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 BMI Is 91kg? Convert to Pounds & Check Your Health Range
91 kilograms equals 200.6 pounds. However, whether this weight is healthy for you depends entirely on your height. BMI (Body Mass Index) is the NHS standard measurement that combines your weight with your height to determine if you're in a healthy range. Use our free BMI calculator above to find your exact BMI, or read on to see what BMI 91kg gives you at common UK adult heights and which NHS health category you fall into.
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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 BMI at Different Heights — NHS Categories
At 91kg, your BMI varies significantly depending on your height. Here's what this weight gives you at typical UK adult heights, using NHS BMI categories:
- 5ft 4in (163cm): BMI 34.2 — Obese (Class I)
- 5ft 6in (168cm): BMI 32.2 — Obese (Class I)
- 5ft 8in (173cm): BMI 30.4 — Obese (Class I)
- 5ft 10in (178cm): BMI 28.6 — Overweight
- 6ft 0in (183cm): BMI 27.2 — Overweight
- 6ft 2in (188cm): BMI 25.7 — Healthy weight
A healthy BMI according to NHS guidelines is between 18.5 and 24.9. At 91kg, only taller adults (above approximately 185cm or 6ft 1in) would fall within the healthy range. Try the weight converter on this page to see 91kg in stone and pounds, and use our BMI calculator to check your personal result.
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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.
NHS BMI Categories & Important Limitations
The NHS uses these BMI categories for adults: Underweight (below 18.5), Healthy weight (18.5–24.9), Overweight (25–29.9), Obese Class I (30–34.9), Obese Class II (35–39.9), and Severely obese (40+). However, BMI has real limitations — it doesn't distinguish between muscle and fat, so athletes or very muscular people may have a high BMI despite low body fat. BMI also doesn't account for where fat is stored; waist circumference matters too. For people of South Asian, Chinese, Black African, or Black Caribbean heritage, the NHS recommends lower BMI thresholds because these groups face higher health risks at the same BMI. Always discuss your personal healthy weight with your GP.
- 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?
It depends on your height. At 91kg, most adults under 183cm (6ft) fall into the overweight or obese category according to NHS guidelines. Use the BMI calculator on this page to check your personal BMI. If you're concerned about your weight, your GP can give personalised advice based on your health and individual circumstances.
How many pounds is 91 kilograms?
91kg equals 200.6 pounds. To convert kilograms to pounds, multiply by 2.20462. You can also use our free weight converter above to switch between kg, stone, and pounds instantly — the metric to imperial weight conversion works both ways.
What's the healthy weight range at my height if I weigh 91kg?
Your healthy weight range depends on your height. Use our BMI calculator to find your exact healthy weight band. For example, at 5ft 8in (173cm), the healthy weight range is roughly 55–74kg. Your GP can also advise you on a realistic and sustainable healthy weight for your individual health profile.
Does BMI matter if I'm muscular or athletic?
BMI is less accurate if you have high muscle mass, as muscle weighs more than fat. BMI is best used as a general screening tool alongside other measurements like waist circumference. Your GP can assess your overall health through multiple indicators, not just BMI. If you're very athletic, discuss your weight with a healthcare professional rather than relying on BMI alone.
Can I use 91kg to calculate my ideal weight?
Your ideal weight depends on many factors including your height, age, gender, genetics, and muscle mass. The NHS healthy weight range for your height is a good starting point — use our BMI calculator to find it. For personalised guidance on what weight is right for you, speak with your GP or a registered dietitian who can consider your individual health situation.
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.