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 91 Kg in Stone?
91 kilograms is equal to 14 stone and 4.1 pounds (14st 4lbs). To convert kilograms to stone using the standard conversion method, divide your weight in kg by 6.35029. At 91kg, you're above the UK average adult weight. Understanding your weight in both metric and imperial units helps you track your health against NHS guidelines and manage your progress effectively. Use our free weight converter above to switch between kg, stone, and pounds instantly.
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.
91 Kg to Stone Conversion Table
91 kg = 14 stone 4.1 pounds
To convert 91 kilograms to stone, the formula is: weight in kg ÷ 6.35029 = weight in stone. For 91kg, this gives 14.33 stone, which breaks down as 14 full stones plus 0.33 × 14 pounds = 14st 4.6lbs.
Here's how 91kg compares to nearby values:
- 87 kg = 13 stone 9.2 lbs
- 89 kg = 14 stone 0.3 lbs
- 90 kg = 14 stone 2.2 lbs
- 91 kg = 14 stone 4.1 lbs
- 92 kg = 14 stone 6.0 lbs
- 93 kg = 14 stone 8.0 lbs
- 95 kg = 14 stone 11.8 lbs
This conversion helps you compare your weight against NHS health guidelines and understand UK weight classifications.
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.
BMI and Healthy Weight Context at 91 Kg
At 91kg, your BMI depends on your height. For example, at the average UK adult height of 5ft 6in (167cm), a weight of 91kg gives a BMI of approximately 32.6, which falls into the obese (Class I) range according to NHS guidelines. However, BMI alone doesn't account for muscle mass or where fat is stored. Our free BMI calculator above gives your personal BMI and shows you where you sit against NHS healthy weight ranges. A healthy weight for someone 5ft 6in tall is approximately 50–68kg. If you're concerned about your weight and health, your GP can provide personalised guidance based on your individual circumstances and medical history.
- 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 6.35029 to get 14.33 stone. The 0.33 remainder converts to pounds: 0.33 × 14 = 4.6 pounds. So 91kg = 14 stone 4 pounds. You can also use our free weight converter on this page for instant conversions.
Is 91 kg overweight for an adult?
Whether 91kg is overweight depends on your height. At the average UK height of 5ft 6in, it gives a BMI of around 32.6 (obese range). At taller heights like 5ft 10in, the same weight may fall into the overweight range. Check your personal BMI using our free calculator to see where you sit.
What is the healthy weight range at 91 kg's height equivalent?
At 5ft 6in (167cm), the NHS healthy weight range is approximately 50–68kg. At 91kg, this is considerably above the healthy range. However, healthy weight depends on individual factors including muscle mass, bone density, and overall health. Consult your GP for personalised advice.
Can I use this conversion for fitness tracking?
Yes, absolutely. Many UK fitness apps and weight loss programmes use stone for body weight. Understanding your weight in both kg and stone helps you track progress consistently. Try our free progress tracker to log your weight and monitor changes over time.
What's the difference between stone and kilogram measurements?
Stone is a UK imperial unit; 1 stone = 6.35kg exactly. Kilograms are metric and used internationally. The NHS uses kg clinically, but UK adults typically discuss weight in stone. Both are equally valid—use whichever feels most natural to you.
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.