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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77 Pounds in Stone — What's Your BMI?
77 pounds converts to 5.5 stone (or 5 stone 7 pounds) and weighs approximately 34.9 kg. However, your BMI — the health indicator that matters — depends entirely on your height. The same weight can be perfectly healthy for a tall person or indicate overweight for someone shorter. Use our free BMI calculator above to find your personal BMI, or read on to see how 77 pounds affects BMI across different heights using NHS guidelines.
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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.
BMI at Different Heights for 77 Pounds
At 77 pounds (34.9 kg), your BMI varies significantly depending on your height. Here's how this weight translates across typical UK adult heights:
- 160 cm (5ft 3in): BMI 13.6 — Underweight (healthy range is 18.5–24.9)
- 165 cm (5ft 5in): BMI 12.8 — Underweight
- 170 cm (5ft 7in): BMI 12.1 — Underweight
- 175 cm (5ft 9in): BMI 11.4 — Underweight
- 180 cm (5ft 11in): BMI 10.7 — Underweight
At 77 pounds, you fall into the underweight category across all adult heights. The NHS healthy weight range starts at BMI 18.5. If this is your current weight, speak with your GP about whether additional support is needed.
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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 uses BMI as a screening tool to assess health risk, but it's important to understand what it does — and doesn't — measure. BMI does not distinguish between muscle and fat, so athletes or very muscular individuals may have a high BMI despite low body fat.
For adults of South Asian, Chinese, Black African, or Black Caribbean heritage, the NHS recommends lower BMI thresholds due to higher health risk at the same weight. Your GP can discuss whether your BMI is appropriate for your individual health, medical history, and ethnic background. Our free weight converter above helps you see this weight in different units, and the BMI calculator shows your personal BMI instantly.
- 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.
Is 77 pounds underweight for an adult?
Yes, 77 pounds (34.9 kg / 5.5 stone) is underweight across all adult heights. The NHS healthy weight range starts at BMI 18.5, which would require significantly more weight at any given height. If you're at this weight, speak with your GP about whether you need nutritional support or health assessment.
How do I convert 77 pounds to stone accurately?
77 pounds equals 5.5 stone exactly (or 5 stone 7 pounds). To convert: divide pounds by 14 (since 1 stone = 14 pounds). So 77 ÷ 14 = 5.5 stone. Use our weight converter above to instantly switch between kg, stone, and pounds.
What's the healthy weight range for someone at my height?
Healthy weight depends on your height. Use our free BMI calculator above to enter your height and see your personal healthy weight range. The NHS defines healthy BMI as 18.5 to 24.9, though lower thresholds apply for some ethnic groups. Your GP can discuss what's healthy for you individually.
Why does height matter more than just weight alone?
Weight alone doesn't show health risk — height does. A 77-pound child might be perfectly healthy; a 77-pound adult is underweight. BMI combines weight and height to assess health risk. This is why the same weight can mean very different things for different people.
Should I be concerned if I weigh 77 pounds as an adult?
Yes, 77 pounds is underweight for any adult height. This may indicate malnutrition, eating disorders, or underlying health conditions. Contact your GP for assessment. They can determine whether additional support, dietary advice, or medical investigation is needed to restore healthy weight.
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.