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 120 Kg in Stone?
120 kilograms is equal to 18 stone and 12.8 pounds in UK measurements. If you're converting your weight for UK health guidance, understanding how your weight translates to stone is useful for fitness tracking, NHS health advice, and personal health goals. Our free weight converter lets you switch between kg, stone, and pounds instantly, while our BMI calculator shows how your weight relates to health thresholds according to NHS guidance.
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.
120 Kg Conversion & Health Context
To convert 120kg to stone, divide by 6.35029, which gives 18 stone and 12.8 pounds. Many UK adults prefer stone and pounds for body weight, even though the NHS uses kilograms for clinical measurements. For someone weighing 120kg, the health context depends on height. For example, at 1.75m (5ft 9in), a weight of 120kg gives a BMI of approximately 39.2, which falls in the severely obese category according to NHS guidelines. At 1.85m (6ft 1in), the same weight produces a BMI of around 35.1, still in the obese range. Use our free BMI calculator above to find your personal BMI instantly and see how it compares to NHS healthy weight thresholds. BMI has limitations—it doesn't account for muscle mass—but it's a useful screening tool for health risk assessment.
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.
Weight Management & NHS Guidance
If you weigh 120kg and are concerned about your health, the NHS recommends speaking with your GP about weight management options. A healthy weight range varies by height, but losing even 5–10% of your current weight can bring meaningful health benefits including better blood pressure, improved blood sugar control, and reduced joint strain. Weight loss is most sustainable at around 0.5–1kg per week alongside a reduced-calorie diet and increased physical activity. For adults with a BMI above 35, or 30 with weight-related health conditions such as type 2 diabetes or high blood pressure, prescription weight management medications may be an option following clinical assessment. Track your progress with our free progress tracker to monitor changes over time.
- 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?
120 kilograms equals 18 stone and 12.8 pounds (often written as 18st 12.8lbs). To convert, divide kilograms by 6.35029. This UK measurement is commonly used for body weight tracking in the UK, even though NHS clinical records typically use kilograms.
What BMI is 120kg?
Your BMI at 120kg depends on your height. At 5ft 9in (175cm), BMI is approximately 39.2. At 6ft (183cm), it's approximately 35.9. Use our BMI calculator above to calculate your exact BMI—it takes just seconds and shows your category according to NHS guidelines.
Is 120kg overweight?
At 120kg, your health status depends entirely on your height. Most adults at this weight fall in the overweight or obese BMI categories, but this is a clinical classification, not a judgment. Speaking with your GP can help you understand your personal health risks and whether weight management support would benefit you.
Can I lose weight with prescription medication at 120kg?
If you weigh 120kg with a BMI over 30 (or over 27.5 with weight-related health conditions), you may be eligible for prescription weight loss treatment following clinical assessment. These medications work alongside diet and exercise. Your GP or a licensed prescriber can assess whether this is suitable for your individual circumstances.
How much weight should I aim to lose from 120kg?
Aiming to lose 5–10% of your body weight (6–12kg from 120kg) is a realistic, evidence-based target that can significantly improve health outcomes. The NHS recommends losing 0.5–1kg per week as a sustainable rate. A GP or weight management specialist can help you set personal goals matched to your health priorities.
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.