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
78.8 kg in Lbs — What's Your BMI?
78.8 kg converts to approximately 173.7 lbs or 12 stone 5.7 lbs in UK measurements. However, your BMI at this weight depends entirely on your height. Use our free BMI calculator above to find your exact BMI, or read on for example BMI values at common heights. Understanding how weight relates to height helps you assess whether you're in a healthy range according to NHS guidelines.
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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.
What BMI Does 78.8 kg Give at Different Heights?
At 78.8 kg, your BMI varies significantly depending on your height. Here are typical examples using the standard kg to stone conversion and BMI formula:
- At 160 cm (5ft 3in): BMI 30.7 — Obese (Class I)
- At 165 cm (5ft 5in): BMI 28.9 — Overweight
- At 170 cm (5ft 7in): BMI 27.3 — Overweight
- At 175 cm (5ft 9in): BMI 25.6 — Overweight (upper range)
- At 180 cm (5ft 11in): BMI 24.3 — Healthy weight
- At 185 cm (6ft 1in): BMI 23.0 — Healthy weight
NHS guidelines define a healthy BMI as 18.5 to 24.9. If you fall outside this range, our weight converter and BMI calculator can help you explore what a healthy weight range looks like for your specific 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.
Understanding BMI Categories & Health Context
The NHS uses five main BMI categories for adults. At 78.8 kg (173.7 lbs), whether you're classified as overweight or in a healthy range depends on height. For people of South Asian, Chinese, Black African, or Black Caribbean heritage, the NHS recommends lower thresholds — healthy weight typically starts at BMI 18.5 and overweight begins at 23.0.
BMI is a useful screening tool, but it has limitations. It doesn't distinguish between muscle and fat, and doesn't account for where weight is stored. Waist circumference also matters for cardiovascular health. Your GP can provide personalised guidance based on your individual health picture.
- 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 78.8 kg to stone and pounds?
78.8 kg equals 12 stone 5.7 lbs (or approximately 12 stone 6 lbs). To convert kilograms to stone manually, divide the kg amount by 6.35029. Our weight converter above makes this instant and accurate.
Is 78.8 kg a healthy weight?
It depends on your height. At 78.8 kg, you could be in the healthy, overweight, or obese category depending on how tall you are. Use the BMI calculator on this page to find your personal BMI and NHS category based on your exact height.
What's the healthy weight range for my height at 78.8 kg?
If your BMI at 78.8 kg falls outside the healthy range (18.5–24.9), your GP can discuss whether weight management would benefit your health. For South Asian or Black African heritage, NHS thresholds differ slightly. Use our BMI calculator to check where you stand.
How do I use metric to imperial weight conversions?
Converting between metric (kg) and imperial (stone/lbs) is simple: multiply kg by 2.20462 for pounds, or divide by 6.35029 for stone. Our free weight converter on this page does all calculations instantly and accurately.
What if my BMI is outside the healthy range at this weight?
Your GP can assess your individual health and discuss options. Even modest weight loss of 5–10% can bring meaningful health benefits. You can track your progress with our free progress tracker if you're working towards a healthier weight.
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.