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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120 kg in Stones and Lbs — Quick Conversion
120 kilograms is equal to 18 stone and 12.8 pounds (or approximately 18 stone 13 lbs). If you're converting kilos in stone for health tracking, weight management, or general reference, this guide explains the conversion formula and provides context for what this weight means at different heights. Use our free weight converter above to switch between kg, stone, and lbs instantly whenever you need it.
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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.
How to Convert 120 kg to Stone and Pounds
To convert 120 kg to stone, divide by 6.35029 (the exact conversion factor). This gives you 18.91 stones. To break this into stones and pounds, multiply the decimal by 14 (since 1 stone = 14 pounds exactly): 0.91 × 14 = 12.74 lbs. So 120 kg = 18 stone 12.8 lbs.
Quick formula: kg ÷ 6.35029 = stone | or | kg × 2.20462 = total pounds (120 kg = 264.6 lbs)
This metric to imperial weight conversion is straightforward once you know the conversion factors. You can also use our free weight converter on this page to calculate the exact conversion instantly. Below is a reference table showing 120 kg alongside nearby weights for easy comparison.
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 at Different Heights — BMI Context
At 120 kg, your BMI depends on your height. For example: at 5ft 8in (173 cm), a weight of 120 kg gives a BMI of 40.2 (severely obese by NHS standards). At 5ft 10in (178 cm), the BMI is 38.4. At 6ft (183 cm), it's 35.8. Use our free BMI calculator above to find your personal BMI and see where you fall on the NHS healthy weight scale. If your BMI is above 30, your GP can discuss weight management options, including lifestyle changes or, where appropriate, prescription support.
A healthy weight range at these heights would be 59–79 kg (9st 4lbs to 12st 6lbs). Even a modest weight loss of 5–10% can improve blood pressure, blood sugar control, and joint health. If you're tracking a weight loss journey, our free progress tracker can help you log your weight weekly and see trends 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.
Is 120 kg overweight?
Yes, 120 kg is in the obese category (BMI 30+) for most UK adults. At an average height of 5ft 8in, 120 kg gives a BMI of 40.2. The NHS healthy weight range at this height is 59–79 kg. Your GP can offer personalised guidance on whether weight management support is right for you.
What is the exact stone and pounds equivalent of 120 kg?
120 kg equals exactly 18 stone and 12.8 pounds (often written as 18 st 12.8 lbs or rounded to 18 st 13 lbs). You can verify this using our weight converter on this page for instant conversions.
How do I convert kg to stone manually?
Divide kilograms by 6.35029 to get stone. For 120 kg: 120 ÷ 6.35029 = 18.91 stone. To convert the decimal into pounds, multiply by 14. In this case: 0.91 × 14 = 12.8 lbs. So 120 kg = 18 stone 12.8 lbs.
What's a healthy weight in stone for my height?
A healthy BMI (18.5–24.9) at 5ft 8in is 59–79 kg (9st 4lbs to 12st 6lbs). At 5ft 10in, it's 62–84 kg (9st 10lbs to 13st 3lbs). Use our BMI calculator above to find your personal healthy weight range based on your exact height.
How can I lose weight safely from 120 kg?
The NHS recommends losing 0.5–1 kg per week through a calorie deficit and increased physical activity. Your GP can discuss options including behaviour change support, dietary guidance, or—if eligible—prescription weight loss medication. Our progress tracker helps you monitor weekly changes.
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.