The UK's most complete GLP-1 guide
Every Question Answered. Every Side Effect Explained.
- How GLP-1 medications work
- Mounjaro vs Wegovy compared
- Injection instructions
- Side effects & solutions
- What to eat on treatment
- FAQs answered
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BMI Chart in Stones — UK Weight Categories Explained
A BMI chart in stones helps UK adults understand whether their weight falls into a healthy range using measurements they're familiar with. The NHS provides clear BMI categories that apply to stone and pounds, though these ranges are affected by height. Using our free BMI calculator above, you can instantly find your personal BMI category. This guide explains what each range means and how to interpret your results in practical, UK-focused terms.
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Calculate Your BMI Instantly
Enter your height and weight below. Supports both imperial (stone & lbs) and metric (kg). Results include NHS category, healthy weight range, and ethnicity adjustments.
What Is BMI and Why Does It Matter?
Body Mass Index (BMI) is the most widely used screening tool for assessing whether your weight falls within a healthy range. Used by the NHS, GPs, and weight management services across the UK, BMI provides a quick snapshot of your weight relative to your height. The formula is simple: your weight in kilograms divided by your height in metres squared (kg/m²).
While BMI isn't a perfect measure — it doesn't account for muscle mass, bone density, or fat distribution — it remains the standard first step in identifying potential weight-related health risks including type 2 diabetes, cardiovascular disease, high blood pressure, and certain cancers.
The NHS also recommends adjusted thresholds for people of South Asian, Chinese, or Black African heritage — a BMI of 23 or above is classified as overweight, and 27.5 as obese. Our calculator includes this adjustment as a one-click toggle.
NHS BMI Categories and Stone Weight Ranges
The NHS BMI formula divides your weight in kilograms by your height in metres squared. For UK measurements, the standard BMI range UK categories are: Underweight (below 18.5), Healthy Weight (18.5–24.9), Overweight (25.0–29.9), Obese Class I (30.0–34.9), Obese Class II (35.0–39.9), and Severely Obese (40.0+).
To understand this in stone, a healthy BMI at 5ft 6in (168cm) means weighing between 8st 4lbs and 11st 2lbs approximately. At the same height, an overweight BMI threshold begins at 11st 3lbs. These figures vary significantly with height — taller individuals can weigh more while maintaining the same BMI, and shorter individuals should weigh less.
- 5ft 2in: Healthy range 7st 6lbs–10st 1lbs
- 5ft 6in: Healthy range 8st 4lbs–11st 2lbs
- 5ft 10in: Healthy range 9st 2lbs–12st 3lbs
- 6ft 0in: Healthy range 10st 0lbs–13st 5lbs
These ranges assume standard adult metabolism. Your GP can provide personalised guidance for your individual circumstances.
Clinically BackedWeight Loss
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How It Works
Three simple steps to understand your weight and take action.
Enter your height and weight in our free calculator. Get your BMI, NHS category, healthy weight range, and ethnicity-adjusted thresholds instantly.
If your BMI suggests you're overweight or obese, explore our GLP-1 calculators to project potential weight loss on Mounjaro or Wegovy.
Use our progress tracker to log your weight weekly, visualise your journey with charts, and stay motivated — all stored privately in your browser.
Free Weight Loss Tools & Guides
Everything you need to understand your weight, explore medication options, and track your progress — completely free.
Important BMI Limitations and When to Measure Waist Size
BMI limitations are significant — the calculation doesn't distinguish between muscle and fat. Athletes or very muscular individuals may have a high BMI but low body fat, while others may have a normal BMI despite excess fat around organs. The weight converter tool on this page helps you switch between units, but BMI should never be your only health measure.
The NHS recommends also measuring waist circumference as a complementary health indicator. Men should aim below 94cm (37in), and women below 80cm (31.5in). Combined with BMI, waist measurement gives a clearer picture of health risk. For South Asian, Chinese, Black African, and Black Caribbean adults, NHS BMI thresholds are lower due to higher disease risk at the same weight. Always consult your GP about what your BMI and measurements mean for your personal health.
