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?
90 kilograms converts to 14 stone and 2 pounds (14st 2lbs) using the standard UK conversion. This weight falls into the obese category according to NHS guidelines for most adults, depending on height. Understanding your weight in both metric and imperial units is helpful when discussing health with your GP or using NHS health information. Use our free weight converter above to switch between kg, stone, and pounds instantly, or continue reading for UK health context and BMI information specific to this weight.
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.
90kg in UK Health Context
At 90kg (14st 2lbs), your health outcomes depend on your height and individual circumstances. According to NHS guidance, adults with a BMI of 30 or above are classed as obese, and those with a BMI of 40 or above face significantly increased health risks. At 90kg, your BMI depends on your height:
- If you're 5ft 4in (163cm): BMI approximately 37 (Class II obesity)
- If you're 5ft 7in (170cm): BMI approximately 35 (Class II obesity)
- If you're 5ft 10in (178cm): BMI approximately 32 (Class I obesity)
- If you're 6ft (183cm): BMI approximately 29.8 (overweight, just below obese threshold)
The NHS recommends discussing weight with your GP if your BMI is 25 or above, or if you have weight-related health conditions like type 2 diabetes, high blood pressure, or sleep apnoea. Calculate your personal BMI using our free BMI calculator on this page.
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 Weight Management Support & Next Steps
If you weigh 90kg and are concerned about your health, the NHS offers support through its weight management pathway. Your GP can refer you to local weight management services, which may include digital programmes, group support, or specialist clinic access depending on your area. For sustainable weight loss, the NHS recommends losing 0.5 to 1kg per week through a combination of reduced-calorie eating and increased physical activity. Even a 5–10% reduction in body weight can improve blood pressure, blood sugar control, and overall health. Track your progress with our free progress tracker, and always consult your GP before starting any weight loss programme or medication.
- 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 90kg in stone and pounds?
90kg converts to 14 stone and 2 pounds (14st 2lbs). To calculate this, divide 90 by 6.35029 (the conversion factor) to get 14.17 stone. The decimal converts to approximately 2.4 pounds, so the rounded result is 14st 2lbs.
What is my BMI if I weigh 90kg?
Your BMI at 90kg depends on your height. At 5ft 7in (170cm), your BMI would be approximately 35 (Class II obesity). At 5ft 10in (178cm), it would be about 32 (Class I obesity). Use our free BMI calculator above to calculate your exact BMI based on your specific height and weight.
Is 90kg overweight according to NHS guidelines?
At 90kg, whether you're overweight or obese depends on your height. For most adult heights, 90kg puts you into the obese category (BMI 30+) or close to it. The NHS recommends a healthy weight range of BMI 18.5–24.9. Discuss your weight with your GP if you're concerned, as health risks depend on factors beyond BMI alone.
How much weight would I need to lose to reach a healthy weight at 90kg?
The amount depends on your height. At 5ft 7in, a healthy weight range is approximately 52–69kg (8st 3lbs to 10st 12lbs), meaning you might aim for a 20–30kg loss. At 5ft 10in, the range is approximately 57–76kg (9st to 12st), requiring a 14–25kg loss. Your GP can help set realistic, personalised targets.
Can prescription weight loss medication help at 90kg?
Adults with a BMI of 30 or above, or 27+ with weight-related health conditions, may be eligible for prescription weight loss treatment. However, eligibility is assessed on an individual basis by a GP or licensed prescriber through a clinical assessment. Try our free GLP-1 weight loss calculator to see projected outcomes with weight loss medication.
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.