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
Is 103 Kilos a Healthy Weight?
103 kilograms converts to 16 stone and 3.2 pounds using the standard kilogram to stone conversion. Whether this weight is healthy depends entirely on your height and body composition. At different heights, 103kg can fall anywhere from overweight to obese according to NHS guidelines. Use our free BMI calculator above to check your personal BMI instantly — it takes just seconds and shows exactly where your weight sits on the health scale.
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.
Healthy Weight Ranges at Different Heights
To determine if 103kg is healthy for you, your height is the key factor. The healthy weight range varies significantly — for example, at 5ft 4in (163cm) a weight of 103kg gives a BMI of 38.6, which falls into the obese category. However, at 5ft 10in (178cm), the same weight produces a BMI of 29.5, in the overweight range. At 6ft 2in (188cm), 103kg results in a BMI of 26.4, which is within the healthy range.
- 5ft 4in (163cm): Healthy range is 48–63kg; 103kg is above this
- 5ft 10in (178cm): Healthy range is 59–79kg; 103kg is above this
- 6ft 2in (188cm): Healthy range is 68–91kg; 103kg is slightly above this
Our weight converter lets you calculate your healthy weight range instantly — simply enter your height and see the NHS-aligned recommendations for your frame.
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.
NHS Guidance and What to Do Next
If 103kg is above the healthy range for your height, the NHS recommends consulting your GP, especially if you have weight-related health conditions such as type 2 diabetes, high blood pressure, or sleep apnoea. A waist measurement is equally important — men should aim for under 94cm (37in) and women under 80cm (31.5in) for good health. Sustainable weight loss happens at approximately 0.5–1kg per week. Your GP can discuss tailored options including lifestyle changes, dietary support, or — if appropriate — referral to specialist weight management services.
- 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 103kg in stone and pounds exactly?
103kg converts to 16 stone and 3.2 pounds (or approximately 16st 3lbs). You can verify this using our free weight converter above, which also converts to kilograms, stone, and pounds in both directions.
Is a BMI of 30 or above automatically unhealthy?
A BMI of 30+ falls into the NHS obese category and is associated with increased health risks. However, BMI has limitations — it doesn't account for muscle mass or where fat is stored. Your GP can give personalised health advice based on your overall health profile, not just BMI alone.
What's the healthy weight for someone 5ft 8in tall?
At 5ft 8in (173cm), the NHS healthy weight range is approximately 55–74kg (8st 9lbs to 11st 9lbs). Our BMI calculator shows your healthy range instantly for your exact height and age.
How much weight would I need to lose to reach a healthy BMI?
It depends on your height. Use our free BMI calculator to enter your current weight and height, and it will show your target healthy weight range. The difference is how much weight loss would move you into the healthy category.
Can I lose weight safely at home, or do I need medical support?
Many people lose weight successfully through dietary changes and increased activity. However, if you have underlying health conditions, take medications, or want to lose more than 10kg, speak to your GP first. The NHS also offers free weight loss support programmes and tier 3 specialist services in some areas.
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.