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 — Exact Conversion & Health Context
120kg is equal to 18 stone and 12.8 pounds (or approximately 18 stone 13 lbs in everyday terms). If you're checking your weight in UK measurements or need to understand your health status at this weight, use our free weight converter above to switch between kg, stone, and pounds instantly. This guide also provides BMI context and healthy weight information based on NHS guidelines.
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.
120kg to Stone Conversion & Nearby Values
To convert kilograms to stone, divide the kg value by 6.35029. 120kg ÷ 6.35029 = 18.90 stone, which is 18 stone and 12.8 lbs. Here's a conversion table showing 120kg alongside nearby values to help you find similar weights:
- 110kg = 17st 4.1lbs
- 115kg = 18st 2lbs
- 120kg = 18st 12.8lbs
- 125kg = 19st 8.6lbs
- 130kg = 20st 6.4lbs
The formula works in reverse too: to convert stone and pounds to kg, multiply stone by 6.35029 and pounds by 0.453592, then add the results. This stone to kg conversion is the standard used by NHS health professionals and UK health services across the country.
Clinically BackedWeight Loss
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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.
Health Context: BMI & Weight Assessment at 120kg
At 120kg, your BMI depends on your height. For example, at an average UK male height of 5ft 9in (175cm), 120kg gives a BMI of approximately 39.2, which falls in the obese (Class II) category according to NHS guidelines. A healthy BMI is 18.5–24.9, which means a healthy weight at 5ft 9in would be approximately 55–74kg (8st 9lbs to 11st 9lbs). Calculate your personal BMI using our free BMI calculator on this page to see where you stand. Even modest weight loss of 5–10% can improve health markers like blood pressure and blood sugar control.
- 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 120kg to stone and pounds?
Divide 120 by 6.35029 to get 18.90 stone. The decimal (0.90) converts to pounds by multiplying by 14: 0.90 × 14 = 12.6 lbs. So 120kg = 18 stone 12.6 lbs (or approximately 18 stone 13 lbs).
What is a healthy weight range for an adult UK male at 5ft 9in?
At 5ft 9in (175cm), a healthy BMI range of 18.5–24.9 means a healthy weight of approximately 55–74kg (8st 9lbs to 11st 9lbs). Use our free BMI calculator above to check your personal healthy weight range based on your actual height.
Is 120kg considered overweight or obese?
At 120kg, BMI classification depends on height. For most UK adults, 120kg typically falls in the obese category (BMI ≥30). Your GP can assess your individual health based on weight, waist circumference, and other health markers. Weight loss support is available through NHS services.
How much weight loss would improve my health at 120kg?
NHS evidence shows that losing even 5–10% of body weight can reduce blood pressure, improve blood sugar control, and lower cardiovascular risk. From 120kg, a 5–10% loss means losing 6–12kg (approximately 1–2 stone). Sustainable loss is approximately 0.5–1kg per week with dietary changes and activity increases.
Can I use the weight converter to check other weights?
Yes. Our free weight converter at the top of this page lets you convert any weight between kg, stone, and pounds instantly. It's useful for checking your weight trends, understanding NHS health guidelines, or converting weights mentioned in health articles or medical records.
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.