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
Is 90.9 kg a Healthy Weight?
90.9 kg is equivalent to 200.4 lbs, but whether this is a healthy weight for you depends entirely on your height. A weight that is healthy for someone 6 feet tall would be overweight for someone 5 feet 4 inches. This guide shows you how to assess your personal weight using NHS guidelines, explains healthy weight ranges for different heights, and helps you understand what your weight means for your health. Use our free BMI calculator above to check your exact BMI 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.
Healthy Weight Ranges by Height
At 90.9 kg (200.4 lbs), whether you are in a healthy weight range depends on your height. The NHS uses BMI (body mass index) to define healthy weight ranges. Here are three examples:
- 5ft 4in (163cm): Healthy weight is 49–65 kg. At 90.9 kg, you would be in the overweight range.
- 5ft 8in (173cm): Healthy weight is 55–75 kg. At 90.9 kg, you would be in the overweight range.
- 6ft 0in (183cm): Healthy weight is 60–82 kg. At 90.9 kg, you would be approaching the overweight boundary and may be moving toward it depending on your exact height within this range.
To convert your weight between kg and stone, use our free weight converter above. Remember that BMI does not account for muscle mass — athletes may have a higher BMI but lower body fat.
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.
NHS Guidance and What to Do Next
The NHS recommends a healthy BMI between 18.5 and 24.9, which corresponds to different weight ranges at each height. If you're above this range, your GP can offer practical support. This might include dietary advice, physical activity recommendations, or referral to a weight management service. Waist circumference also matters: the NHS suggests men keep waist measurements under 94 cm (37 inches) and women under 80 cm (31.5 inches) to reduce health risks. Weight loss of even 5–10% of your current body weight can significantly improve blood pressure, blood sugar control, and overall health. Speak to your GP about what's realistic for you.
- 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 is approximately 14 stone 5 lbs (or 200.4 lbs). To convert kilograms to stone accurately, divide the kg amount by 6.35. Our free weight converter above will give you the exact conversion in seconds.
Is 90.9 kg overweight for all heights?
No. At 90.9 kg, you would be in a healthy range if you are taller than about 6ft 1in. For most average heights (5ft 4in to 5ft 10in), this weight would fall into the overweight category. Your height determines your healthy weight range.
How do I know my healthy weight range?
Calculate your BMI using the free BMI calculator on this page — it will tell you instantly whether your weight is in the healthy, overweight, or obese range for your exact height. Alternatively, multiply your height in metres squared by 18.5 and 24.9 to find your healthy weight range.
What if my weight is above the healthy range?
The NHS recommends speaking to your GP. They can discuss sustainable weight loss (typically 0.5–1 kg per week), dietary changes, physical activity, and whether any support services are available in your area. Losing even 5% of your body weight has measurable health benefits.
Does BMI account for muscle mass?
No. BMI does not distinguish between muscle and fat. Athletes or very muscular individuals may have a higher BMI but healthy body fat levels. Waist measurement is a helpful additional check — your GP can advise on your personal health picture.
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.