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's 91kg in Stone? UK Conversion Guide
91kg converts to approximately 14 stone 5 pounds (14st 5lbs) using the standard UK weight conversion. This weight falls within the overweight to obese range according to NHS BMI guidelines, depending on your height. Understanding your weight in both metric and imperial measurements is helpful when discussing health with your GP or using UK health resources. Use our free weight converter above to check your exact measurement, and calculate your personal BMI to see what your weight means for your individual health.
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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.
91kg to Stone Conversion — The Exact Figure
To convert 91kg to stone, we divide by the standard conversion factor of 6.35029. 91kg = 14.33 stone, which breaks down as 14 stone and 5 pounds (14st 5lbs). This conversion is based on the exact metric-to-imperial relationship used across UK health services and NHS guidance.
- 91kg in stone only: approximately 14.33 stone
- 91kg in pounds only: approximately 200.6 lbs
- 91kg in stone and pounds: 14 stone 5 pounds
When discussing your weight with your GP or healthcare professional, both measurements are useful. The NHS uses kilograms for clinical measurements, but UK adults commonly refer to their weight in stone and pounds. Our free weight converter on this page lets you check conversions instantly between kg, stone, and lbs.
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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.
Is 91kg a Healthy Weight? NHS BMI Context
Whether 91kg is a healthy weight depends on your height. For someone 1.75m tall (5ft 9in), 91kg gives a BMI of approximately 29.7, which falls into the overweight category according to NHS guidelines (BMI 25–29.9). For someone 1.85m tall (6ft 1in), the same weight gives a BMI of about 26.6, also overweight. For someone 1.65m tall (5ft 5in), 91kg results in a BMI of approximately 33.4, which falls into the obese category (BMI 30+).
Use our free BMI calculator above to find your personal BMI and see what the NHS considers a healthy weight range for your specific height. Remember that BMI is a screening tool — your GP can provide personalised health advice based on your individual circumstances, fitness level, and any weight-related health conditions.
- 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?
Divide 91 by 6.35029 to get 14.33 stone, or 14 stone 5 pounds. You can use our free weight converter above for instant conversions between kg, stone, and pounds without doing the maths yourself.
What does 91kg mean for my health?
Your health depends on your height. Calculate your BMI using our free calculator above to see if 91kg falls within a healthy range for you. Your GP can provide personalised advice based on your individual health profile.
Is 91kg overweight or obese?
It depends on your height. At average UK heights, 91kg typically falls into the overweight to obese range (BMI 25–34+). Use our BMI calculator to check your exact category based on your height.
How do I know what weight is healthy for me?
The NHS recommends a BMI between 18.5 and 24.9 for most adults (lower for some ethnic groups). Use our free BMI calculator to find your healthy weight range based on your height. Your GP can also advise on what's right for you.
Can I use this conversion for health or fitness goals?
Yes — knowing your weight in both kg and stone helps you track progress and communicate with healthcare professionals. If you're working on weight management, our free progress tracker can help you log changes over time.
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.