What is the NHS BMI range?

The NHS uses standard BMI ranges: underweight (<18.5), normal weight (18.5-24.9), overweight (25-29.9), and obese (≥30). These ranges are the same as the World Health Organization (WHO) guidelines and are used consistently across the UK healthcare system.

How does the NHS use BMI?

The NHS uses BMI as a screening tool to assess weight-related health risks. It helps healthcare professionals identify individuals who may benefit from weight management advice, lifestyle interventions, or further health assessments. BMI is often used alongside other measurements like waist circumference for a more complete health picture.

What is the average BMI in the UK?

According to NHS statistics, the average BMI in the UK is around 27-28, which falls in the overweight category. However, this varies by age, gender, and region. The NHS encourages maintaining a BMI within the healthy range (18.5-24.9) to reduce the risk of health conditions such as heart disease, diabetes, and certain cancers.

How accurate is BMI according to the NHS?

The NHS recognizes BMI as a useful screening tool but notes it has limitations. BMI does not distinguish between muscle and fat mass, so it may not be accurate for very muscular individuals, athletes, pregnant women, or older adults with reduced muscle mass. For a more comprehensive health assessment, the NHS recommends consulting with healthcare professionals who can consider additional factors.

⚖️ BMI Calculator UK (NHS)

UK & NHS-based BMI calculator. Uses official NHS BMI ranges with clear classification, chart, formula, and healthy weight guidance.

NHS BMI Guidelines

This calculator uses NHS-approved BMI ranges and classifications.

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BMI Standard

Frequently Asked Questions

Common questions about BMI in the UK

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Last updated: 2025-10-21 — Compiled and reviewed by Calvin (Health Research, FreeCalculators.app)