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
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Formula For Pounds To Kg — UK Weight Conversion
Converting pounds to kilograms is straightforward using a simple mathematical formula. The conversion factor is 1 pound equals 0.453592 kilograms. To convert any weight in pounds to kg, simply multiply the pound value by 0.453592. This formula works for all weights and is the standard used by NHS guidance and UK health services. Understanding this conversion is helpful when interpreting UK health information, comparing international weight data, or tracking your weight across different measurement systems commonly used in the UK.
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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.
How To Convert Pounds To Kilograms
The pounds to kilograms conversion formula is straightforward: weight in pounds × 0.453592 = weight in kilograms. This conversion factor is exact and recognised by all NHS and UK health services. For example, 150 pounds equals 68.04 kilograms (150 × 0.453592). For quick reference, 1 stone (14 pounds) equals 6.35029 kilograms, making it easy to convert larger weights in UK measurements.
Most UK adults use stone and pounds for personal weight, but NHS clinical guidance, health apps, and international health standards use kilograms. Being able to convert between these units helps you understand your BMI, compare weight loss progress, and engage with UK health information effectively. The conversion works in reverse too: to convert kg to pounds, divide by 0.453592 or multiply by 2.20462.
For precise conversions, use our free weight converter above, which instantly switches between kg, stone, and pounds for you.
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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.
Why This Matters For UK Health Guidance
Understanding pound to kilogram conversion is essential for UK health contexts. Your GP may discuss your weight in either unit, NHS health calculators typically use kilograms, and international weight loss research is published in kg. Being comfortable with both measurements ensures you can track your health accurately and understand NHS guidance on healthy weight ranges.
For example, NHS healthy weight ranges are expressed in BMI (calculated using kilograms and height in metres), making kilogram conversion useful when checking if your weight falls within NHS recommendations. If you're tracking weight loss using Mounjaro, Wegovy, or other weight management support, your prescriber will likely record progress in kilograms, so the conversion formula becomes a practical daily tool.
- 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 the exact conversion factor from pounds to kg?
The exact conversion factor is 1 pound = 0.453592 kilograms. To convert any weight in pounds to kilograms, multiply the pound value by 0.453592. This is the standard scientific conversion used by NHS health services and all UK health guidance.
How do I convert 200 pounds to kilograms?
To convert 200 pounds to kilograms, multiply 200 by 0.453592. The result is 90.7184 kilograms, or approximately 90.7 kg. You can use our free weight converter above for instant, accurate conversions of any weight.
Why does the NHS use kilograms instead of pounds?
The NHS uses kilograms because it aligns with international medical standards and metric systems used across Europe and clinical research. Kilograms are the standard unit in scientific healthcare settings, making it easier to compare health data across countries and reference clinical guidelines.
Can I use this formula to convert stone and pounds to kg?
Yes. First convert stone to pounds (1 stone = 14 pounds), add any additional pounds, then multiply the total by 0.453592. For example, 10 stone 7 pounds = 147 pounds = 66.68 kg. Our weight converter handles this automatically if you input stone and pounds.
How does this formula relate to BMI calculations?
BMI calculations require weight in kilograms and height in metres. Once you've converted your weight from pounds to kilograms using this formula, you can use our free BMI calculator above to check your BMI and see where you fall on NHS healthy weight ranges.
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.