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
Is 10.5 Kg A Healthy Weight?
10.5 kg converts to approximately 23.1 pounds. Whether this is a healthy weight depends entirely on your height — the same weight can be healthy for one person and underweight for another. This guide shows you how to check if 10.5 kg is in the healthy range for your height using NHS guidelines, and what to do if you're concerned about your weight.
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.
Healthy Weight Ranges By Height
At 10.5 kg, your weight falls into the lower range of adult weights. To check if it's healthy for you, use our free BMI calculator above — it takes your height and weight and calculates your BMI instantly.
Here are three real-world examples using the kg to stone conversion (10.5 kg = 1 stone 7.4 lbs):
- Someone 150 cm tall (4ft 11in): 10.5 kg gives a BMI of 4.7 — significantly underweight. Healthy range would be 41–56 kg (6st 6lbs to 8st 12lbs).
- Someone 160 cm tall (5ft 3in): 10.5 kg gives a BMI of 4.1 — significantly underweight. Healthy range would be 47–64 kg (7st 6lbs to 10st 1lb).
- Someone 180 cm tall (5ft 11in): 10.5 kg gives a BMI of 3.2 — significantly underweight. Healthy range would be 60–80 kg (9st 6lbs to 12st 8lbs).
According to NHS guidelines, a healthy BMI is between 18.5 and 24.9 for most adults. At 10.5 kg, this weight is likely to be significantly below the healthy range for adult heights.
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.
What To Do If You're Underweight
If you're at or below 10.5 kg, it's important to speak with your GP, as being significantly underweight can affect your health. Your GP can assess whether your weight is a concern and discuss any underlying causes — such as medical conditions, medications, or nutritional factors.
Use our weight converter to track your weight in whichever unit you prefer (kg, stone, or pounds), and consider using our progress tracker to monitor changes over time. The NHS also recommends checking your waist measurement: for men, a healthy waist is under 94 cm (37 inches); for women, under 80 cm (31.5 inches). If you're concerned about your weight or health, your GP is always the best starting point for personalised guidance.
- 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 10.5 kg in stone and pounds?
10.5 kg converts to 1 stone and 7.4 pounds (or 1st 7.4lbs). To convert kilograms to stone, divide by 6.35. Use our free weight converter above for instant conversions between kg, stone, and pounds — it's useful for tracking weight changes in whatever unit you prefer.
Is 10.5 kg underweight for an adult?
At 10.5 kg, this weight is significantly underweight for virtually all adult heights. For reference, the average adult woman in the UK weighs around 71.6 kg, and the average adult man weighs around 85.7 kg. If you weigh 10.5 kg, please speak with your GP as soon as possible.
What is the healthy weight range for my height?
A healthy weight depends on your height. Use our BMI calculator above to find your personal healthy weight range — it calculates this based on NHS guidelines automatically. Alternatively, multiply your height in metres squared by 18.5 (lower bound) and 24.9 (upper bound) to find your healthy range in kilograms.
Should I be concerned about being this light?
Yes, 10.5 kg is significantly below the healthy weight range for any adult. Being severely underweight can affect your immune system, bone health, and energy levels. Contact your GP for a health assessment — they can investigate any underlying causes and provide personalised support.
How can I track weight changes if I'm underweight?
Use our free progress tracker to log your weight regularly and monitor trends over time. Tracking in stone and pounds (UK measurements) or kilograms helps you see progress. Your GP may also refer you to a dietitian or specialist if there are health concerns — they can advise on safe, appropriate weight gain strategies.
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.