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 10.5 Kg — And What Does It Mean?
10.5 kg converts to approximately 23.1 pounds (23 lbs). However, your BMI — the main NHS health measure for this weight — depends entirely on your height. At different heights, 10.5 kg produces very different BMI results. Below, we show what BMI you'd have at common UK heights, plus which NHS weight category each falls into. Use our free BMI calculator above to check your exact BMI instantly, or our weight converter to switch between kg, stone, and lbs.
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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.
10.5 Kg BMI at Different Heights
10.5 kg is an extremely low body weight — well below healthy range for adult bodies. Your BMI at this weight depends on your height:
- At 150 cm (4ft 11in): BMI = 4.7 (severely underweight)
- At 160 cm (5ft 3in): BMI = 4.1 (severely underweight)
- At 170 cm (5ft 7in): BMI = 3.6 (severely underweight)
- At 180 cm (5ft 11in): BMI = 3.2 (severely underweight)
- At 190 cm (6ft 3in): BMI = 2.9 (severely underweight)
All of these BMI values fall far below the NHS healthy weight range (BMI 18.5–24.9). At 10.5 kg, medical support would be necessary. If you're concerned about your weight or that of someone else, please contact your GP urgently.
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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 Weight Categories and BMI Limitations
The NHS uses BMI categories to screen for health risk, but BMI has important limitations. BMI does not distinguish between muscle and fat — it's based purely on weight and height. It also doesn't account for where fat is stored, age-related muscle loss, or ethnicity-specific risk factors. For adults of South Asian, Chinese, Black African, or Black Caribbean heritage, the NHS recommends lower BMI thresholds due to higher cardiovascular and diabetes risk at the same weights. Calculate your BMI using the free BMI calculator on this page for your personal context, then discuss any concerns with your GP.
- 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 10.5 kg to pounds?
Multiply 10.5 by 2.20462. This gives 23.1 lbs (or 23 pounds). Use our free weight converter above to convert between kg, stone, and lbs instantly for any weight.
Is 10.5 kg a healthy weight for an adult?
No. 10.5 kg is far below the healthy weight range for any adult height. This weight would typically indicate severe underweight status requiring medical assessment. Please contact your GP if this applies to you or someone you know.
What is the NHS healthy weight range?
For most UK adults, a healthy BMI is 18.5 to 24.9. Healthy weight range depends on your height — use our BMI calculator to find your personal healthy weight range, or ask your GP for guidance.
Why does my BMI depend on height?
BMI is calculated as weight (kg) divided by height squared (metres). Taller people have proportionally more body volume, so the same weight produces a lower BMI. This is why BMI must account for both measurements.
Should I be concerned if my BMI is very low?
Yes. Very low BMI (below 18.5) can indicate underweight status, which carries health risks including weakened immunity, bone loss, and nutritional deficiency. Contact your GP for a health assessment if your BMI is significantly below the healthy 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.