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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109 Kg To Stones And Pounds — Healthy Weight Guide
109 kg converts to 17 stone 2 pounds (17st 2lbs). Whether this weight is healthy depends entirely on your height, age, and individual circumstances. Using our free BMI calculator above, you can discover your personal BMI and see where you fall on the NHS health scale. This guide explains what 109 kg means in UK measurements, shows you healthy weight ranges for different heights, and provides clear NHS guidance on what to do next.
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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.
Healthy Weight Ranges For Common Heights
To convert kilograms to stone accurately, divide by 6.35029 — so 109 kg ÷ 6.35029 = 17.17 stone (approximately 17st 2lbs). However, whether 109 kg is healthy for you depends on your height. The NHS uses BMI to assess this, calculated as weight (kg) divided by height (m) squared. Here are three examples showing how the same weight can be healthy or overweight depending on height:
- At 1.65m (5ft 5in): 109 kg gives a BMI of 40.0 — classified as obese (Class III)
- At 1.75m (5ft 9in): 109 kg gives a BMI of 35.6 — classified as obese (Class II)
- At 1.88m (6ft 2in): 109 kg gives a BMI of 30.8 — classified as obese (Class I)
A healthy BMI range is 18.5 to 24.9 according to NHS guidelines. To find your healthy weight range for your specific height, use the weight converter on this page to check different weights, or try our free BMI calculator to see your exact position.
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.
NHS Guidance And Next Steps
If 109 kg gives you a BMI above 25, the NHS recommends discussing your weight with your GP. They can assess your individual health, measure your waist circumference (important for health risk, separate from BMI), and discuss whether lifestyle changes or support would be helpful. Waist measurement matters: men with waist over 102cm and women over 88cm face increased health risks even at moderate BMI. Weight is influenced by many factors — genetics, medical conditions, medications, and lifestyle all play a role. A non-judgmental GP conversation is a good first step. If you're motivated to make changes, even a 5–clinically studied weight loss can significantly improve health outcomes.
- 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 109 kg in stones and pounds?
109 kg equals 17 stone and 2 pounds (17st 2lbs). To convert any kilogram to stone, divide by 6.35029. You can use our free weight converter above to switch between kg, stone, and lbs instantly for any weight.
Is 109 kg overweight?
It depends on your height. At 109 kg, someone 1.65m tall would have a BMI of 40 (obese), while someone 1.88m tall would have a BMI of 31 (obese Class I). Use our free BMI calculator above with your actual height to find out your personal BMI.
What is the healthy weight range for my height?
A healthy BMI is 18.5 to 24.9 according to NHS guidelines. To find your healthy weight range, calculate the upper and lower bounds: healthy weight range = 18.5 × height(m)² to 24.9 × height(m)². Or use our free BMI calculator to check instantly.
What should I do if I'm above a healthy weight?
The NHS recommends discussing your weight with your GP. They can assess your individual health, check your waist circumference, and discuss whether lifestyle support, structured programmes, or other interventions might help. Even 5–clinically studied weight loss can improve health significantly.
Does stone to kg conversion work the same way?
Yes, it's the reverse calculation. To convert stone to kg, multiply by 6.35029. For example, 17 stone × 6.35029 = 108 kg (approximately). Our free weight converter handles all conversions between kg, stone, and pounds instantly.
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.