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
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What is 120 kg in stone and pounds?
120 kilograms is equal to 18 stone and 12.8 pounds (or 18st 12lbs rounded). To convert kilograms to stone, you divide the kilogram value by 6.35029. This weight falls into the obese category according to NHS guidelines for most UK adults, though context depends on your height, age, and overall health. Use our free BMI calculator above to check your personal BMI and understand where your weight sits on the NHS health spectrum. Whether you're tracking your current weight or planning a health journey, understanding your measurements in familiar UK units makes it easier to set realistic health goals.
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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.
120 kg conversion table and formula
Here's a handy conversion table showing 120kg alongside nearby values in both stone and pounds:
- 115 kg = 18st 2.4lbs (253.5 lbs)
- 116 kg = 18st 3.5lbs (255.7 lbs)
- 117 kg = 18st 5.1lbs (257.9 lbs)
- 118 kg = 18st 6.6lbs (260.1 lbs)
- 120 kg = 18st 12.8lbs (264.6 lbs)
- 121 kg = 18st 13.9lbs (266.8 lbs)
- 122 kg = 19st 1.5lbs (269.0 lbs)
- 123 kg = 19st 3.0lbs (271.2 lbs)
- 124 kg = 19st 4.6lbs (273.4 lbs)
To convert any kilogram value to stone, divide by 6.35029. To convert to pounds, multiply kilograms by 2.20462. Our free weight converter tool above lets you switch between kg, stone, and pounds instantly for any value.
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.
120 kg BMI and healthy weight context
At 120kg, your BMI depends on your height. For example, at an average UK adult height of 1.70m (5ft 7in), a weight of 120kg gives a BMI of approximately 41.4, which falls into the severely obese category according to NHS guidelines. At 1.80m (5ft 11in), the BMI would be around 37, still in the obese range. The NHS healthy weight range at these heights would be roughly 53–71kg and 60–80kg respectively. If you're concerned about your weight and health, your GP can provide personalised advice. Even modest weight loss of 5–10% can bring meaningful 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.
How do I convert 120 kg to stone myself?
Divide 120 by 6.35029. This gives 18.89 stone. To convert the decimal to pounds, multiply 0.89 by 14 (since there are 14 pounds in one stone), which gives approximately 12.5 pounds. So 120kg = 18st 12.5lbs. Our free weight converter above does this instantly.
Is 120 kg considered overweight?
At 120kg, you're in the obese category according to NHS guidelines for most UK adults, though this depends on your height. Use the free BMI calculator on this page to check your personal BMI. BMI is a useful screening tool, but remember it doesn't account for muscle mass or where fat is stored on your body.
What is the healthy weight range for someone currently at 120 kg?
This depends on your height and ethnicity. For an average UK adult at 1.70m, the healthy weight range is approximately 53–71kg. Your GP or a healthcare professional can discuss what a healthy weight range looks like for you personally, taking into account your overall health and lifestyle.
How many pounds is 120 kg?
120 kilograms equals approximately 264.6 pounds. To convert kg to pounds, multiply the kilogram value by 2.20462. For quick conversions between all UK weight units (kg, stone, and pounds), use the weight converter tool on this page.
Can I use BMI alone to assess my health at 120 kg?
BMI is a useful starting point, but it has limitations — it doesn't distinguish between muscle and fat, and doesn't account for where fat is stored. Waist circumference is also important: the NHS recommends men keep waist below 94cm and women below 80cm to reduce health risks. Your GP can give you comprehensive health advice beyond BMI.
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.