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 7.8 Pounds in Kilograms?
7.8 pounds is equivalent to 3.54 kilograms. To convert pounds to kilograms, divide the pound value by 2.20462 — this is the standard metric to imperial weight conversion used throughout the UK and NHS. Whether you're checking a baby's weight, comparing medication dosages, or understanding health measurements, our free weight converter above makes switching between kg, stone, and pounds instant and accurate.
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.
7.8 Pounds to Kg Conversion Table
7.8 pounds = 3.54 kg
To convert any pound value to kilograms, use this formula: pounds ÷ 2.20462 = kilograms. For 7.8 lbs: 7.8 ÷ 2.20462 = 3.54 kg.
Here's a quick reference table showing 7.8 lbs in context with nearby values:
- 6.8 lbs = 3.08 kg
- 7.0 lbs = 3.18 kg
- 7.5 lbs = 3.40 kg
- 7.8 lbs = 3.54 kg
- 8.0 lbs = 3.63 kg
- 8.5 lbs = 3.86 kg
- 9.0 lbs = 4.08 kg
This conversion is exact and follows the international standard where 1 pound = 0.453592 kilograms. Use our weight converter tool above to instantly convert between kg, stone and pounds.
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 3.54 kg a Healthy Weight for Adults?
At 3.54 kg (7.8 lbs), this weight is appropriate for newborn babies or very young infants — not for adults or older children. Average UK newborns weigh between 3.5 and 3.8 kg at birth, making this a normal infant weight range.
For adult health assessments, use our free BMI calculator above to check your personal healthy weight range at your height. NHS guidelines recommend a healthy BMI between 18.5 and 24.9 for most adults, though South Asian and Black African or Caribbean adults may have lower thresholds. If you're tracking weight changes or managing a health condition, our progress tracker can help you log measurements over time.
- 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 7.8 pounds to kilograms manually?
Divide 7.8 by 2.20462. This gives you 3.54 kg. The conversion factor 2.20462 is the standard used by the NHS and international health organisations. You can use our free weight converter above for instant conversions without a UK pharmacy calculation.
Is 7.8 pounds a normal baby weight?
Yes. Average UK newborns weigh between 3.5 and 3.8 kg (7.7 to 8.4 lbs), so 7.8 lbs falls within the normal range. If you're tracking an infant's weight, your health visitor or GP will provide personalised guidance on healthy growth patterns.
What is 7.8 pounds in stone?
7.8 pounds equals 0.557 stone (or roughly half a stone). To convert: divide 7.8 by 14, since 1 stone = 14 pounds exactly. Try our weight converter above to switch between all three units instantly.
Why do UK health services use both kg and stone?
The NHS uses kilograms for clinical measurements and international consistency, but UK adults often prefer stone and pounds in everyday life. Both are equally valid — our converter supports all three units so you can use whichever measurement feels most natural.
How do I check if my weight is healthy?
Use our free BMI calculator to find your healthy weight range based on your height. BMI is a screening tool, but it has limitations — it doesn't distinguish muscle from fat. Your GP can provide personalised health advice about what your weight means for your individual circumstances.
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.