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 Kilos In Stones And Pounds — Healthy Weight Guide
91 kilograms converts to 14 stone and 4 pounds (14st 4lbs). But whether this is a healthy weight for you depends entirely on your height. The same weight can be perfectly healthy for a tall adult and overweight for a shorter adult. This guide shows you how to check if 91kg is healthy for your individual height using NHS standards, plus how to convert kilograms to stone accurately.
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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.
Healthy Weight Ranges At Different Heights
At 91kg, your weight status depends on where you fall on the kg to stone conversion chart. Using the standard metric to imperial weight conversion, 91kg equals 14st 4lbs. To assess whether this is healthy for you, we need to look at BMI (body mass index), which considers both weight and height together.
Here's how 91kg compares across different heights using NHS guidelines:
- 5ft 4in (163cm): BMI of 34.4 — falls in the obese range. Healthy weight range would be 47–63kg (7st 6lbs to 9st 11lbs).
- 5ft 9in (175cm): BMI of 26.8 — falls in the overweight range. Healthy weight range would be 56–76kg (8st 11lbs to 11st 12lbs).
- 6ft 1in (185cm): BMI of 25.3 — falls in the healthy weight range. Healthy weight range would be 64–87kg (10st 1lbs to 13st 9lbs).
Use our free BMI calculator above to check your exact BMI based on your own height and 91kg weight.
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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.
Understanding If 91kg Is Right For You
The NHS recommends a healthy BMI of 18.5 to 24.9 for most adults. If you're over 91 kilos or concerned about your weight, it's worth measuring your waist circumference too — this measures where fat is stored and is important for health. Men should aim for under 94cm (37in); women under 80cm (31.5in).
If 91kg puts you outside a healthy range for your height, a GP can offer support through NHS weight management services, or you can start with our free weight converter and progress tracker to monitor changes over time. Even losing 5–10% of body weight brings real health benefits including better blood pressure and blood sugar control.
- 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.
What is 91kg in stones and pounds exactly?
91 kilograms converts to 14 stone and 4 pounds (14st 4lbs). To convert kilograms to stone accurately, divide 91 by 6.35029. You can also use our free weight converter above to switch between kg, stone, and pounds instantly.
Is 91kg overweight or a healthy weight?
It depends on your height. At 5ft 4in, 91kg gives a BMI of 34 (obese). At 5ft 9in, it's 27 (overweight). At 6ft 1in, it's 25 (healthy). Use our BMI calculator to check your personal status based on your exact height.
What should I weigh if I'm 5ft 9in tall?
For someone 5ft 9in (175cm), the NHS healthy weight range is 56–76kg (8st 11lbs to 11st 12lbs). At 91kg, you'd be in the overweight category. A GP or registered weight loss provider can help you reach a healthier range safely.
How do I know if my weight is affecting my health?
Waist measurement is important too. Men should aim for under 94cm; women under 80cm. High waist measurement increases health risks even at a moderate BMI. Your GP can assess your individual health risk and suggest next steps, including NHS weight management services if needed.
Can I lose weight safely from 91kg?
The NHS recommends losing 0.5–1kg per week for sustainable results. Try our free progress tracker to log your weight and monitor progress. Combine small calorie reductions with increased physical activity. If you'd like help, your GP can refer you to specialist weight management support or discuss prescription options.
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.