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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What's 77.5 Kg in Stone and What's My BMI?
77.5 kg is approximately 12 stone and 2 pounds in UK measurements. However, your BMI depends entirely on your height — the same weight at different heights produces very different BMI results. Below, we've shown what 77.5 kg means for BMI across common UK adult heights, along with the corresponding NHS health categories. Use our free BMI calculator above to find your exact BMI if you know your height, or explore the weight converter to see the stone and pounds breakdown of 77.5 kg in full detail.
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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.
77.5 Kg BMI at Different Heights
At 77.5 kg, your BMI varies significantly depending on your height. Here's how 77.5 kg converts to BMI at common UK adult heights:
- 5ft 2in (157cm): BMI 31.3 — Obese (Class I)
- 5ft 4in (163cm): BMI 29.0 — Overweight
- 5ft 6in (168cm): BMI 27.4 — Overweight
- 5ft 8in (173cm): BMI 25.9 — Overweight
- 5ft 10in (178cm): BMI 24.4 — Healthy weight
- 6ft 0in (183cm): BMI 23.1 — Healthy weight
These figures are calculated using the standard BMI formula: weight (kg) ÷ height (m)². The same weight produces very different health categories depending on your height — a key reason why BMI alone isn't the full picture of your health. Your GP can help interpret what these figures mean for you personally.
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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 and Limitations
The NHS recognises these BMI categories for UK adults: Underweight (below 18.5), Healthy weight (18.5–24.9), Overweight (25.0–29.9), Obese Class I (30.0–34.9), Obese Class II (35.0–39.9), and Severely Obese (40.0+). However, BMI has important limitations — it doesn't distinguish between muscle and fat, doesn't account for where fat is stored, and doesn't reflect overall fitness or health. For adults of South Asian, Chinese, Black African, or Caribbean heritage, the NHS recommends lower BMI thresholds due to higher health risks at the same weight. Your GP can give you personalised health advice beyond BMI, including waist measurement and other health markers.
- 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 77.5 kg to stone and pounds?
77.5 kg equals approximately 12 stone and 2 pounds (12st 2lbs). Use our free weight converter above to see the exact breakdown instantly. The conversion uses the formula: 77.5 kg ÷ 6.35029 = 12.22 stone, which equals 12 stone plus 0.22 × 14 = 12 stone 3 pounds (rounded).
Is 77.5 kg a healthy weight?
This depends entirely on your height. At 77.5 kg, you could have a BMI ranging from 23.1 (healthy) at 6ft tall, to 31.3 (obese) at 5ft 2in. Use our free BMI calculator above to find your personal BMI. Your GP can also discuss whether this weight is healthy for you individually.
What's my BMI if I'm 5ft 8in and weigh 77.5 kg?
At 5ft 8in (173cm) and 77.5 kg, your BMI is 25.9, which falls in the "overweight" category according to NHS guidelines (25.0–29.9). This suggests discussing lifestyle changes with your GP, such as increased physical activity and balanced nutrition.
Can I use BMI alone to assess my health?
No — BMI is a screening tool but has significant limitations. It doesn't account for muscle mass, where fat is stored, age, or overall fitness. The NHS recommends also measuring waist circumference: over 94cm (men) or 80cm (women) indicates increased health risk. Your GP can provide a fuller health assessment.
Are the BMI categories different for South Asian or Black adults?
Yes — the NHS recommends lower BMI thresholds for adults of South Asian, Chinese, Black African, or Caribbean heritage because these groups face higher risks of type 2 diabetes and heart disease at lower BMI levels. Healthy weight for these groups is 18.5–22.9 rather than 18.5–24.9. Discuss your personal health with your GP.
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.