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 BMI Is 9.9 Stone in Pounds?
9.9 stone is equivalent to 138.6 pounds or approximately 62.8 kilograms. Your BMI at this weight depends entirely on your height — the same weight can fall into different NHS health categories depending on how tall you are. Use our free BMI calculator above to find your personal BMI instantly, or read on to see what BMI 9.9 stone gives at different heights across the UK. We've included NHS category breakdowns so you can understand what your result means for your health.
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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.
BMI at 9.9 Stone — Examples by Height
To convert kilograms to stone and understand your BMI, you need both weight and height. Here's what BMI 9.9 stone gives at common UK heights:
- 5ft 2in (157cm): BMI 25.7 — Overweight category
- 5ft 4in (163cm): BMI 24.0 — Healthy weight range
- 5ft 6in (168cm): BMI 22.7 — Healthy weight range
- 5ft 8in (173cm): BMI 21.6 — Healthy weight range
- 5ft 10in (178cm): BMI 20.5 — Healthy weight range
- 6ft 0in (183cm): BMI 19.5 — Healthy weight range
As you can see, how many stone and pounds you carry affects health differently at different heights. Taller individuals tend to have lower BMI values at the same weight — a stone to kg conversion shows 9.9 stone (62.8 kg) is relatively light for taller adults but may be overweight for shorter individuals.
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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 Your BMI Category
The NHS uses these BMI ranges for adults:
- Below 18.5: Underweight
- 18.5–24.9: Healthy weight
- 25.0–29.9: Overweight
- 30.0+: Obese
Remember that BMI is a screening tool and has limitations — it doesn't account for muscle mass, bone density, or where fat is stored. Your waist circumference and overall fitness matter too. For South Asian, Chinese, Black African, or Black Caribbean adults, the NHS recommends lower thresholds. Use the weight converter on this page to check your weight in different units, and speak with your GP for personalised health advice about what your weight means for you specifically.
- 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 9.9 stone in pounds exactly?
9.9 stone equals 138.6 pounds. Since 1 stone = 14 pounds exactly, multiply 9.9 by 14. You can use our free weight converter above to switch between stone, pounds, and kilograms instantly for any weight.
What is 9.9 stone in kilograms?
9.9 stone is approximately 62.8 kg. Using the stone to kg conversion formula (stone × 6.35029 = kg), this weight is quite light — around the lower end of a healthy weight for most UK adults, depending on height.
Is 9.9 stone a healthy weight?
It depends on your height. At 9.9 stone, a person who is 5ft 4in would have a healthy BMI of 24.0. Someone 5ft 2in would have BMI 25.7 (overweight), while someone 6ft tall would have BMI 19.5 (healthy). Use our BMI calculator to check your personal BMI.
How do I calculate BMI from weight in stone?
Convert stone to kg first (stone × 6.35029), then use BMI = weight(kg) ÷ height(m)². For example, 9.9 stone (62.8 kg) at 1.73m gives BMI = 62.8 ÷ (1.73)² = 21.0. Our free BMI calculator does this automatically.
What's the healthy weight range at my height?
A healthy BMI is 18.5–24.9. To find your healthy weight range, multiply 18.5 and 24.9 by your height in metres squared. For example, at 5ft 8in (1.73m), healthy weight is roughly 8st 10lbs to 11st 10lbs. Use our BMI calculator above for your exact range.
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.