How this waist-to-height ratio calculator works
The calculator divides waist circumference by height using the same unit system. It also shows waist as a percent of height and how the waist measurement compares with half the entered height.
Adult reference bands and assumptions
The optional reference context uses NICE adult waist-to-height ratio bands. Those bands are shown as source context only; this calculator does not check BMI, diagnose central adiposity or assess overall health risk.
What this tool does not include
This tool is not designed for children or teens, pregnancy, eating disorder contexts, treatment, dieting, weight-loss decisions or medical diagnosis. Measurement technique and individual context can change interpretation.
Key terms and assumptionsFormula notes, key terms, source assumptions and limits used in this calculator.
- Ratio formula
- Waist-to-height ratio equals waist circumference divided by height using the same unit.
- Adult reference context
- Optional reference bands use NICE adult waist-to-height guidance as context only. BMI is not checked in this calculator.
- Measurement scope
- This calculator supports adult measurement ranges and accepts decimals within those ranges.
- No diagnosis
- This tool does not diagnose central adiposity or health risk and should not be used for treatment, dieting or weight-loss decisions.
Related calculators
Browse the Health & Fitness calculators hub for related calculators.
- Body Fat Calculator Estimate adult body fat percentage from height, neck, waist and hip measurements using a specified circumference formula.
- BMI Calculator Estimate adult body mass index from height and weight with metric or US units and cautious category context.
- BMR Calculator Estimate adult basal metabolic rate from age, equation constant, height and weight using the Mifflin-St Jeor equation.
- Calorie Calculator Estimate adult daily maintenance calories from BMR and an activity factor, with an optional user-entered adjustment.
- Macro Calculator Convert a calorie target and macro split into estimated grams of carbohydrate, protein and fat.
- Percentage Calculator Calculate what X percent of Y is, what percent one number is of another, or the whole amount from a percentage.
- Unit Converter Convert common length, weight, temperature, area, volume, speed and time units with a focused measurement converter.
FAQs
How do I calculate waist-to-height ratio?
Divide waist circumference by height using the same units.
Do I need to use inches or centimeters?
Either works as long as waist and height use the same unit system.
Is waist-to-height ratio a diagnosis?
No. It is a screening-style estimate and not a diagnosis.
What does a ratio of 0.5 mean?
It means the entered waist measurement is half of the entered height.
Where do the reference bands come from?
This calculator uses NICE adult waist-to-height ratio guidance as source context and explains its scope.
Can children or teenagers use this calculator?
No. This calculator is scoped to adults.
Is this suitable during pregnancy?
No. This calculator is not designed for pregnancy.
Can I copy the result?
Yes. The copy summary includes the measurements, ratio and limitation note.