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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What is 7.7 lbs in kilograms?
7.7 lbs is equal to 3.49 kg. This is a straightforward weight conversion between imperial and metric measurements, commonly used in the UK where we often need to switch between stone and pounds and kilograms. Whether you're checking medication doses, tracking fitness progress, or converting between different health measurement systems, understanding how to convert pounds to kilograms is useful. Use our free weight converter above to instantly switch between metric to imperial weight measurements, or read on for the conversion formula and nearby values.
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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.
Conversion Table and Formula
To convert 7.7 lbs to kg, use this simple formula: lbs ÷ 2.20462 = kg. So 7.7 ÷ 2.20462 = 3.49 kg exactly.
Here's a quick reference table showing 7.7 lbs alongside nearby values for easy comparison:
- 5.5 lbs = 2.49 kg
- 6.6 lbs = 2.99 kg
- 7.7 lbs = 3.49 kg
- 8.8 lbs = 3.99 kg
- 9.9 lbs = 4.49 kg
- 11 lbs = 4.99 kg
- 12.1 lbs = 5.49 kg
Remember: 1 kilogram = 2.20462 pounds. This conversion works in both directions—you can also multiply kilograms by 2.20462 to get pounds, or divide pounds by this figure to get kilograms. For additional conversions between kg to stone and other imperial units, use our free weight converter.
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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.
What Does 3.49 kg Mean for UK Health?
At 3.49 kg, this weight is too light for an adult and would indicate severe underweight status on any BMI scale. However, 3.49 kg is a normal weight for a newborn baby (UK average newborn weight is 3.4–3.6 kg), or for measuring small portions in nutrition and medication contexts.
For adult health context, our free BMI calculator above shows how your personal weight relates to your height and NHS healthy weight ranges. If you're tracking weight changes—whether for fitness, medical monitoring, or general wellness—our progress tracker lets you log measurements over time to see meaningful trends.
- 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 pounds to kilograms?
Divide the weight in pounds by 2.20462 to get kilograms. So 7.7 lbs ÷ 2.20462 = 3.49 kg. You can also use our free weight converter above for instant conversions between lbs, kg, stone, and other units.
What is the exact conversion factor for pounds to kg?
One pound equals exactly 0.453592 kilograms. Conversely, one kilogram equals 2.20462 pounds. These are the internationally standardised conversion factors used globally.
Is 3.49 kg a healthy weight for an adult?
No—3.49 kg is far too light for any adult and would indicate severe underweight status. However, it is a normal weight for a newborn baby. For adult health assessment, use our BMI calculator to check your weight against NHS healthy ranges.
Can I convert stones and pounds to kilograms?
Yes. First convert stone to pounds (multiply stone by 14), add any additional pounds, then divide the total by 2.20462. Alternatively, use our free weight converter which handles all these conversions instantly.
Why do UK measurements use both pounds and kilograms?
The UK uses both imperial (stone, pounds) and metric (kilograms) systems. NHS clinical records use kilograms, but many UK adults still prefer stone and pounds for personal weight tracking. Our weight converter bridges both systems.
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.