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 103kg in Stone?
103 kilograms is equal to 16 stone and 3 pounds (16st 3lbs). If you're tracking your weight using UK measurements, understanding how to convert between kilograms and stone is straightforward — simply divide kilograms by 6.35 to get the stone equivalent. This conversion is useful whether you're monitoring your health, following NHS guidance, or using UK health information resources. Our free weight converter above lets you switch between metric and imperial measurements instantly.
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.
Where Does 103kg Fall in UK Health Guidance?
At 103kg (16st 3lbs), your health context depends on your height and age. Using our free BMI calculator above, you can determine your personal BMI, which the NHS uses as a key screening tool for healthy weight. According to NHS guidelines, a healthy BMI for most UK adults falls between 18.5 and 24.9. For adults of South Asian, Chinese, Black African, or Black Caribbean heritage, the NHS recommends lower thresholds (18.5 to 22.9) due to higher health risks at lower BMI levels. If your BMI falls above 25, your GP may discuss weight management strategies or refer you to specialist services. Weight is influenced by muscle mass, bone density, genetics, and overall health — BMI is a useful screening tool but does not account for these variations.
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.
Taking Action: NHS Support and Health Resources
If you're concerned about your weight, your GP is the best starting point for personalised guidance. The NHS offers several support options: Tier 1 includes self-help tools and community programmes; Tier 2 provides primary care-based support like the NHS Weight Loss Plan; Tier 3 offers specialist multidisciplinary weight management services; and Tier 4 includes bariatric surgery for severe obesity with significant health complications. Even a 5% weight reduction can bring meaningful health benefits including lower blood pressure and improved blood sugar control. Track your progress with our free progress tracker, and always consult your GP before starting any new weight management programme.
- 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 103kg to stone accurately?
Divide 103 by 6.35029 to get 16.23 stone, which equals 16 stone and 3 pounds (16st 3lbs). Our free weight converter above handles this instantly and lets you switch between kg, stone, and pounds in seconds.
What BMI would 103kg give me?
Your BMI depends on your height. Use our free BMI calculator at the top of this page to enter your height and see your personal BMI, plus where it falls within NHS healthy weight ranges.
Is 103kg considered overweight or obese according to NHS guidelines?
This depends entirely on your height. If you're 5ft 8in (173cm), a weight of 103kg gives a BMI of approximately 34.5 (obese). If you're 6ft 2in (188cm), it's approximately 26.4 (overweight). Your GP can give you personalised health advice based on your individual measurements.
What are the health risks associated with excess weight?
Carrying excess weight increases risk of type 2 diabetes, cardiovascular disease, high blood pressure, certain cancers, sleep apnoea, and joint problems. However, even modest weight loss of 5–10% can significantly reduce these risks and improve overall health outcomes.
How can I access weight management support through the NHS?
Start by speaking with your GP, who can assess your health and refer you to appropriate support. The NHS offers tier 1 self-help tools, tier 2 primary care programmes, and tier 3 specialist weight management services depending on your needs and local availability.
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.