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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90kg Into Stone — Is This a Healthy Weight?
90kg converts to 14 stone 3lbs in UK measurements. Whether this is a healthy weight depends entirely on your height. The NHS uses BMI (body mass index) to determine healthy weight ranges, and at 90kg, your BMI will fall into different categories depending on how tall you are. Use our free BMI calculator above to find your personal BMI instantly, or read on to see three concrete examples of what 90kg means at different heights.
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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.
Healthy Weight Ranges by Height at 90kg
The table below shows what a weight of 90kg (14 stone 3lbs) means for adults at different heights, according to NHS guidelines:
- At 1.65m (5ft 5in): BMI of 33.1 — falls in the obese category. Healthy weight range for this height is 50–68kg (7st 12lbs–10st 10lbs).
- At 1.75m (5ft 9in): BMI of 29.4 — falls in the overweight category. Healthy weight range for this height is 56–77kg (8st 12lbs–12st 1lb).
- At 1.85m (6ft 1in): BMI of 26.3 — falls in the healthy weight category. Healthy weight range for this height is 63–87kg (9st 13lbs–13st 10lbs).
As you can see, the same weight (90kg into stone as 14st 3lbs) is healthy for taller adults but overweight for shorter adults. Your height is the key factor in determining whether 90kg is right for you.
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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.
NHS Guidance: What to Do If You're Outside Your Healthy Range
If your BMI falls outside the healthy range (18.5–24.9), the NHS recommends working towards your personalised healthy weight range. Even losing 5–10% of your body weight can bring meaningful health improvements. Sustainable weight loss typically happens at a rate of 0.5–1kg per week, achieved through a combination of balanced eating and increased physical activity.
Waist measurement is also important: men over 94cm (37in) and women over 80cm (31.5in) face increased health risks. Your GP can offer personalised guidance and may refer you to weight management support. Try our free weight converter to track your weight in both kg and stone as you progress.
- 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 90kg in stone and pounds exactly?
90kg equals 14 stone 3.1lbs (or approximately 14 stone 3lbs). To convert any weight from kilograms to stone, divide the kg figure by 6.35029. You can also use our free weight converter above to switch between kg, stone, and lbs instantly.
Is 90kg overweight or healthy?
It depends on your height. At 90kg, someone who is 1.85m (6ft 1in) tall would have a healthy BMI of 26.3. But someone 1.65m (5ft 5in) tall would have a BMI of 33.1, which is obese. Use our BMI calculator to find your personal BMI and see your healthy weight range.
What is the healthy weight range for an adult?
According to NHS guidelines, a healthy BMI is between 18.5 and 24.9. For adults of South Asian, Chinese, Black African, or Black Caribbean heritage, the NHS recommends a slightly lower range of 18.5–22.9. Your GP can advise on what's healthy for you personally.
How much weight should I aim to lose per week?
The NHS recommends losing no more than 0.5–1kg (1–2lbs) per week for sustainable, healthy weight loss. This typically requires a calorie deficit of around 500 calories per day. Track your progress using our free progress tracker to stay motivated and accountable.
What should I do if my BMI is above the healthy range?
Start by speaking with your GP, who can assess your individual health and refer you to weight management support if appropriate. The NHS offers tier 1 digital tools and community programmes, and specialist services are available for those who need more support. Small, consistent changes to diet and activity levels are most effective long-term.
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.