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 45kg In Stone?
45kg is equivalent to 7 stone and 1.8 pounds (or 99.2 lbs) using the standard UK conversion. To convert kilograms to stone, divide the kilogram value by 6.35029. This weight falls in the healthy weight range for most adults, depending on height. Use our free weight converter above to switch between kg, stone, and pounds instantly, and try our BMI calculator to see how this weight relates to your personal health profile based on your height.
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.
How to Convert 45kg to Stone
Converting 45kg to stone is straightforward using the exact conversion formula. 45kg ÷ 6.35029 = 7.09 stone, which equals 7 stone 1.8 pounds. This is the precise metric-to-imperial conversion used by NHS health services across the UK.
Breaking this down further: 45kg also equals 99.2 pounds (lbs). Many UK adults use stone and pounds together when discussing body weight, so it's useful to know both values. The weight converter tool on this page calculates all three units instantly — simply enter your weight in kg and see the stone and pound equivalents displayed immediately.
This conversion is based on the exact mathematical relationship: 1 stone = 6.35029 kg, and 1 pound = 0.453592 kg. These are the standard conversion factors used by UK health services and NHS guidance.
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.
Is 45kg a Healthy Weight?
Whether 45kg is a healthy weight depends entirely on your height. According to NHS guidelines, a healthy BMI falls between 18.5 and 24.9. For example, at an average UK adult height of 170cm (5ft 7in), a weight of 45kg would give a BMI of approximately 15.6, which falls below the healthy range.
However, at a shorter height — such as 155cm (5ft 1in) — 45kg would give a BMI of around 18.7, which is within the healthy range. This is why height matters so much when assessing whether a weight is appropriate for individual health. Use our free BMI calculator above to enter your exact height and weight and see your personal BMI category according to NHS standards.
- 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.
Is 45kg considered underweight in the UK?
Whether 45kg is underweight depends on your height. According to NHS BMI guidelines, underweight is below 18.5. At taller heights (170cm+), 45kg may be underweight. At shorter heights (155cm or less), it may be within a healthy range. Use the BMI calculator on this page with your height to check your personal category.
How do I convert 45kg to stone and pounds quickly?
Divide 45 by 6.35 to get stone (7.1 stone), then multiply the decimal by 14 for extra pounds. So 45kg = 7 stone 1.4 pounds. Our free weight converter tool above calculates this instantly — just enter 45 in the kg field.
What is 45kg in pounds only?
45kg equals 99.2 pounds (lbs). This is calculated by multiplying 45 by 2.20462, the exact kilogram-to-pound conversion factor used across UK health services and NHS guidance.
Is 45kg a healthy weight for adults?
This depends on your height and individual health factors. A weight of 45kg may be healthy for some adults (typically shorter individuals) but underweight for others. Your GP or healthcare professional can advise whether this weight is appropriate for your personal health circumstances.
How can I check if 45kg is a healthy weight for my height?
Calculate your BMI using your height and 45kg as your weight. Our free BMI calculator on this page does this instantly and shows you whether you fall in the healthy, underweight, overweight, or obese range according to NHS guidelines.
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.