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
Free tracker included with every download this week
15.5 Stone to Pounds — Is This a Healthy Weight?
15.5 stone is equivalent to 217 pounds (98.4 kg). Whether this weight is healthy depends entirely on your height, age, and overall health. The NHS uses BMI (body mass index) to assess whether a weight falls within a healthy range for a given height. Use our free BMI calculator above to check your personal BMI instantly — it takes just 10 seconds and gives you a clear picture of where you stand against NHS guidelines.
10,000+ calculations today · NHS-aligned thresholds · 100% free
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.
Healthy Weight Ranges by Height
At 15.5 stone (217 lbs), your weight status depends on your height. Here's how this converts across common UK heights:
- At 5ft 6in (168 cm): BMI = 35.0 (obese) — above healthy range
- At 5ft 10in (178 cm): BMI = 31.1 (obese) — above healthy range
- At 6ft 1in (185 cm): BMI = 28.7 (overweight) — above healthy range
According to NHS guidance, a healthy BMI is between 18.5 and 24.9. To find your healthy weight range for your exact height, use the free weight converter above to see metric to imperial weight conversions, then calculate your personal BMI. If you're outside the healthy range, your GP can discuss safe, sustainable options including lifestyle changes or, where appropriate, prescription weight loss support.
Clinically BackedWeight Loss
No appointments. No waiting rooms. Just care — from a UK-regulated online pharmacy.
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.
NHS Guidance and Next Steps
The NHS recommends checking your waist measurement alongside your weight. Men should aim for a waist under 94 cm (37 in), and women under 80 cm (31.5 in) — measurements above these indicate increased health risk even at a lower BMI. If you're at 15.5 stone and outside the healthy weight range, don't worry. The NHS offers free support through your GP, including tier 1 weight management services, lifestyle advice, and access to specialist services where needed. Start by speaking to your GP, who can assess your individual health, discuss your goals, and recommend the right approach for you. Small, consistent changes often lead to the best long-term results.
- 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.
How do I convert 15.5 stone to kilograms?
15.5 stone × 6.35029 = 98.4 kg. You can use the weight converter on this page to instantly switch between stone, kilograms, and pounds. This makes it easy to compare your weight against NHS guidelines, which often reference kg.
What's the difference between stone and pounds?
One stone equals exactly 14 pounds. So 15.5 stone = (15.5 × 14) = 217 pounds. Both are imperial units used in the UK; stone is more common for body weight, whilst pounds are used in smaller increments or medical records.
Is 15.5 stone healthy?
It depends on your height. At 5ft 6in, 15.5 stone is obese (BMI 35); at 6ft 1in, it's overweight (BMI 28.7). Use our free BMI calculator above to find out your personal BMI and see where you fall on the NHS healthy weight scale.
What should I do if I'm above the healthy weight range?
Start by speaking to your GP. They can assess your health, discuss your goals, and recommend options like lifestyle changes, structured weight management programmes, or specialist services. The NHS provides free support at every stage.
How can I find my healthy weight range?
Your healthy weight range depends on your height. For example, at 5ft 10in, a healthy weight is roughly 8st 6lbs to 11st 5lbs (54–72 kg). Use our BMI calculator and weight converter above to find your exact healthy range based on your height.
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.