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?
91kg is equivalent to 14 stone and 5.6 pounds in UK measurements. This weight falls into the overweight category according to NHS guidelines for most adults. Understanding your weight in stone and pounds is important in the UK, where these are the standard measurements used by GPs and health services. Using our free weight converter, you can instantly switch between kilograms, stone, and pounds to get a clearer picture of your weight in measurements you're familiar with. Your NHS health team will use these conversions when discussing your health with you.
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.
How Does 91kg Compare to NHS Health Guidance?
According to NHS health guidelines, a weight of 91kg places most adults into the overweight category, depending on height. To determine your personalised health status, your BMI (body mass index) is calculated using both your weight and height. For example, a person 1.75m tall (5ft 9in) with a weight of 91kg would have a BMI of approximately 29.7, which falls just below the obese threshold. The NHS recommends a healthy weight BMI range of 18.5 to 24.9 for most adults, though these thresholds are lower for people of South Asian, Chinese, Black African, or Black Caribbean heritage. Use our free BMI calculator above to check your personal BMI and see where your weight sits in relation to NHS health guidance. This gives you a clearer understanding of whether 91kg is a healthy weight for your individual height and build.
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.
Managing Weight and Getting NHS Support
If you're concerned about your weight at 91kg, the NHS offers free weight management support through various tiers of care. Your GP can refer you to local weight management programmes, digital tools, and community support services without cost. For significant weight management, tier 3 specialist services are available through the NHS, though these typically have waiting lists. Many people find it helpful to track their progress using free weight loss tools and calculators to stay motivated. The NHS recommends losing weight gradually at a rate of 0.5 to 1kg per week for sustainable, healthy results. Whether you're aiming to reach a healthier BMI or simply want to understand your current weight better, your GP is always the best starting point for personalised health guidance tailored to your circumstances.
- 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.
Is 91kg overweight or obese according to NHS guidelines?
It depends on your height. 91kg may fall into either the overweight or obese category depending on your height. Use the BMI calculator on this page with your height to find out. Most adults at 91kg will have a BMI in the overweight or lower obese range. Your GP can advise you personally.
How many pounds is 91kg?
91kg equals approximately 200.6 pounds (or 14 stone 5.6 pounds in UK measurements). You can use our free weight converter above to switch between kilograms, stones, and pounds instantly.
What is a healthy weight range for my height if I weigh 91kg?
A healthy weight range depends entirely on your height. Use our BMI calculator to enter both your weight and height, and it will show you the healthy weight range for your specific height according to NHS guidelines. This gives you a personalised target.
Should I try to lose weight if I'm 91kg?
That's a question for your GP, as it depends on your individual health, height, age, and medical history. Your GP can assess whether weight loss would benefit your health and can refer you to free NHS support if appropriate.
Where can I find NHS weight management support in the UK?
Start by speaking to your GP, who can refer you to local weight management services. The NHS offers free programmes at tier 1 (self-help), tier 2 (primary care), and tier 3 (specialist services). Waiting times vary by region, but support is always available to UK residents.
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.