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 BMI Is 77.5 Kg? Convert To Stone & Check Your Health Category
If you weigh 77.5 kg, your BMI depends entirely on your height. This weight converts to approximately 12 stone and 2 pounds in UK measurements. To understand whether this weight falls into a healthy range for you, you'll need to calculate your personal BMI using your height. Use our free BMI calculator above to find your exact BMI instantly, or read on to see example BMI values at different heights and what they mean according to NHS guidelines.
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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.
BMI At 77.5 Kg — Examples At Different Heights
At 77.5 kg, your BMI varies significantly depending on your height. Here are typical examples:
- 160 cm (5ft 3in): BMI of 30.3 — falls into the obese (Class I) category
- 165 cm (5ft 5in): BMI of 28.5 — falls into the overweight category
- 170 cm (5ft 7in): BMI of 26.8 — falls into the overweight category
- 175 cm (5ft 9in): BMI of 25.3 — falls into the healthy weight category
- 180 cm (5ft 11in): BMI of 23.9 — falls into the healthy weight category
- 185 cm (6ft 1in): BMI of 22.6 — falls into the healthy weight category
For South Asian, Chinese, Black African, or Black Caribbean adults, lower BMI thresholds apply — NHS recommends a healthy BMI of 18.5 to 22.9 rather than 18.5 to 24.9. Calculate your exact BMI using our free weight converter and BMI calculator to check your personal category.
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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 NHS BMI Categories & Limitations
The NHS BMI categories for UK adults are: 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 does not distinguish between muscle and fat — an athlete with significant muscle mass may have a high BMI despite low body fat. BMI also ignores where fat is stored; abdominal fat carries higher health risks than fat stored elsewhere. Your GP can assess your individual health using BMI alongside other measurements like waist circumference, blood pressure, and blood sugar levels for a complete picture of your health.
- 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 77.5 kg in stone and pounds?
77.5 kg converts to 12 stone and 2 pounds (or approximately 12.2 stone). To convert kilograms to stone, divide by 6.35 — so 77.5 ÷ 6.35 = 12.2 stone. Use our free weight converter above to switch between metric and imperial measurements instantly.
Is 77.5 kg a healthy weight?
Whether 77.5 kg is healthy depends on your height and individual circumstances. At taller heights (175 cm and above), this weight typically falls into the healthy BMI range. At shorter heights, it may fall into the overweight or obese category. Your GP can assess your personal health using BMI alongside other factors like waist measurement and blood pressure.
What BMI range is healthy according to NHS guidelines?
The NHS defines healthy weight as a BMI of 18.5 to 24.9 for most UK adults. For people of South Asian, Chinese, Black African, or Black Caribbean heritage, the recommended healthy range is 18.5 to 22.9 because these groups face higher health risks at lower BMI levels. Calculate your BMI using our free BMI calculator above.
Does BMI take muscle mass into account?
No, BMI does not distinguish between muscle and fat. It uses height and weight only. Athletes and people with high muscle mass may have a high BMI despite low body fat. Your GP can assess your health using additional measurements like waist circumference and blood pressure alongside BMI for a more complete picture.
What should I do if my BMI is in the overweight range?
If your BMI falls into the overweight category, your GP can offer personalised guidance. Small, sustainable lifestyle changes — like increasing physical activity and adjusting your diet — often help. Some people may benefit from structured weight management support through NHS tier 2 services, or prescription medication from specialist services. Your GP can discuss what's appropriate for you.
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.