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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91.7kg in Stone — Healthy Weight Guide
91.7kg converts to 14 stone 5 pounds. Whether this is a healthy weight entirely depends on your height, age, and overall health. The NHS uses BMI (Body Mass Index) to assess healthy weight ranges, and at 91.7kg, your health status could range from overweight to obese depending on how tall you are. Use our free BMI calculator above to check your personal BMI instantly, and see where you fall on the NHS health scale. This guide shows you healthy weight ranges for different heights and what the NHS recommends.
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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 91.7kg
At 91.7kg, whether your weight is healthy depends entirely on your height. Here are three concrete examples:
- If you are 5ft 6in (168cm): 91.7kg gives a BMI of 29.6 — classified as overweight by NHS standards. A healthy weight at this height is 50–67kg (7st 12lbs–10st 7lbs).
- If you are 5ft 10in (178cm): 91.7kg gives a BMI of 31.2 — classified as obese (Class I). A healthy weight at this height is 55–74kg (8st 9lbs–11st 8lbs).
- If you are 6ft 2in (188cm): 91.7kg gives a BMI of 25.9 — classified as overweight, just above the healthy range. A healthy weight at this height is 62–83kg (9st 11lbs–13st 1lbs).
The NHS healthy weight range for any height is a BMI of 18.5 to 24.9. For adults of South Asian, Chinese, Black African, or Black Caribbean heritage, the healthy range is lower: BMI 18.5 to 22.9.
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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 and What to Do Next
If 91.7kg is above the healthy weight range for your height, the NHS recommends aiming for a gradual, sustainable weight loss of 0.5–1kg per week. This typically requires a calorie deficit of around 500 kcal per day, achieved through balanced diet and increased physical activity. Waist measurement also matters: men should aim for under 94cm (37in), women under 80cm (31.5in). Your GP can assess your individual health and discuss whether prescription weight loss support, lifestyle changes, or other interventions are appropriate. Remember, even a 5–10% reduction in body weight can bring real health benefits. Try our free weight loss calculator to see projected outcomes, or use the weight converter on this page to understand your weight in different units.
- 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 many stone is 91.7kg exactly?
91.7kg converts to 14 stone and 5 pounds (14st 5lbs). To convert kilograms to stone, divide the kilogram amount by 6.35029. This conversion is exact and matches all UK weight measurement standards.
Is 91.7kg overweight or obese?
At 91.7kg, whether you are overweight or obese depends on your height. Use the BMI calculator on this page to find your personal BMI. Generally, 91.7kg results in overweight BMI for taller adults (5ft 10in+) and obese BMI for shorter adults (under 5ft 8in).
What is the healthy weight range at my height?
Healthy weight ranges vary by height. A healthy BMI is 18.5–24.9 according to NHS standards. At 91.7kg, use our BMI calculator to compare your BMI against the healthy range for your specific height. Your GP can also discuss a personalised healthy weight target.
How much weight would I need to lose from 91.7kg to be healthy?
This depends on your height. For a 5ft 8in adult, healthy weight is roughly 50–68kg, so losing 23–42kg would be needed. For a 5ft 11in adult, healthy weight is roughly 55–75kg, requiring 17–37kg loss. Your GP can advise on a realistic target for your individual circumstances.
Should I see my GP about my weight at 91.7kg?
Yes. If 91.7kg is above the healthy weight range for your height, it's worth discussing with your GP. They can assess your overall health, check for weight-related conditions, and discuss support options including lifestyle changes or, if appropriate, prescription weight management options alongside diet and exercise.
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.