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 Stones? BMI & Health Context
99kg converts to 15 stone 8.2 pounds, but your BMI (and what this weight means for your health) depends on your height. Using the NHS BMI calculator above, you can enter your exact height to find out where your weight falls on the NHS health scale. This page shows what BMI 99kg gives at different heights, plus your healthy weight range. Whether you're tracking weight loss progress or understanding your current health metrics, we've included everything you need to know in UK measurements.
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.
What BMI Does 99kg Give at Different Heights?
Your BMI at 99kg varies significantly depending on your height. Here are examples using the standard BMI formula (weight in kg ÷ height in metres squared):
- 5ft 4in (163cm): BMI of 35.1 — Obese (Class II) on NHS scale
- 5ft 6in (168cm): BMI of 33.2 — Obese (Class II)
- 5ft 8in (173cm): BMI of 31.0 — Obese (Class I)
- 5ft 10in (178cm): BMI of 29.4 — Overweight on NHS scale
- 6ft 0in (183cm): BMI of 27.8 — Overweight
- 6ft 2in (188cm): BMI of 26.4 — Overweight
At 99kg, most adults fall into the overweight or obese category. Use our free BMI calculator above to find your exact BMI with your specific height, then check the NHS categories below to understand what this means for your health.
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 Weight Categories & What Your BMI Means
The NHS uses standardised BMI ranges to assess weight-related health risk. A healthy BMI is between 18.5 and 24.9. At 99kg, you're above this range unless you're very tall (over 6ft 2in). However, BMI has limitations — it doesn't account for muscle mass or where fat is stored around your body. Your GP can also assess your waist circumference and other health markers. If you're concerned about your weight or health, speak to your GP, who can discuss your individual situation and any support available to you, including lifestyle changes or weight management options.
- 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 99kg to stone accurately?
Divide 99 by 6.35029 to get stone. 99kg = 15 stone 8.2 pounds. You can use our free weight converter above to switch between kg, stone, and pounds instantly for this weight or any other.
Is 99kg considered overweight or obese?
It depends on your height. At 99kg, most adults fall into the overweight or obese NHS category. Use the BMI calculator above with your height to find your exact category. Generally, the taller you are, the more likely 99kg falls into overweight rather than obese.
What is a healthy weight at my height if I weigh 99kg?
Your healthy weight range depends on your height. At 5ft 8in (173cm), a healthy weight is roughly 55–74kg. At 6ft (183cm), it's approximately 60–81kg. Use our free BMI calculator above to see your personal healthy weight range based on your exact height.
Does BMI tell the whole story about my weight and health?
No. BMI is a useful screening tool but has real limitations. It doesn't distinguish between muscle and fat, doesn't account for where fat is stored, and may not be accurate for very muscular people, older adults, or during pregnancy. Your GP can assess your overall health picture, including waist circumference and other factors.
What should I do if I'm concerned about my weight at 99kg?
Start by speaking to your GP, who can assess your individual health and discuss any support available. You might track progress with our free progress tracker, use the BMI calculator regularly to monitor changes, and explore NHS weight management resources or lifestyle support available in your area.
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.