- Dual GIP/GLP-1 receptor agonist
- Up to 22.5% body weight loss (SURMOUNT-1)
- Weekly injection, dose escalation over 20+ weeks
- Available via private prescription in the UK
- Doses: 2.5mg → 5mg → 7.5mg → 10mg → 12.5mg → 15mg
- GLP-1 receptor agonist
- Up to 15–17% body weight loss (STEP trials)
- Weekly injection, 5-step dose escalation
- NHS & private prescription available
- Doses: 0.25mg → 0.5mg → 1mg → 1.7mg → 2.4mg
Mounjaro vs Wegovy: Head-to-Head
A side-by-side comparison of the two most popular GLP-1 weight loss medications available in the UK.
| Feature | Mounjaro | Wegovy |
|---|---|---|
| Drug class | Dual GIP/GLP-1 agonist | GLP-1 agonist |
| Active ingredient | Tirzepatide | Semaglutide |
| Avg. weight loss | 15–22.5% | 12–17% |
| Key trial | SURMOUNT-1 (2022) | STEP 1 (2021) |
| Max dose | 15 mg weekly | 2.4 mg weekly |
| Escalation period | 20–32 weeks | 16–20 weeks |
| Administration | Weekly injection (pen) | Weekly injection (pen) |
| NHS availability | Private prescription only | NHS & private |
| Approx. private cost | £150–£250/month | £150–£300/month |
| Common side effects | Nausea, diarrhoea, constipation | Nausea, vomiting, diarrhoea |
Data sourced from SURMOUNT-1 and STEP 1 clinical trials. Costs are approximate and vary by provider. Always consult a prescriber.
Am I Eligible for Weight Loss Medication?
In the UK, eligibility for GLP-1 weight loss medications like Mounjaro and Wegovy is based on your BMI and overall health profile.
- BMI of 30 or above (obese)
- Age 18 or over
- No contraindicated conditions
- Committed to lifestyle changes
- BMI of 27 or above
- Plus type 2 diabetes
- Or high blood pressure
- Or obstructive sleep apnoea
Use our BMI calculator to check whether your BMI falls within the eligible range.
How We Built These Tools
Every calculator and guide on myweightcheck is built with accuracy and transparency in mind. Our BMI calculator uses the standard WHO formula with NHS-aligned category thresholds. Our GLP-1 projections are modelled on published clinical trial data from SURMOUNT and STEP studies.
All data stays on your device. We don't require sign-ups, and we don't store your health information on any server. Your progress tracker saves data locally in your browser using localStorage, so only you can see it.
We're based in the UK and our tools are designed specifically for UK users — supporting stone & lbs by default, referencing NHS guidelines, using NICE-approved medication data, and linking to GPhC-registered pharmacies.
Frequently Asked Questions
Common questions about BMI, weight loss medications, and our free UK tools.
What is a healthy BMI in stones for a UK adult?
A healthy BMI range is 18.5–24.9. At 5ft 6in, this equals roughly 8st 4lbs to 11st 2lbs. The exact stone weight depends on your height. Use our free BMI calculator above to find your personal healthy range in stones instantly.
How do I calculate BMI if I only know my weight in stone?
Convert stone to kilograms first (1 stone = 6.35029 kg), then use the BMI formula: weight (kg) ÷ height (m)². Our BMI calculator does this automatically — just enter your weight in stone and height, and it calculates your BMI category.
What BMI in stones counts as overweight according to the NHS?
An overweight BMI starts at 25.0. At 5ft 6in, this begins at approximately 11st 3lbs. At 5ft 10in, overweight begins around 12st 4lbs. Your exact threshold depends on your height — taller people weigh more at the same BMI.
Are BMI categories in stones the same for men and women?
Yes, BMI categories are identical for men and women — the ranges don't change by sex. However, healthy body fat percentages differ by sex. BMI also doesn't account for muscle mass, so athletes of either sex may have a high BMI with low body fat.
Do people of South Asian or Black African heritage use different BMI thresholds in stone?
Yes. The NHS recommends lower thresholds for these groups: healthy weight 18.5–22.9, overweight 23.0–27.4, obese 27.5+. This is because these populations face higher disease risk at lower BMI levels. Your GP can advise on your personal health category.
Ready to take control of your weight loss journey?
Start with a free BMI check, explore your GLP-1 options, or begin tracking your progress today. No sign-up. No cost. Just results.