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
What Does 30 Stone Mean for Your Health?
30 stone is equivalent to approximately 190.5 kilograms or 420 pounds. At this weight, most adults would fall into the severely obese category according to NHS guidelines, which carries significant health risks. However, health outcomes depend on individual factors including height, age, fitness level, and existing medical conditions. Understanding your personal BMI and discussing your health with your GP is essential for safe and effective weight management. Use our free BMI calculator above to check your individual health status and healthy weight range.
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.
Converting 30 Stone to Other Units
30 stone converts to:
- 190.5 kilograms (kg)
- 420.0 pounds (lbs)
To calculate this yourself, remember that 1 stone equals 6.35 kg exactly, and 1 stone equals 14 pounds. Using our free weight converter above, you can instantly switch between stone, kilograms, and pounds. At 30 stone, if you're an adult of average height (around 5ft 6in to 5ft 9in), your BMI would fall into the severely obese range (40.0+) according to NHS classifications. This category is associated with increased risks of type 2 diabetes, heart disease, high blood pressure, and sleep apnoea. However, BMI is a screening tool and doesn't account for muscle mass or individual health variations.
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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.
Health Context and Weight Management Options
At 30 stone, NHS guidance recommends discussing weight management with your GP as a priority for your long-term health. Your doctor can assess your individual situation and discuss options including lifestyle changes, referral to specialist weight management services (tier 3), and where appropriate, prescription weight loss medications. Even a 5–10% reduction in body weight—around 9.5–19 kg (1–3 stone)—can significantly improve blood pressure, blood sugar control, and joint health. Our free GLP-1 weight loss calculator can help you explore projected outcomes with prescription weight loss support, and our progress tracker lets you log and monitor your journey.
- 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 much is 30 stone in kilograms?
30 stone equals 190.5 kilograms (or approximately 190.5 kg). To convert, multiply stone by 6.35029. Use our weight converter tool above to instantly convert between stone, kg, and pounds for any weight.
What is the BMI of someone who weighs 30 stone?
BMI depends on height as well as weight. For an adult who is 5ft 8in tall (173 cm) and weighs 30 stone, the BMI would be approximately 48.5, which falls into the severely obese category (BMI 40+). Calculate your personal BMI using the free calculator on this page.
Is 30 stone considered obese?
Yes. According to NHS guidelines, 30 stone (190.5 kg) falls into the severely obese category for most adults. This classification indicates increased health risks and is grounds for discussing weight management support with your GP or accessing NHS specialist weight management services.
What health risks are associated with weighing 30 stone?
At 30 stone, the risks include type 2 diabetes, heart disease, high blood pressure, stroke, sleep apnoea, osteoarthritis, and certain cancers. However, individual risk depends on overall health, fitness, genetics, and medical history. Your GP can assess your personal risk profile.
Can prescription weight loss medication help someone who weighs 30 stone?
Prescription weight loss medications such as GLP-1 injections (Wegovy or Mounjaro) may be considered as part of a comprehensive weight management plan. These are prescription-only and require assessment by a healthcare professional. They work alongside diet and exercise changes, not as replacements. Discuss eligibility with your GP or through NHS specialist services.
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.