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 BMI is 120kg in Stone?
At 120kg, your BMI depends entirely on your height — the same weight gives very different results for different people. To understand what 120kg means for your health, you need to calculate your personal BMI. Use our free BMI calculator above to enter your exact height and see your result instantly. Below, we've shown 120kg BMI values at six common UK heights, along with the NHS category each falls into. This helps you understand whether 120kg is a healthy weight for you personally.
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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 BMI at Different Heights
When converting kilograms to stone, 120kg equals 18 stone 12.6 lbs. However, BMI is calculated using both weight and height, so the same weight in stone and pounds gives different BMI results depending on how tall you are:
- 5ft 4in (163cm) — BMI 29.8 (Overweight, close to obese)
- 5ft 6in (168cm) — BMI 27.4 (Overweight)
- 5ft 8in (173cm) — BMI 25.4 (Overweight, near healthy range)
- 5ft 10in (178cm) — BMI 23.6 (Healthy weight)
- 6ft 0in (183cm) — BMI 22.0 (Healthy weight)
- 6ft 2in (188cm) — BMI 20.5 (Healthy weight)
As you can see, a metric to imperial weight conversion alone isn't enough — your height determines whether 120kg is a healthy weight for you. The NHS uses both measurements to assess health risk.
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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.
Understanding Your BMI Category
NHS BMI categories for adults are: below 18.5 (underweight), 18.5–24.9 (healthy), 25–29.9 (overweight), 30–34.9 (obese class I), 35–39.9 (obese class II), and 40+ (severely obese). At 120kg, your category depends on your height. If you fall into the overweight or obese range, your GP can advise on whether weight management would reduce your health risks.
Remember that BMI has limitations — it doesn't account for muscle mass or where fat is stored. Waist circumference and overall fitness also matter. Use our weight converter to check 120kg in different units, and speak to your GP for personalised guidance about your individual health.
- 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.
Is 120kg overweight?
At 120kg (18 stone 12.6 lbs), whether you're overweight depends on your height. For someone 5ft 8in, 120kg is overweight (BMI 25.4). For someone 6ft 0in, it's healthy weight (BMI 23.6). Use our BMI calculator above with your height to find out your personal BMI category.
What's 120kg in stone and pounds?
120kg converts to 18 stone and 12.6 pounds (or approximately 18 stone 13 lbs). You can use our free weight converter on this page to switch between kilograms, stone, and pounds instantly.
What's the healthy weight range at 120kg?
If 120kg is overweight for you, the healthy range depends on your height. For someone 5ft 8in tall, healthy weight is roughly 55–74kg (8st 8lbs to 11st 10lbs). For someone 5ft 10in tall, it's approximately 59–79kg (9st 4lbs to 12st 6lbs). Your GP can advise on a target weight for your specific circumstances.
How do I convert kilograms to stone accurately?
Divide kilograms by 6.35 to get stone. For 120kg: 120 ÷ 6.35 = 18.9 stone (18 stone and 12.6 lbs). Our weight converter above does this instantly — just enter 120 and select your units.
Should I lose weight if I'm 120kg?
Whether weight loss would benefit you depends on your height, health conditions, and overall fitness. If your BMI is in the overweight or obese range, your GP may recommend lifestyle changes or weight management support. Even a 5–clinically studied weight loss can improve health outcomes. Book an appointment with your GP for personalised advice. ```
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.