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
90.9 kg to Lbs — What's Your BMI?
90.9 kg converts to 200.2 pounds, but what matters for your health is your BMI — and that depends on your height. At 90.9 kg, you could be in the overweight or obese category according to NHS guidelines, depending on how tall you are. Use our free BMI calculator above to check your personal BMI instantly, or explore the weight categories below for different heights to understand where you fall on the NHS health scale.
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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.
90.9 kg BMI at Different Heights
90.9 kg is a significant weight, and your BMI tells you whether it's a health concern for your height. Here's what your BMI would be at common UK heights:
- 5ft 2in (157cm): BMI 37.0 — Obese (Class I)
- 5ft 6in (168cm): BMI 32.8 — Obese (Class I)
- 5ft 10in (178cm): BMI 30.3 — Obese (Class I)
- 6ft 0in (183cm): BMI 27.9 — Overweight
- 6ft 3in (190cm): BMI 25.2 — Healthy weight
To convert kilograms to stone, 90.9 kg equals 14 stone 5.2 lbs. These NHS categories guide whether your GP might recommend lifestyle changes or weight management support.
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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 NHS BMI Categories
The NHS classifies adult BMI into clear categories to help you understand health risk. A healthy BMI is 18.5 to 24.9. At 90.9 kg, most heights put you in overweight or obese categories. However, BMI has limitations — it doesn't account for muscle mass, frame size, or where fat is stored. If you're very muscular or athletic, your actual body composition may be healthier than BMI suggests. Your GP can assess your individual health and discuss whether weight management would benefit you, alongside other health markers like blood pressure and cholesterol.
- 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 90.9 kg in stone and pounds?
90.9 kg converts to 14 stone 5.2 lbs (or approximately 14 stone 5 lbs). To convert kilograms to stone, divide by 6.35. Use our free weight converter above to switch between metric and imperial measurements instantly.
Is 90.9 kg overweight or obese?
At 90.9 kg, whether you're overweight or obese depends on your height. For example, at 5ft 6in you'd be obese (BMI 32.8), but at 6ft 2in you'd be in the healthy range. Use our free BMI calculator above with your actual height to find your personal BMI category.
What should I weigh for a healthy BMI?
For a healthy BMI (18.5–24.9), a 5ft 8in adult should weigh between 55–75 kg (8st 9lbs to 11st 11lbs). At 5ft 10in, the range is 59–80 kg (9st 4lbs to 12st 8lbs). Your GP can discuss a realistic healthy weight range for your height, frame, and health goals.
Does muscle affect BMI?
Yes — BMI cannot distinguish between muscle and fat. Athletes or very muscular individuals may have a high BMI but low body fat, so BMI alone isn't the full picture. Your GP may assess waist circumference, blood pressure, and other markers alongside BMI for a complete health view.
How can I track weight loss?
Use our free progress tracker on this page to log your weight over time and see your progress visually. Combine this with our GLP-1 weight loss calculator to estimate potential results if you're considering weight management options. Regular tracking helps identify trends and keeps you motivated.
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.