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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What is 91.7kg in Stone? BMI and Health Context
91.7kg is approximately 14 stone 6 pounds in UK measurements. However, your BMI — which is the key health indicator — depends entirely on your height. At different heights, this weight produces very different BMI results, ranging from healthy weight to overweight or obese according to NHS guidelines. Use our free BMI calculator above to find your exact BMI, or read on to see how 91.7kg compares at various 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.
91.7kg BMI at Different Heights
Converting 91.7kg to stone: To convert kilograms to stone using the standard conversion, 91.7kg equals 14 stone 6.2 pounds exactly.
Your BMI at 91.7kg varies significantly by height. Here's what this weight means in NHS BMI categories:
- At 160cm (5ft 3in): BMI 35.8 — Obese (Class II)
- At 168cm (5ft 6in): BMI 32.5 — Obese (Class I)
- At 175cm (5ft 9in): BMI 30.0 — Obese (Class I) — just at the threshold
- At 180cm (5ft 11in): BMI 28.3 — Overweight
- At 185cm (6ft 1in): BMI 26.8 — Overweight
- At 190cm (6ft 3in): BMI 25.3 — Healthy weight
These examples show why height is crucial when interpreting weight. The same weight in kilos to stone produces very different health implications.
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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.
Understanding Your BMI and NHS Categories
The NHS classifies BMI ranges to help assess health risk. A BMI under 18.5 is underweight; 18.5–24.9 is healthy weight; 25.0–29.9 is overweight; 30.0–34.9 is obese (Class I); 35.0–39.9 is obese (Class II); and 40.0 and above is severely obese (Class III). Remember that BMI has limitations — it doesn't distinguish between muscle and fat, and it doesn't account for where your body stores fat. For adults of South Asian, Chinese, Black African, or Black Caribbean heritage, the NHS recommends lower BMI thresholds due to higher health risks at these weights. Always consult your GP for personalised health advice about your weight.
- 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 91.7kg in stone and pounds?
91.7kg converts to 14 stone 6.2 pounds. To calculate: divide 91.7 by 6.35029 to get stone, then multiply the decimal by 14 to get additional pounds. Use our free weight converter above for instant conversions between kg, stone, and pounds.
Is 91.7kg a healthy weight?
It depends on your height. At 91.7kg, you could have a healthy BMI (if you're 190cm or taller) or be in the obese category (if you're shorter than 160cm). Calculate your personal BMI using the BMI calculator on this page to find out your exact health category.
What's the healthy weight range for someone at 91.7kg?
This varies by height. At 175cm, a healthy weight is 55–76kg. At 180cm, it's 60–81kg. At 185cm, it's 63–86kg. Use the weight converter and BMI calculator to check the healthy range for your specific height.
Why does height matter so much for BMI?
BMI divides weight by height squared. Taller people can carry more weight while maintaining the same BMI. A 91.7kg person who is 190cm tall has a healthy BMI, but the same weight at 160cm indicates obesity because the weight is distributed over a shorter frame.
Should I lose weight if I'm 91.7kg?
That depends on your height, BMI, and overall health. Your GP can advise you personally. If your BMI is in the overweight or obese range, losing even 5–10% of your body weight can improve your health. Evidence-based approaches include calorie deficit, increased physical activity, and where appropriate, prescription weight loss 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.