Body Composition

Waist-to-Hip Ratio Calculator

Calculate your waist-to-hip ratio and assess body composition using WHO guidelines.

Waist-to-Hip Ratio

0.8

Risk Threshold Position

The ratio is shown against the common WHO waist-to-hip risk thresholds.

Male waist-to-hip ratio

Low risk (WHO guidelines)

0.8

0.61.2

Low risk (WHO guidelines)

Low: < 0.90
Moderate: 0.90–0.99
High: ≥ 1.00

WHO waist-to-hip ratio guidelines. This is one of several body composition metrics.

How to use it

Measure waist at the narrowest point (typically 0.5–1 inch above the navel), not the widest. Measure hips at the widest point of the buttocks. Stand relaxed — do not hold breath or tense abdomen.
WHR below 0.80 (women) and 0.90 (men) = low cardiovascular risk. WHR above 0.85 (women) and 0.95 (men) = high risk — this threshold is independent of BMI and body weight.
WHR is a stronger cardiovascular risk predictor than BMI because it specifically captures central/abdominal fat distribution — the metabolically active, inflammation-promoting fat depot surrounding organs.
Abdominal fat responds preferentially early in a calorie deficit. WHR often improves noticeably before overall scale weight moves significantly — track it monthly during a cut.
If your WHR falls in high-risk territory, the primary intervention is a sustained calorie deficit (300–500 below TDEE). Spot reduction does not exist — abdominal fat decreases as part of overall fat loss.

AI Integrations

Contract, discovery endpoints, and developer notes for agent use.

Always available for agents

Tool contract JSON

https://aifithub.io/contracts/waist-to-hip-ratio-calculator.json

Stable input and output contract for this exact tool.

Human review

People can use the browser page to sense-check outputs and charts, but agents should still execute against the contract and discovery endpoints.

/agent-tools.json - machine-readable tool index.
/llms.txt - human-readable model discovery guide.
/.well-known/webmcp.json - WebMCP capabilities manifest.
/.well-known/ai-plugin.json - plugin-style discovery manifest.

{
  "tool": "waist_hip_ratio",
  "waist_cm": 85,
  "hip_cm": 100,
  "gender": "male"
}

Open tool contract JSON Open AI integrations guide

Expand developer notes

Agent playbook

Resolve Waist-to-Hip Ratio Calculator from /agent-tools.json and open its contract before execution.
Validate inputs against the contract schema instead of scraping labels from the page UI.
Open the browser page only when a person wants to review charts, assumptions, or related tools.

Agent FAQ

Should ChatGPT, Claude, or another agent click through the UI?

No. Start with /agent-tools.json, then follow the tool's contract URL. The page UI is for human review, not parameter discovery.

When do tools show Quick and Advanced?

Every tool opens in Quick Start first. Advanced Controls keeps the same scenario, reveals more assumptions or diagnostics, and every tool keeps AI integrations inline below the instructions.

When should an agent still open the browser page?

Open it when a human wants to sense-check the output, review the chart, or keep exploring related tools after the calculation finishes.

Questions people usually ask

Where should I measure waist circumference?

Measure horizontally at the narrowest point of your torso, typically around the navel level. Stand relaxed and breathe normally.

Where should I measure hip circumference?

Measure at the widest point around your buttocks, keeping the tape horizontal and snug but not tight.

What does waist-to-hip ratio indicate?

WHR is a body composition metric that can correlate with health risk. Lower ratios generally suggest a healthier fat distribution pattern.

Why are the risk ranges different for males and females?

Biological differences in typical fat distribution patterns mean different WHR thresholds for males and females according to WHO guidelines.

Is this the only body composition metric I should use?

No. WHR is most useful alongside other metrics like BMI, body fat percentage, and waist circumference alone.

Is this tool free and private to use?

Yes. AI Fit Hub tools are free, no-signup browser tools. Inputs stay in your browser unless you choose to share a URL.

Do these tools replace medical guidance?

No. These outputs are general fitness estimates — not medical advice.

Can I switch between metric and imperial units?

Yes. Every tool supports both systems and remembers your preference in localStorage.

Related Resources

Learn the decision before you act

Every link here is tied directly to Waist-to-Hip Ratio Calculator. Use the explanation, formula, examples, and benchmarks to pressure-test the calculator output from first principles.

Browse all 4 resources

Guides · 1 Comparisons · 1 Formulas · 1 How To Use · 1

How To Use

5 STEPS

How to Use Waist-to-Hip Ratio Calculator

reveal insights into your health risk using the Waist-to-Hip Ratio Calculator. Learn how to accurately measure, interpret results, and understand your body fat distribution for better health management.

Read

Guide

6 MIN READ

How to Track Body Fat Accurately

Master precise body fat tracking with expert techniques and reliable methods. Learn to standardize measurements, interpret data, and utilize advanced tools for genuine progress. Achieve your body composition goals effectively.

Read

Comparison

7 CRITERIA

Navy Tape Method vs Calipers for Body Fat: Which Is Better?

Compare the Navy circumference method against skinfold calipers for body fat measurement. Accuracy, ease of use, cost, and which works better for tracking progress.

Read

Formula

3 VARIABLES

Waist To Hip Ratio Formula

Assess body fat distribution and health risk with the Waist To Hip Ratio formula. Learn accurate measurement, step-by-step calculation, and result interpretation from AI Fit Hub.

Read