or male band table is used instead.

Glossary:

Waist-to-hip ratio: Waist circumference divided by hip circumference after both measurements are in the same unit.
Adjusted measurement: The entered circumference after any manual correction has been applied.
Band cutoff: A low or high boundary used to label the ratio as low, moderate, or high.
Abdominal screen: A separate single threshold used to flag whether the ratio has reached the elevated side.
Tape uncertainty: The plus-or-minus measurement swing used to test whether normal variation could change the interpretation.

References:

Waist circumference and waist-hip ratio: report of a WHO expert consultation, World Health Organization, 16 May 2011.
NHANES Anthropometry Procedures Manual, Centers for Disease Control and Prevention, January 2020.
Am I at a Healthy Weight?, National Institute of Diabetes and Digestive and Kidney Diseases, last reviewed May 2023.