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 stones and pounds?
120 kg is equal to 18 stone and 12.8 pounds (often written as 18st 12.8lbs). If you're converting kilos to stone for health or personal reasons, understanding how to convert kilograms to stone is essential in the UK, where both metric and imperial measurements are commonly used. At this weight, your health context depends on your height — use our free BMI calculator above to find your personal BMI instantly and understand where you sit on the NHS healthy weight scale.
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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 to Stone — Quick Conversion Reference
To convert 120 kg to stone and pounds, we use the standard kg to stone conversion formula: divide the kilogram value by 6.35029 to get stone, then multiply any decimal remainder by 14 to get pounds. For 120 kg: (120 ÷ 6.35029 = 18.91 stone). The decimal 0.91 × 14 = 12.8 pounds, giving us 18 stone 12.8 lbs. This metric to imperial weight conversion is straightforward once you know the exact conversion factor. Below is a handy reference table showing how 120 kg compares to nearby weight values in stone and pounds — useful if you're tracking weight changes or converting for health records.
- 115 kg = 18st 2.4lbs
- 117 kg = 18st 5.6lbs
- 120 kg = 18st 12.8lbs
- 123 kg = 19st 6lbs
- 125 kg = 19st 9.2lbs
Use our free weight converter on this page to convert between kg, stone, and pounds instantly for any weight value.
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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 Health Context — BMI and Healthy Weight
Whether 120 kg is a healthy weight depends entirely on your height. At an average UK adult height of 173 cm (5ft 8in), a weight of 120 kg gives a BMI of approximately 40.1 — classified as severely obese (Class III) by NHS guidelines. However, at 190 cm (6ft 3in), the same weight produces a BMI of around 33.2, falling into the obese category. The NHS recommends a healthy BMI range of 18.5–24.9 for most adults, though lower thresholds apply for South Asian, Chinese, Black African, and Caribbean heritage adults. Calculate your personal BMI using our free BMI calculator above to understand your individual health context, then speak to your GP if you'd like personalised guidance on weight management.
- 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 and pounds myself?
Divide 120 by 6.35029 to get 18.91 stone. Take the decimal (0.91) and multiply by 14 to get pounds (12.8). So 120 kg = 18 stone 12.8 pounds. Use our weight converter above for instant conversions at any weight.
Is 120 kg a healthy weight?
It depends on your height. At average UK heights, 120 kg typically falls into the obese range (BMI 30+). Use our free BMI calculator to find your personal BMI and check where you stand on the NHS healthy weight scale.
What's the difference between stone, pounds, and kilograms?
Kilograms (kg) are metric units used worldwide. Stone and pounds are imperial measurements common in the UK. One stone equals exactly 14 pounds, and one kilogram equals 0.157 stone. The UK uses both systems, so knowing how to convert between them is helpful.
Can I use the same conversion formula for any weight in kg?
Yes. To convert any weight from kg to stone, divide by 6.35029. To convert stone to kg, multiply by 6.35029. This formula works for all weights — use our converter tool for quick calculations.
What's the NHS healthy weight range for someone 180 cm tall?
For someone 180 cm (5ft 11in) tall, the healthy BMI range is 18.5–24.9, which equals approximately 60–80 kg (9st 6lbs to 12st 8lbs). Calculate your personal healthy weight range using our BMI calculator.
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.