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
Is 15 Stone Obese in the UK?
At 15 stone (95 kg), whether you're classified as obese depends on your height and other health factors. According to NHS guidelines, 15 stone typically falls into the obese or overweight category for most adults, though your individual BMI matters. Understanding your weight category is the first step toward better health. Use our free BMI calculator above to find your exact BMI and see where you fall on the NHS weight classification scale. This guide explains what the categories mean, the health risks linked to excess weight, and what support is available through the NHS.
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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.
Health Risks Linked to Excess Weight
Carrying excess weight increases the risk of several serious health conditions. Excess weight can affect your heart, joints, blood sugar control, and breathing, even if you feel well today. The good news is that even modest weight loss—just 5 to 10 per cent of your body weight—can significantly improve your health.
- Type 2 diabetes: Adults with obesity are up to 80 times more likely to develop type 2 diabetes than those at a healthy weight.
- Heart disease and high blood pressure: Excess weight increases strain on the heart and blood vessels, raising cardiovascular risk.
- Sleep apnoea: Obesity is strongly linked to obstructive sleep apnoea, a breathing disorder that disrupts sleep quality.
- Certain cancers: The NHS confirms that excess weight is linked to at least 13 different cancer types, including breast, bowel, and endometrial cancer.
- Joint problems: Extra weight places additional stress on knees, hips, and ankles, increasing arthritis risk.
- Fatty liver disease: Non-alcoholic fatty liver disease is increasingly common in overweight adults.
These risks don't mean you will develop these conditions, but they do show why managing weight is important for long-term health.
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.
Support and Next Steps Available to You
If you're concerned about your weight, your GP is the best starting point. They can assess your individual health, discuss what a healthy weight means for you, and explain what support is available. The NHS offers several pathways for weight management, from free digital tools and behaviour change programmes to specialist weight management services and, for eligible adults, prescription weight loss options.
At home, you can start with small, sustainable changes: aim for a calorie deficit of around 500 kcal per day for steady, healthy weight loss of roughly 0.5 kg per week. Our free progress tracker can help you log changes over time. Speak to your GP if you'd like guidance on diet, exercise, or whether prescription weight loss treatment might be suitable for you based on your health profile.
- 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 BMI is 15 stone?
At 15 stone (95 kg), your BMI depends on your height. For someone 5ft 8in (173 cm) tall, 15 stone gives a BMI of approximately 31.4, which falls into the obese category. Use our free BMI calculator above to enter your exact height and find your personal BMI.
Is 15 stone considered obese by NHS standards?
According to NHS guidelines, a BMI of 30 or above is classified as obese. Since 15 stone typically produces a BMI in the obese range for most adult heights, it often falls into this category. However, BMI is just one indicator—your GP can give you personalised health advice.
What's the healthy weight range for my height?
A healthy BMI is between 18.5 and 24.9 according to NHS guidelines. For South Asian, Chinese, Black African, or Black Caribbean adults, the NHS recommends a healthy range of 18.5 to 22.9. Your healthy weight range depends on your height; use the weight converter and BMI calculator on this page to find your target range.
How much weight do I need to lose to reach a healthy BMI?
The amount varies by height and current BMI. Generally, moving from obese to overweight, or overweight to healthy weight, involves losing 10 to 25 per cent of your body weight. Your GP can help you set realistic, personalised goals. Aim for gradual loss of 0.5 to 1 kg per week for sustainable results.
What support does the NHS offer for weight management?
The NHS offers digital weight loss tools, community weight management programmes, and specialist services through your GP referral. For eligible adults, prescription weight loss medications may be available through specialist tier 3 services. Ask your GP about what's available in your area and whether you might be eligible for additional support.
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.