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 99 Kg in Stone and Pounds?
99 kilograms is equal to 15 stone and 8.6 pounds (or approximately 15 stone 9 lbs in everyday UK terms). However, whether this weight is healthy for you depends entirely on your height. Using the standard kg to stone conversion formula, the same weight produces very different BMI results across different heights. Your BMI determines which NHS health category you fall into. Use our free BMI calculator above to find your exact BMI, or read on for example BMI values at common UK heights.
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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 99 Kg Give at Different Heights?
BMI depends on both weight and height. At 99 kg, here's what BMI you'd have at common heights, and which NHS category that falls into:
- 160 cm (5ft 3in): BMI 38.7 — Obese (Class II)
- 165 cm (5ft 5in): BMI 36.3 — Obese (Class II)
- 170 cm (5ft 7in): BMI 34.3 — Obese (Class I)
- 175 cm (5ft 9in): BMI 32.3 — Obese (Class I)
- 180 cm (5ft 11in): BMI 30.5 — Obese (Class I)
- 185 cm (6ft 1in): BMI 28.9 — Overweight
As you can see, at 99 kg, the same weight gives obese-range BMI at shorter heights but falls into the overweight category at taller heights. This shows why BMI must always be assessed alongside height. Calculate your personal BMI instantly using the free weight loss calculator on this page — it accounts for your exact measurements.
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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.
Understanding NHS BMI Categories and Limitations
The NHS BMI categories are: Underweight (below 18.5), Healthy Weight (18.5–24.9), Overweight (25.0–29.9), Obese Class I (30.0–34.9), Obese Class II (35.0–39.9), and Severely Obese (40.0+). At 99 kg, most adults fall into the Obese range depending on height.
However, BMI has important limitations: it cannot distinguish between muscle and fat, so athletic individuals may have high BMI but low body fat. BMI also doesn't account for where fat is stored — waist circumference matters for health risk. For a complete picture of your health, discuss your weight, BMI, and waist measurement with your GP, who can give personalised advice based on your individual health profile and any weight-related conditions you may have.
- 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 99 kg converted to stone and pounds?
99 kg equals 15 stone 8.6 pounds, or approximately 15 stone 9 lbs in everyday UK measurements. To convert kilograms to stone, divide the kg value by 6.35029. Our free weight converter on this page lets you convert between kg, stone, and pounds instantly without a UK pharmacy calculation.
Is 99 kg overweight or obese?
At 99 kg, whether you're overweight or obese depends on your height. Shorter adults (under 170 cm) typically fall into the Obese range, while taller adults (over 180 cm) may be in the Overweight category. Your GP can assess your individual health status based on your BMI, waist circumference, and any weight-related health conditions.
What is the healthy weight range for someone 175 cm tall?
For someone 175 cm tall, the NHS healthy weight range is approximately 56 kg to 76 kg (8 stone 12 lbs to 12 stone). At 99 kg, this would give a BMI of 32.3, which falls into the Obese Class I category. Our BMI calculator above shows the exact healthy weight range for your specific height.
Can BMI be inaccurate?
Yes. BMI doesn't distinguish between muscle and fat, so athletes may have high BMI but low body fat. It also doesn't account for age, bone density, or where fat is stored. Waist circumference is also important for assessing health risk. Always discuss your BMI results with your GP for personalised health guidance, especially if you have weight-related health conditions.
How can I estimate weight loss with medication?
If you're considering GLP-1 weight loss medication (such as Mounjaro or Wegovy), our free GLP-1 weight loss calculator on this page can help estimate potential weight loss at different doses, based on clinical trial data. Remember that individual results vary, and medication is always used alongside diet and exercise changes.
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.