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
Is 78kg a Healthy Weight? Convert to Stone and Check Your Range
78 kilograms converts to approximately 12 stone 4 pounds (12st 4lbs) using the standard kg to stone conversion. Whether this is a healthy weight depends entirely on your height — the same weight can be perfectly healthy for a tall person but overweight for someone shorter. The NHS uses BMI (body mass index) combined with height to determine healthy weight ranges. Use our free BMI calculator above to check where your weight falls, then read on to see what it means for your health.
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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 at Different Heights
At 78kg (12st 4lbs), whether you're in a healthy weight range depends on your height. Here's how this weight sits across common UK heights:
- At 5ft 4in (163cm): BMI = 29.7 (overweight, just below obese) — healthy range for this height is 49–66kg
- At 5ft 8in (173cm): BMI = 26.1 (overweight) — healthy range is 55–74kg
- At 5ft 10in (178cm): BMI = 24.6 (healthy weight) — healthy range is 59–79kg
- At 6ft 0in (183cm): BMI = 23.3 (healthy weight) — healthy range is 62–84kg
For adults of South Asian, Chinese, Black African, or Black Caribbean heritage, the NHS recommends slightly lower healthy weight thresholds — ask your GP if this applies to you. Use our weight converter to switch between kilograms and stone instantly, or try our BMI calculator to find your exact BMI and healthy weight range 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.
NHS Guidance: What If You're Outside Your Healthy Range?
If 78kg puts you above your healthy weight range, the NHS recommends losing weight gradually at a rate of 0.5–1kg per week — this is sustainable and safe. Small changes matter: even losing 5–10% of your body weight can meaningfully improve blood pressure, blood sugar control, and overall health. Beyond BMI, waist measurement also matters: men should aim for under 94cm (37 inches), women under 80cm (31.5 inches). If you're significantly above your healthy range or have health concerns, speak to your GP about a personalised weight management plan. They can discuss lifestyle changes, dietary support, or whether prescription medication might be appropriate for you.
- 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 78kg in stone and pounds?
78kg converts to 12 stone and 4 pounds (12st 4lbs) in UK measurements. To convert kilograms to stone, divide by 6.35029. Our free weight converter on this page converts instantly between kg, stone, and pounds.
Is 78kg a healthy weight?
It depends on your height. At 5ft 8in, 78kg is overweight (BMI 26.1). At 5ft 10in, it's in the healthy range (BMI 24.6). Use the BMI calculator above to check your personal BMI — it's the best way to know if your weight is healthy for your specific height.
What's the healthy weight range for someone 78kg?
If you're 78kg, your healthy weight range depends on your height. For example, at 5ft 8in, healthy weight is 55–74kg. At 5ft 10in, it's 59–79kg. Calculate your exact range using our free BMI calculator on this page.
What should I do if 78kg is above my healthy weight?
The NHS recommends losing 0.5–1kg per week through a combination of reduced-calorie diet and increased physical activity. Even losing 5–10% of body weight improves health significantly. Speak to your GP about a personalised plan — they can discuss lifestyle changes or whether medical support might help.
How do I know if my weight affects my health?
Beyond weight, waist measurement matters. Men should aim for under 94cm, women under 80cm. Your GP can assess your overall health risk based on weight, height, waist, blood pressure, and family history. They can offer personalised guidance even if your BMI is in the healthy range.
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.