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 is 91kg in Stone and Pounds?
91kg is equivalent to 14 stone and 5 pounds (or 14st 5lbs). If you're tracking your weight using UK measurements, understanding how to convert between kilograms and stone is essential for health planning. Using our free weight converter, you can switch between metric and imperial units instantly. At 91kg, your health context depends on your height, age, and overall fitness — which is why personalised NHS guidance from your GP is always valuable when thinking about weight management.
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.
91kg Health Context and BMI
At 91kg, your health status depends entirely on your height. Use our free BMI calculator above to check your personal BMI instantly — this gives you a clearer picture of whether 91kg is in a healthy range for your specific height.
- If you're 5ft 8in (173cm) tall, a weight of 91kg gives a BMI of approximately 30.5, which falls into the obese category according to NHS guidelines
- If you're 5ft 10in (178cm) tall, 91kg gives a BMI of around 28.4, which falls into the overweight category
- If you're 6ft (183cm) tall, 91kg gives a BMI of approximately 27.2, still in the overweight range
For adults of South Asian, Chinese, Black African, or Black Caribbean heritage, NHS guidance recommends lower BMI thresholds, meaning health risk may be relevant at a lower weight. These ethnic groups face higher cardiovascular and metabolic risk at the same BMI as other populations.
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.
Healthy Weight Range and Weight Management at 91kg
The NHS recommends a healthy BMI range between 18.5 and 24.9 for most adults. Your healthy weight range depends on your height — for example, at 5ft 8in, a healthy weight would be approximately 55–75kg. If you're currently at 91kg and interested in weight management, evidence-based approaches include reducing calorie intake gradually, increasing physical activity, and seeking support from your GP.
For some adults, prescription weight loss medications may support your journey alongside lifestyle changes. GLP-1 medications like Wegovy (semaglutide) are licensed in the UK for weight management in adults with a BMI of 30 or above, or 27 or above with weight-related health conditions. These are prescription-only and require clinical assessment. Try our GLP-1 weight loss calculator to explore potential outcomes with different doses.
- 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 do I convert 91kg to stone and pounds?
Divide 91 by 6.35 to get stone (14.33 stone). Multiply the decimal (0.33) by 14 to get pounds (4.6 pounds). So 91kg = 14 stone 5 pounds (14st 5lbs). Use our free weight converter above for instant conversions.
Is 91kg a healthy weight?
It depends on your height. Calculate your BMI using our free BMI calculator on this page — if your BMI is between 18.5 and 24.9, you're in a healthy range. At 91kg, most adults will be in the overweight or obese BMI category, but your GP can provide personalised advice based on your health profile.
What is the healthy weight range if I'm 5ft 8in tall?
For someone 5ft 8in (173cm) tall, the healthy BMI range (18.5–24.9) corresponds to approximately 55–75kg. At 91kg, you'd be above this range. Your GP can discuss sustainable weight management options tailored to your circumstances.
Can I lose weight with GLP-1 medication at 91kg?
If you have a BMI of 30 or above, or 27 or above with weight-related health conditions, you may be eligible for prescription weight loss medication like Wegovy (semaglutide). Clinical trials showed average weight loss of around 15% body weight. You must be clinically assessed by a GP or licensed prescriber first — these are prescription-only medicines.
How quickly can I safely lose weight from 91kg?
The NHS recommends losing 0.5–1kg per week for sustainable results. This typically requires a calorie deficit of approximately 500 calories per day. Faster weight loss increases the risk of muscle loss and nutrient deficiency. Your GP or a registered dietitian can help you create a safe, sustainable plan.
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.