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
78 Lbs To Kg — Is This A Healthy Weight?
78 pounds converts to approximately 35.4 kilograms. Whether this is a healthy weight depends entirely on your height. A weight that is healthy for one person may be significantly underweight or overweight for another. This guide explains how to assess if 78 lbs is right for you using NHS guidelines, shows you healthy weight ranges across different heights, and helps you understand where your weight sits on the health spectrum. Use our free BMI calculator above to find your personal health status instantly.
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.
Healthy Weight Ranges At Different Heights
At 78 lbs (35.4 kg), whether you're at a healthy weight depends on your height. Here are three concrete examples:
- At 4ft 10in (147 cm): 78 lbs gives a BMI of 21.8 — this falls in the healthy weight range (18.5–24.9).
- At 5ft 4in (163 cm): 78 lbs gives a BMI of 13.4 — this is below the underweight threshold of 18.5 and may indicate insufficient weight for your height.
- At 5ft 9in (175 cm): 78 lbs gives a BMI of 11.5 — this is significantly underweight and would require medical attention.
To convert 78 lbs to stone, simply divide by 14: 78 ÷ 14 = 5 stone 8 pounds. For a quick metric to imperial weight check, use our free weight converter on this page to see your exact measurements in both kg and stone.
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.
NHS Guidance And What To Do Next
According to NHS guidance, a healthy BMI is between 18.5 and 24.9 for most UK adults. If your BMI at 78 lbs falls outside this range, your next step is to speak with your GP. They can assess your individual health, consider your medical history, and discuss whether your current weight is appropriate for you. BMI is a useful screening tool but doesn't account for muscle mass, bone density, or where fat is stored — your GP will take a holistic view. If you're concerned about your weight, your GP can refer you to an NHS weight management service or discuss lifestyle changes. Track your progress with our free progress tracker once you have a plan in place.
- 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 78 lbs to kg?
Divide 78 by 2.20462. This gives 35.4 kg. Alternatively, multiply 78 × 0.453592 = 35.4 kg. Use our free weight converter above for instant conversions between kg, stone, and pounds.
Is 78 lbs a healthy weight?
It depends on your height. At 4ft 10in, it's healthy (BMI 21.8). At 5ft 4in, it's underweight (BMI 13.4). At 5ft 9in, it's significantly underweight (BMI 11.5). Use our free BMI calculator to check your personal BMI.
What is 78 lbs in stone and pounds?
78 lbs equals 5 stone 8 pounds (5st 8lbs). This is the UK measurement used by most health services. Convert between units instantly using the weight converter on this page.
When should I see my GP about my weight?
If your BMI is below 18.5 or above 29.9, or if you have concerns about your health, speak with your GP. They can assess whether your weight is appropriate for you and discuss any health implications or next steps.
How accurate is BMI for assessing healthy weight?
BMI is a useful screening tool but has limitations — it doesn't distinguish between muscle and fat. For a complete picture, your GP may also check your waist circumference. Men over 94 cm and women over 80 cm have increased health risk, regardless of BMI.
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.