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 99kg in Stone and Pounds?
99 kilograms equals 15 stone and 8.4 pounds (or 15st 8lbs) using the standard UK conversion. However, your BMI and health category depend on your height, not just your weight. At the average UK adult height, a weight of 99kg falls into the obese range according to NHS guidelines. Use our free BMI calculator to find your personal BMI instantly, or see what this weight means at different heights below.
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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.
99kg BMI at Different Heights
99kg in stone and pounds is 15st 8lbs, but your BMI varies significantly depending on your height. Here's what 99kg gives you at common UK heights:
- 5ft 3in (160cm): BMI 31.2 — Obese (Class I)
- 5ft 6in (168cm): BMI 29.0 — Overweight
- 5ft 9in (175cm): BMI 27.0 — Overweight
- 5ft 11in (180cm): BMI 25.2 — Healthy weight
- 6ft 1in (185cm): BMI 23.5 — Healthy weight
At heights below 5ft 10in, 99kg typically falls into the overweight or obese category. Calculate your personal BMI using the free calculator on this page to see exactly where you stand against NHS guidelines.
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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 BMI Categories and Limitations
According to NHS guidance, a BMI of 25 to 29.9 is classed as overweight, and 30 or above is obese. At 99kg, whether you fall into either category depends entirely on your height. BMI is a useful screening tool but has important limitations — it doesn't distinguish between muscle and fat, so athletes or very muscular individuals may have a high BMI despite low body fat. BMI also doesn't account for where fat is stored (waist circumference matters too) or vary by age. Your GP can provide personalised advice about what your BMI and weight mean for your individual health.
- 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 99kg in stone and pounds exactly?
99kg equals 15 stone and 8.4 pounds (15st 8lbs). To convert kilograms to stone, divide the weight by 6.35029. For quick conversions between kg, stone, and lbs, use the free weight converter on this page.
Is 99kg overweight or obese?
It depends on your height. At shorter heights (below 5ft 6in), 99kg typically falls into the obese range. At average to taller heights, it may be overweight or even healthy weight. Use our BMI calculator to check your exact category based on your personal height.
What BMI does 99kg give at 5ft 9in?
At 5ft 9in (175cm), a weight of 99kg gives a BMI of approximately 27.0, which falls into the overweight category according to NHS guidelines (BMI 25.0–29.9).
Can I rely on BMI alone to assess my health?
BMI is a helpful starting point but has limitations. It doesn't show the difference between muscle and fat, and doesn't account for waist circumference or where fat is stored. The NHS recommends also measuring waist circumference — over 94cm in men or 80cm in women indicates increased health risk.
How do I know if 99kg is a healthy weight for me?
Calculate your BMI using your personal height with our free BMI calculator on this page, then discuss the result with your GP. They can advise whether your weight is healthy given your age, muscle mass, medical history, and individual circumstances.
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.