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 45 Kg in Stone and Pounds?
45 kilograms converts to 7 stone and 1.6 pounds (7st 1.6lbs) — the standard UK measurement for body weight. Whether you're checking your own weight, monitoring a child's growth, or simply curious about metric to imperial conversion, understanding how to convert kg to stone is useful in the UK where both measurements are commonly used. Our free weight converter above makes this calculation instantly, and we'll also look at what this weight means in terms of health context for UK adults.
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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.
Converting 45 Kg to Stone and Pounds
To convert 45kg to stone and pounds, use the standard UK conversion formula: one stone equals 6.35029 kilograms. Using this calculation, 45 kg = 7 stone 1.6 pounds (7st 1.6lbs).
- 45 kg ÷ 6.35029 = 7.07 stone
- 0.07 stone × 14 pounds per stone = 1.6 pounds
- Final result: 7 stone 1.6 pounds
This conversion is exact and aligns with NHS health measurement standards across the UK. Use the free weight converter on this page to instantly convert between kg, stone, and pounds for any weight value. The same conversion method applies whether you're tracking personal weight, medical measurements, or general health information.
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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.
Is 45 Kg a Healthy Weight?
Whether 45kg is a healthy weight depends entirely on your height. The NHS uses Body Mass Index (BMI) to assess healthy weight ranges — BMI is calculated from both weight and height together. For example, at 160cm tall, 45kg gives a BMI of 17.6 (healthy range). At 150cm, it's 20 (healthy range). At 180cm, it's 13.9 (underweight). Use our free BMI calculator above to check your personal BMI — this gives you individualised health context rather than weight alone.
- 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 does 45kg equal in pounds only?
45kg equals 99.2 pounds (lbs). To convert: 45 kg × 2.20462 = 99.2 lbs. This is the direct kilogram-to-pounds conversion, though in the UK we typically express body weight in stone and pounds combined (7 stone 1.6 pounds) rather than pounds alone.
Is 45kg underweight, healthy, or overweight?
This depends on your height. BMI categories require both weight and height. At an average adult height of 165cm, 45kg would be underweight (BMI 16.5). At 155cm, it's healthy (BMI 18.8). At 175cm, it's underweight (BMI 14.7). Use the BMI calculator on this page with your actual height for your personal health context.
How does 45kg compare to average UK adult weight?
Average UK adult weight is approximately 85.7kg for men and 71.6kg for women (ONS data). 45kg is significantly below these averages and would only be healthy for shorter adults, teenagers, or those with smaller frames. Your GP can advise if your weight is healthy for your individual circumstances.
What does 45kg in stone mean for health monitoring?
45kg (7st 1.6lbs) is a useful reference point when tracking weight changes, discussing health with your GP, or using health calculators. The NHS Health Check and weight loss programmes both use kg and stone interchangeably. Convert your measurements as needed for the healthcare service or tool you're using.
Can I use 45kg for BMI and weight loss calculations?
Yes. Whether you're monitoring your own weight, using a weight loss calculator, or tracking progress with our free progress tracker, 45kg is a complete measurement. For weight loss projections with medications like Wegovy or Mounjaro, you'd enter your weight in kg or stone — the GLP-1 weight loss calculator on this site accepts both.
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.