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's 90kg in Stone and What's Your BMI?
90kg equals 14 stone and 3 pounds in UK measurements. However, whether this is a healthy weight depends entirely on your height. Your BMI at 90kg ranges from underweight to obese depending on how tall you are. Use our free BMI calculator above to find your exact BMI and NHS health category based on your personal height and weight. This guide shows you what 90kg means across different heights and explains NHS weight categories.
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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
Your BMI at 90kg varies significantly with height. Here are six examples showing how the same weight gives different health categories:
- 5ft 2in (158cm) — BMI 36.4 (Obese Class II)
- 5ft 6in (168cm) — BMI 31.7 (Obese Class I)
- 5ft 10in (178cm) — BMI 29.1 (Overweight)
- 6ft (183cm) — BMI 26.8 (Healthy weight)
- 6ft 2in (188cm) — BMI 24.9 (Healthy weight)
- 6ft 4in (193cm) — BMI 23.3 (Healthy weight)
These examples show why height matters so much. The same 90kg weight (14 stone 3lbs) is obese for shorter adults but perfectly healthy for taller adults. Calculate your personal BMI using the free tool on this page to see exactly where you sit in the NHS categories.
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.
Understanding Your BMI Category
According to NHS guidelines, healthy weight falls between BMI 18.5 and 24.9. At 90kg, you could be in any category from healthy weight to obese depending on your height. BMI is a useful screening tool, but it has limitations — it doesn't distinguish between muscle and fat, so athletes may have a high BMI but low body fat. Waist measurement also matters: for men, over 94cm increases risk; for women, over 80cm increases risk. Your GP can provide personalised advice about whether 90kg is a healthy weight for you and your individual health circumstances.
- 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?
It depends on your height. At 90kg, you could be in the healthy weight, overweight, or obese category according to NHS guidelines. A person who is 6ft tall at 90kg has a BMI of 26.8 (overweight but close to healthy). Someone 5ft 4in at 90kg has a BMI of 36.4 (obese). Use our BMI calculator on this page to find your exact category based on your height.
What is 90kg converted to stone and pounds?
90kg converts to 14 stone and 3 pounds (or 14.2 stone). You can use our weight converter above to switch between kilogrammes, stone, and pounds instantly. The exact conversion is 90kg ÷ 6.35029 = 14.18 stone.
What's a healthy weight if I'm the same height?
Healthy weight depends on your height. For example, at 5ft 8in, a healthy weight range is roughly 55–75kg (8st 10lbs to 11st 10lbs). At 6ft, healthy weight is roughly 65–82kg (10st 3lbs to 12st 12lbs). Use our free BMI calculator to find your specific healthy weight range based on your exact height.
Does muscle affect BMI at 90kg?
Yes. BMI doesn't distinguish between muscle and fat. A muscular person at 90kg might have a high BMI but low body fat, while someone with less muscle at the same weight might be overweight. Your GP or a healthcare professional can assess your overall health beyond BMI alone.
How can I track my weight progress from 90kg?
You can use our free progress tracker to log your weight regularly and see trends over time. Tracking helps you stay motivated and identify patterns. Combine this with our GLP-1 weight loss calculator if you're considering prescription weight loss support, or our BMI calculator to monitor your health category as your weight changes.
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.