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 78 Kilos a Healthy Weight?
78 kilos in stones and pounds equals 12 stone 3 pounds (12st 3lbs). Whether this weight is healthy for you depends entirely on your height. The same weight can be perfectly healthy for a tall adult but overweight for someone shorter. Use our free BMI calculator above to check your personal BMI instantly — it's the quickest way to see whether 78kg falls in the healthy range for your specific height and age.
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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 78 kilos, your weight status depends on your height. Here are three realistic examples showing how the same weight converts differently across heights:
- At 5ft 10in (178cm): 78kg gives a BMI of 25.2 — this falls in the overweight range (just above the healthy threshold of 24.9). You'd be within the healthy range at approximately 71kg or below.
- At 5ft 11in (180cm): 78kg gives a BMI of 24.3 — this falls in the healthy weight range. The healthy range at this height is roughly 65–81kg (10st 3lbs to 12st 11lbs).
- At 5ft 8in (173cm): 78kg gives a BMI of 26.1 — this falls in the overweight range. The healthy range at this height is approximately 55–74kg (8st 9lbs to 11st 9lbs).
These examples show why converting kilograms to stone and pounds alone isn't enough — your height is essential for context.
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
The NHS recommends a healthy BMI between 18.5 and 24.9 for UK adults. At 78kg, whether you're in this range depends on your height. Beyond BMI, the NHS also recommends checking your waist circumference — increased health risk begins at 94cm (37 inches) for men and 80cm (31.5 inches) for women. If 78kg puts you in the overweight or obese range, your GP can discuss sustainable weight management options, which might include lifestyle changes, behaviour support, or in some cases, prescription treatment. Remember, even losing 5–10% of body weight brings meaningful health benefits.
- 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 kilos to stones and pounds?
78kg equals 12 stone 3 pounds (12st 3lbs). To convert kilograms to stone, divide by 6.35029. You can also use our free weight converter on this page to switch between kg, stone, and lbs instantly for any weight value.
Is 78kg overweight or healthy?
It depends on your height. At 5ft 10in, 78kg is overweight. At 5ft 11in, it's healthy. At 5ft 8in, it's overweight. Use our BMI calculator above to check your exact BMI — it accounts for both weight and height to give you a personalised answer.
What's the healthy weight range for my height?
The healthy BMI range (18.5–24.9) translates to different weights depending on height. For example, at 5ft 8in the healthy range is roughly 55–74kg; at 5ft 10in it's roughly 63–84kg. Your GP can advise on the healthy range for your specific height and circumstances.
Should I lose weight at 78kg?
Only your GP can advise. If your BMI or waist measurement indicates increased health risk, your GP might discuss sustainable weight loss options — usually starting with lifestyle changes like a reduced-calorie diet and increased physical activity. In some cases, prescription support may be appropriate.
What's the healthy waist measurement to go with 78kg?
The NHS recommends waist circumference below 94cm (37 inches) for men and 80cm (31.5 inches) for women. Your waist measurement matters as much as your weight — excess fat around the middle carries greater health risk. Your GP can measure this during a health check.
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.