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 90kg a Healthy Weight? Convert to Stone and Pounds
90kg is equivalent to 14 stone and 2 pounds (198.4 lbs). Whether this weight is healthy depends entirely on your height, age, and body composition. For some adults, 90kg falls within a healthy weight range; for others, it may indicate overweight or obesity according to NHS guidelines. The best way to understand if 90kg is right for your health is to calculate your BMI using our free BMI calculator above, which takes your height into account and compares your weight against NHS standards.
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 at Different Heights
A weight of 90kg can be healthy or overweight depending on your height. Here are three concrete examples showing how the same weight translates to different BMI categories:
- At 1.85m (6ft 1in): 90kg gives a BMI of 26.3 — falls in the overweight range (25.0–29.9)
- At 1.75m (5ft 9in): 90kg gives a BMI of 29.4 — at the upper end of overweight, approaching obesity threshold
- At 1.65m (5ft 5in): 90kg gives a BMI of 33.1 — falls in the obese range (Class I, 30.0–34.9)
You can check your personal BMI instantly using the weight converter and BMI calculator on this page — simply enter your height and weight to see where you fall on the NHS scale. Remember: BMI is a useful screening tool but doesn't account for muscle mass, where fat is stored, or individual health factors.
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 Next Steps
According to NHS guidelines, a healthy BMI is between 18.5 and 24.9. If your BMI at 90kg is above this range, the NHS recommends consulting your GP for personalised advice. Additional health markers matter too: waist circumference is important — men should aim for under 94cm (37in), women under 80cm (31.5in). If you're aiming to reach a healthier weight, the NHS suggests losing no more than 0.5–1kg per week for sustainable results. Your GP can discuss weight management options with you, including lifestyle changes, dietary support, or in some cases, prescription weight loss treatment if you're eligible.
- 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.
How do I convert 90kg to stone and pounds?
90kg equals 14 stone and 2 pounds (14st 2lbs), or 198.4 pounds. To convert kg to stone, divide by 6.35029. Use our free weight converter above for instant conversions between kg, stone, and pounds.
Is 90kg overweight?
It depends on your height. At 1.75m (5ft 9in), 90kg gives a BMI of 29.4, which is overweight. At 1.85m (6ft 1in), it's borderline overweight. Calculate your personal BMI using the calculator on this page to see your category.
What's the healthy weight range for someone who currently weighs 90kg?
This depends on your height. Our BMI calculator shows healthy weight ranges for your specific height. For example, at 1.75m, healthy weight is roughly 56–76kg; at 1.85m, it's roughly 63–82kg. Your GP can also advise your target range.
How much weight do I need to lose if I'm 90kg and overweight?
Consult your GP for a personalised target. Generally, losing even 5–10% of body weight (4.5–9kg) can improve blood pressure, blood sugar, and overall health. The NHS recommends aiming for 0.5–1kg weight loss per week.
Should I speak to my GP about my weight if I'm 90kg?
If your BMI at 90kg is above 25, it's worth discussing with your GP, especially if you have weight-related health conditions like high blood pressure or type 2 diabetes. Your GP can assess your individual health and suggest appropriate next steps.
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.