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 90kg in Stone and What Does It Mean for BMI?
90kg converts to 14 stone 2.2lbs in UK measurements. However, whether this weight is healthy depends entirely on your height — the same weight gives a very different BMI for a 5ft 2in person compared to a 6ft 2in person. Use our free BMI calculator above to check your personal BMI instantly, or read on to see how 90kg translates to BMI at common heights and what the NHS categories mean for your health.
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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.
90kg BMI at Different Heights
Since BMI is calculated using both weight and height, a weight of 90kg produces different BMI values depending on how tall you are. Here's what 90kg gives you at standard UK heights:
- At 5ft 4in (163cm): BMI of 34.9 — falls in the Obese Class I category
- At 5ft 6in (168cm): BMI of 32.1 — falls in the Obese Class I category
- At 5ft 8in (173cm): BMI of 29.6 — falls in the Overweight category (just under obese threshold)
- At 5ft 10in (178cm): BMI of 27.3 — falls in the Overweight category
- At 6ft (183cm): BMI of 25.3 — falls in the Healthy weight category
- At 6ft 2in (188cm): BMI of 23.5 — falls in the Healthy weight category
These examples show how height dramatically changes what the same weight means for your health. To find your exact BMI using the kg to stone metric, calculate it with our weight converter and BMI calculator above.
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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 and What They Mean
The NHS uses standardised BMI categories to assess weight-related health risk. A BMI below 18.5 is underweight, 18.5–24.9 is healthy weight, 25–29.9 is overweight, and 30 and above is obese. However, BMI has important limitations — it doesn't distinguish muscle from fat, so athletes may have a high BMI without excess body fat. For adults of South Asian, Chinese, Black African, or Black Caribbean heritage, the NHS recommends lower BMI thresholds because these groups face higher health risks at lower weights. If you're 90kg and your BMI falls in the overweight or obese category, your GP can discuss your individual health context and whether lifestyle changes or support might be helpful.
- 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 90kg overweight or obese?
At 90kg, whether you're overweight or obese depends on your height. Use our free BMI calculator above to find your exact BMI. Generally, if you're under 5ft 8in, you're likely in the obese category; if you're taller, you may be in the overweight category or even healthy weight range.
What's the healthy weight range at my height if I weigh 90kg?
The healthy weight range depends on your height. For example, at 5ft 8in it's roughly 54–71kg; at 5ft 10in it's 58–77kg. Use our weight converter to check your height-specific healthy range, or try the BMI calculator to see where you fall now.
How do I convert 90kg to stone and pounds?
90kg equals 14 stone 2.2lbs (or approximately 14st 2lbs). To convert kilograms to stone, divide by 6.35. Our free weight converter above will do this instantly for any weight.
Is 90kg a healthy weight for an adult?
Health at 90kg depends on height, age, muscle mass, and overall fitness. The NHS uses BMI as a screening tool, but it has limitations. Your GP can assess your individual health and discuss whether your current weight is healthy for you specifically.
What's my BMI if I weigh 90kg?
Your BMI depends on your height. BMI = weight (kg) ÷ height (m)². For example, at 5ft 8in, 90kg gives a BMI of 29.6. Use our free BMI calculator on this page to find your exact BMI in seconds.
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.