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 120kg in Stones?
120kg is equal to 18 stone and 12.8 pounds (often rounded to 18 stone 13 lbs). To convert kilograms to stone, divide the kg value by 6.35029. This weight falls into the obese category according to NHS guidelines for most UK adults, though individual health context depends on height, age, and overall fitness. Use our free weight converter above to check conversions between metric and imperial weight units instantly, or continue reading for BMI context and healthy weight guidance at this specific weight.
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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.
120kg Weight Conversion Table — Nearby Values
Here's a conversion table showing 120kg alongside nearby weights in both stone and pounds, to help you see where this weight sits in the kg to stone conversion scale:
- 110kg = 17 stone 4.0lbs
- 115kg = 18 stone 1.9lbs
- 120kg = 18 stone 12.8lbs
- 125kg = 19 stone 9.6lbs
- 130kg = 20 stone 6.5lbs
The conversion formula is straightforward: divide kilograms by 6.35029 to get stone, or multiply by 2.20462 to get pounds. For example, 120 ÷ 6.35029 = 18.91 stone, which breaks down as 18 stone and 0.91 × 14 = 12.8 pounds. This metric to imperial weight conversion is useful for understanding UK health guidance and weight management contexts.
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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.
BMI Context — Is 120kg Healthy at My Height?
At 120kg, your BMI depends entirely on your height. For example, at an average UK male height of 175cm (5ft 9in), 120kg gives a BMI of 39.2, which falls into the obese (Class III) category. At 165cm (5ft 5in), the BMI would be 43.9. However, at 190cm (6ft 3in), the BMI would be 33.2 — still obese but lower. Use our free BMI calculator above to find your personal BMI instantly and see where you fall on the NHS healthy weight scale. Even at this weight, modest weight loss of 5–10% can bring significant health benefits including improved blood pressure, better blood sugar control, and reduced joint strain.
- 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 the exact stone and pound conversion for 120kg?
120kg equals 18 stone and 12.8 pounds. To convert, divide 120 by 6.35029 to get 18.91 stone. Multiply the decimal (0.91) by 14 to get pounds: 0.91 × 14 = 12.8lbs. Many people round this to 18 stone 13 pounds for everyday use.
Is 120kg considered overweight or obese in the UK?
At 120kg, your category depends on height. According to NHS guidelines, if you're around average UK height (175cm for men, 162cm for women), 120kg falls into the obese category. Your GP can advise on what this means for your individual health, especially if you have weight-related conditions like type 2 diabetes or high blood pressure.
What is a healthy weight if I'm currently 120kg?
Healthy weight ranges from a BMI of 18.5–24.9. At 175cm height, healthy weight is roughly 55–76kg. At 165cm, it's 50–68kg. However, even losing 5–10% of your current weight (6–12kg) can significantly improve health markers. Your GP or a registered dietitian can help create a sustainable plan tailored to your circumstances.
Can I use online tools to track weight loss from 120kg?
Yes. Our free progress tracker on this site lets you log weight changes over time and see your progress visually. Combined with our BMI calculator and GLP-1 weight loss calculator, you can monitor your journey and estimate realistic outcomes if considering weight loss medication or lifestyle changes.
How quickly can I lose weight from 120kg?
The NHS recommends losing 0.5–1kg per week for sustainable results. This requires a calorie deficit of roughly 500kcal daily. At this pace, losing 10kg would take 10–20 weeks. If considering prescription weight loss support, a GP or specialist can assess your eligibility and provide personalised guidance on safe, realistic targets.
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.