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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78 Kg Into Stone — What's Your BMI?
78 kilograms is equal to 12 stone and 3 pounds (12st 3lbs) in UK measurements. However, whether this weight is healthy for you depends entirely on your height. The same weight can give very different BMI results — anywhere from underweight to obese — depending on how tall you are. Let's look at what BMI means at 78kg for various heights, and where it falls on the NHS scale.
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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.
78 Kg BMI At Different Heights
BMI is calculated by dividing weight in kilograms by height in metres squared. At 78kg, here's what your BMI would be at common UK heights:
- 5ft 2in (157cm): BMI 31.7 — Obese (Class I) category
- 5ft 5in (165cm): BMI 29.6 — Overweight category
- 5ft 8in (173cm): BMI 27.3 — Overweight category
- 5ft 10in (178cm): BMI 25.5 — Healthy weight category
- 6ft 0in (183cm): BMI 23.3 — Healthy weight category
Use our free BMI calculator above to find your personal BMI instantly by entering your exact height and weight. The BMI calculator will also show you your healthy weight range for your height according to NHS guidelines.
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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 BMI Categories & What They Mean
The NHS uses these standard BMI categories for UK adults:
- Below 18.5: Underweight
- 18.5 – 24.9: Healthy weight
- 25.0 – 29.9: Overweight
- 30.0 – 34.9: Obese (Class I)
- 35.0 – 39.9: Obese (Class II)
- 40.0+: Severely obese (Class III)
Note: BMI doesn't account for muscle mass, so athletes may have a higher BMI despite low body fat. If you're unsure what your BMI means for your health, discuss it with your GP. Our weight converter tool can also help you track your weight in different units as you progress.
- 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 equals 12 stone and 3 pounds (12st 3lbs) exactly. To convert kilograms to stone, divide by 6.35029. For 78kg: 78 ÷ 6.35029 = 12.29 stone, which is 12 stone plus 0.29 × 14 pounds = 12st 3.9lbs.
Is 78kg overweight for a 5ft 8in person?
At 5ft 8in (173cm), a weight of 78kg gives a BMI of 27.3, which falls in the overweight category. NHS considers 18.5–24.9 as healthy weight, so yes, 78kg would be classified as overweight at this height. Your healthy range would be approximately 55–74kg.
What height would make 78kg a healthy weight?
At approximately 6ft 0in (183cm) or taller, 78kg would fall within the healthy BMI range of 18.5–24.9. At 6ft (183cm), 78kg gives a BMI of 23.3. Height makes a significant difference — the same weight is overweight for shorter people and healthy for taller people.
What is 78kg in just pounds?
78kg converts to approximately 172 pounds. The conversion is: 78kg × 2.20462 = 171.96 lbs. In UK measurements, we typically express this as stone and pounds (12st 3lbs) rather than just pounds alone.
How much weight would I need to lose from 78kg to reach healthy BMI?
It depends on your height. At 5ft 5in, you'd need to lose about 6–8kg to reach a healthy BMI (18.5–24.9). At 5ft 8in, losing 5–7kg would help. Use our weight loss calculator to estimate potential weight loss with different approaches, or speak to your GP for personalised advice.
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.