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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7.8 Kilos in Pounds — Healthy Weight Guide
7.8 kilos is equivalent to 17.2 pounds. However, whether this weight is healthy for you depends entirely on your height — a metric that matters far more than the number itself. This guide explains how to convert 7.8 kilos in pounds and assess whether this weight falls within the healthy range for your individual height using NHS guidelines. Our free BMI calculator can help you determine your personal healthy weight range in seconds.
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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.
Healthy Weight Ranges by Height
To understand if 7.8kg (17.2 lbs) is healthy for you, you need to consider your height. Here are three real-world examples showing how the same weight can be healthy or underweight depending on how tall you are:
- At 1.40m (4ft 7in): 7.8kg gives a BMI of 4.0 — dangerously underweight. Healthy weight range: 19–27kg (42–60 lbs).
- At 1.65m (5ft 5in): 7.8kg gives a BMI of 2.9 — severely underweight. Healthy weight range: 50–68kg (110–150 lbs).
- At 1.80m (5ft 11in): 7.8kg gives a BMI of 2.4 — severely underweight. Healthy weight range: 60–80kg (132–176 lbs).
As you can see, 7.8 kilos is far below the healthy weight for any adult height. Use our weight converter to check your current weight in different units, then our BMI calculator to see your personal healthy range based on your actual height.
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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 7.8kg a Healthy Adult Weight?
No — 7.8 kilos (17.2 pounds) is significantly underweight for any adult. The NHS defines a healthy BMI as 18.5 to 24.9 for most adults, and lower thresholds (18.5–22.9) for people of South Asian, Chinese, Black African, or Black Caribbean heritage. At 7.8kg, your BMI would be dangerously low regardless of height. If you weigh this much, speak to your GP promptly. Being severely underweight can cause serious health problems including muscle loss, weakened immunity, bone loss, and nutritional deficiencies. Your GP can assess your individual situation and refer you to appropriate support.
- 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 7.8 kilos in pounds exactly?
7.8 kilos equals 17.2 pounds exactly. To convert kilograms to pounds, multiply by 2.20462. Conversely, to convert from pounds back to kilograms, divide by 2.20462. This applies to any weight measurement when converting between metric and imperial weight units.
Is 7.8kg healthy for an adult?
No. 7.8kg is severely underweight for any adult, regardless of height. A healthy adult weight typically ranges from 45kg to over 100kg depending on height. If you weigh 7.8kg, please contact your GP urgently for a health assessment.
How do I find my healthy weight range?
Use the free BMI calculator on this page. Enter your height and current weight to see your BMI and your personal healthy weight range. The NHS recommends a BMI of 18.5–24.9 for most adults. Your healthy weight also depends on muscle mass, bone density, and individual health factors — your GP can provide personalised advice.
What if I'm significantly underweight?
Being severely underweight can cause serious health problems. Speak to your GP immediately if you weigh substantially less than the healthy range for your height. They can assess your nutrition, medical history, and refer you to appropriate support such as dietitian services or specialist care if needed.
How do I convert between metric and imperial weight?
To convert kilograms to stone and pounds (common in the UK), divide kg by 6.35. For kilograms to pounds only, multiply by 2.20462. Our free weight converter on this page makes conversions instant — simply enter your weight in any unit and switch between kg, stone, and lbs instantly.
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.