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 120kg a Healthy Weight in the UK?
120kg converts to 18 stone 12 pounds — but whether this weight is healthy entirely depends on your height. For some adults, 120kg falls within a healthy weight range; for others, it indicates overweight or obesity according to NHS guidelines. Your BMI (body mass index) is the key measure used by the NHS to assess weight health. The good news is that even modest weight changes can significantly improve your health. Let's look at what 120kg means for your specific height and what the NHS recommends.
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.
What Does 120kg Mean at Different Heights?
120kg in stone is 18 stone 12 pounds — but your height is crucial to assessing whether this is a healthy weight for you. The same weight can be healthy at one height and overweight at another. Here's what this weight means at three common UK heights:
- At 5ft 6in (168cm): 120kg gives a BMI of 38.6 — classified as obese (Class II) by NHS standards
- At 5ft 10in (178cm): 120kg gives a BMI of 32.2 — classified as obese (Class I) by NHS standards
- At 6ft 1in (185cm): 120kg gives a BMI of 28.9 — classified as overweight by NHS standards
Use our free BMI calculator above to find your exact BMI instantly using your own height and weight. You can also use the weight converter to switch between kilograms, stone, and pounds as needed.
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 Healthy Weight Ranges and Next Steps
For UK adults, the NHS recommends a healthy BMI range of 18.5 to 24.9. At 120kg, most adults would fall outside this range unless very tall. However, losing even 5–10% of your body weight (roughly 6–12kg from 120kg) can significantly improve health markers including blood pressure, blood sugar control, and cholesterol levels. Your waist measurement also matters: men should aim for under 94cm (37 inches), women under 80cm (31.5 inches) for reduced health risk. If you're concerned about your weight, speak with your GP, who can assess your individual health and discuss options including lifestyle changes, dietary support, or referral to specialist weight management services.
- 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 120kg in stones and pounds?
120kg equals 18 stone and 12 pounds (or 18.9 stone). To convert kilograms to stone, divide the kg amount by 6.35. Our free weight converter on this page makes the conversion instant across all metric and imperial units.
Is 120kg healthy?
It depends on your height. At 120kg, BMI ranges from approximately 28.9 (at 6ft 1in) to 38.6 (at 5ft 6in). The NHS considers healthy BMI as 18.5–24.9. Use our BMI calculator above to check your personal BMI and see where you fall on the NHS health ranges.
What's the healthy weight range for my height?
Healthy weight varies by height. At 5ft 8in, healthy weight is roughly 55–74kg. At 5ft 10in, it's 58–78kg. Your GP can advise on your specific healthy range, or use our BMI calculator to find the healthy weight band for your exact height instantly.
How much weight would I need to lose to be in a healthy BMI range from 120kg?
This depends on your height. At 5ft 8in, you'd need to reach approximately 75kg or lower. At 6ft tall, approximately 88kg. Even losing 5–10% of body weight (6–12kg) has significant health benefits. Your GP can advise on a realistic, sustainable target for you.
What should I do if I'm concerned about my weight?
Speak with your GP, who can assess your individual health, discuss any underlying factors affecting weight, and explore options including lifestyle changes, dietary support, or referral to NHS specialist weight management services. The NHS Weight Loss Plan and community programmes are available in many areas.
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.