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
120kg in Stone — What's a Healthy Weight?
120kg is equivalent to 18 stone 12 pounds in UK measurements. Whether this weight is healthy depends entirely on your height, age, and overall health. At 120kg, some adults will fall within a healthy weight range, whilst others may be classified as overweight or obese according to NHS guidelines. The best way to find out if 120kg is healthy for you is to calculate your personal BMI using your height and weight. Use our free BMI calculator above to check your BMI instantly and see where you fall on the NHS health scale.
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 120kg
At 120kg, whether you're in a healthy weight range depends directly on your height. Here are three concrete examples:
- At 180cm (5ft 11in): BMI = 37 (Obese Class II). Healthy weight range would be 60–80kg.
- At 190cm (6ft 3in): BMI = 33 (Obese Class I). Healthy weight range would be 67–89kg.
- At 200cm (6ft 7in): BMI = 30 (borderline, just into Obese Class I). Healthy weight range would be 74–99kg.
Even for the tallest adults, 120kg is typically above the NHS healthy weight range. The NHS defines a healthy BMI as 18.5–24.9. You can find your exact healthy weight range using the weight converter and BMI calculator on this page — simply enter your height to see your personal targets.
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 What to Do Next
If 120kg is above your healthy weight range: The NHS recommends losing weight gradually at 0.5–1kg per week for sustainable results. This typically requires a calorie deficit of around 500kcal per day alongside increased physical activity. Waist measurement also matters — men should aim for under 94cm (37in); women under 80cm (31.5in). If you're struggling with weight, speak to your GP, who can refer you to NHS weight management services or discuss prescription weight loss options if appropriate. Remember, sustainable weight loss combines dietary changes, physical activity, and behaviour support — there is no single "structured approach".
- 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 stone and pounds?
120kg converts to 18 stone 12 pounds (18st 12lbs) using the standard UK conversion: 1 stone = 6.35kg. You can use our free weight converter above to instantly convert between kg, stone, and pounds.
Is 120kg a healthy weight?
It depends on your height. At 120kg, most adults would have a BMI above 25, which is classified as overweight or obese by NHS standards. Calculate your personal BMI using the BMI calculator on this page to see if 120kg is healthy for your specific height.
What's a healthy weight if I'm 180cm tall and weigh 120kg?
At 180cm (5ft 11in), a healthy weight range is 60–80kg according to NHS guidelines (BMI 18.5–24.9). At 120kg, your BMI would be approximately 37, classified as Obese Class II. Gradual weight loss of 0.5–1kg per week is recommended.
How do I check if my weight is healthy?
Use our free BMI calculator and weight converter above. Enter your height and current weight to see your BMI category and your healthy weight range. Your GP can also provide personalised advice about what a healthy weight means for your individual health profile.
What should I do if 120kg is above my healthy weight range?
Start by speaking to your GP, who can discuss lifestyle changes, refer you to NHS weight management services, or advise on prescription options if appropriate. Sustainable weight loss combines a modest calorie deficit (around 500kcal/day), increased physical activity, and behaviour support. Aim for 0.5–1kg loss per week.
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.