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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100kg Man — Health Context and Weight Management Guide
At 100kg, a man's health profile depends significantly on height, age, and overall fitness. Using our free BMI calculator, you can instantly determine whether 100kg falls into a healthy weight range for your individual measurements. In UK measurements, 100kg is equivalent to 15 stone 10 lbs. According to NHS health information, understanding your BMI and waist circumference helps assess health risk more accurately than weight alone. This guide explains what 100kg means, how it compares to NHS guidance, and what weight management options are available.
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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.
What Does 100kg Mean for Your Health?
At 100kg, your health status depends entirely on your height, age, and body composition. Using the BMI calculator on this page, you can determine your personal BMI instantly. A man who is 5ft 9in (175cm) tall would have a BMI of approximately 31.3 at 100kg, which falls into the obese category (BMI 30–34.9) according to NHS guidelines. However, a man who is 6ft 2in (188cm) would have a BMI of around 25.7, which is within the healthy weight range. The NHS also emphasises that waist circumference matters — a waist measurement above 102cm (40 inches) indicates high cardiovascular risk for men, regardless of BMI. Body composition (muscle vs fat) also affects health risk; an athletic man with significant muscle mass may have a higher BMI but lower health risk than someone with excess body fat at the same weight.
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.
Weight Management Options at 100kg
If you're concerned about your weight at 100kg, several evidence-based approaches are available. The NHS recommends losing weight at a rate of 0.5–1kg per week through a combination of reduced-calorie diet and increased physical activity. Our free weight converter tool can help you track your progress across different measurement units (kg, stone, lbs). For men with a BMI over 30 or 27+ with weight-related health conditions like type 2 diabetes or high blood pressure, prescription weight loss medications may be considered. GLP-1 receptor agonist injections like Wegovy or dual GIP/GLP-1 medications like Mounjaro may help support weight loss, though these require a prescription following a clinical assessment with your GP or a licensed prescriber.
- 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 100kg a healthy weight?
This depends on your height, age, and body composition. Use the BMI calculator above with your height to get your personal BMI. For example, at 100kg and 5ft 9in, BMI is approximately 31 (obese category). At 100kg and 6ft 2in, BMI is around 26 (healthy range). Your GP can advise on what's healthy for you specifically.
How do I convert 100kg to stone?
100kg equals 15 stone 10 lbs (or 15.7 stone). You can use our free weight converter tool on this page to convert between kg, stone, and pounds instantly. This makes it easy to track progress using the measurement system you're most comfortable with.
What weight loss rate is safe at 100kg?
The NHS recommends losing 0.5–1kg per week for sustainable, healthy weight loss. This typically requires a calorie deficit of around 500 kcal per day. Faster weight loss is possible with medical support but increases the risk of muscle loss. Our free progress tracker can help you monitor your weight loss journey.
Can I use weight loss injections at 100kg?
Prescription weight loss medications like Wegovy (semaglutide) or Mounjaro (tirzepatide) may be suitable if your BMI is 30 or above, or 27+ with weight-related health conditions. However, these are prescription-only and require a clinical assessment. Your GP can refer you to NHS specialist services, or you can seek a private clinical assessment from a licensed prescriber.
What's my healthy weight range if I'm a man at 100kg?
For a man 5ft 9in tall, healthy weight is approximately 60–75kg (9st 6lbs to 11st 11lbs). At 5ft 10in, healthy weight is around 62–78kg. Use the BMI calculator above to find your personal healthy weight range based on your exact height. NHS guidance states a healthy BMI is 18.5–24.9 for most adults.
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.