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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Is 71kg a Healthy Weight? Convert to Stones and Check Your Range
At 71kg, your weight in stones is 11 stone and 2 pounds (11st 2lbs). Whether this is a healthy weight depends entirely on your height. For someone 5ft 6in tall, 71kg falls within the healthy range. But for a shorter adult, it might indicate overweight status, while for a taller person it could be below the healthy range. The NHS uses BMI calculated from both weight and height to determine if a weight is healthy. Use our free BMI calculator above to check your personal BMI instantly and see where you fall on the NHS health 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.
Healthy Weight Ranges at Different Heights
Since 71kg is a fixed weight, where it sits on the NHS healthy scale depends on your height. Here's how 71kg converts to different BMI categories at three common adult heights:
- At 5ft 2in (158cm): 71kg gives a BMI of 26.9 — this is overweight (healthy range would be 46–61kg)
- At 5ft 6in (168cm): 71kg gives a BMI of 23.2 — this is healthy weight (healthy range is 51–69kg)
- At 5ft 10in (178cm): 71kg gives a BMI of 22.4 — this is healthy weight (healthy range is 55–74kg)
To convert kilograms to stone accurately for your own height, use the weight converter on this page. According to NHS guidelines, a healthy BMI range is 18.5 to 24.9. Below that is underweight; 25.0–29.9 is overweight; 30 and above is obese.
Clinically BackedWeight Loss
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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.
What to Do If You're Outside the Healthy Range
If your BMI falls outside the healthy 18.5–24.9 range, the NHS recommends speaking to your GP. They can assess your individual health context, as BMI doesn't account for muscle mass or where fat is stored. Even a modest weight loss of 5–10% can improve blood pressure, blood sugar control, and overall health. If you're overweight, aiming to lose around 0.5kg per week is sustainable and realistic. If you're underweight, gaining weight gradually with nutritious foods and possibly a referral to a dietitian is appropriate. Waist measurement is also important: men should aim for under 94cm (37in), women under 80cm (31.5in). Track your progress with our free progress tracker to monitor changes over time.
- 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 71kg in stones and pounds?
71kg equals 11 stone and 2 pounds (11st 2lbs). To convert kilograms to stone, divide the kilogram amount by 6.35. Our free weight converter above can instantly calculate this in both metric and imperial units.
Is 71kg a healthy weight for all heights?
No. A weight of 71kg is healthy for some heights but not others. At 5ft 6in it's healthy (BMI 23.2), but at 5ft 2in it's overweight (BMI 26.9). Use our free BMI calculator to check your personal healthy range based on your height and age.
What's the healthy weight range for my height?
Healthy BMI is 18.5–24.9 according to NHS guidelines. To find your healthy weight range, multiply 18.5 by your height in metres squared (for the lower bound) and 24.9 by the same figure (for the upper bound). Your GP can also advise based on your individual health context.
Does BMI tell the whole story about weight and health?
BMI is a useful screening tool but has limitations. It doesn't distinguish between muscle and fat, so athletes may have a high BMI but low body fat. Waist measurement is also important: men should aim for under 94cm, women under 80cm. Speak to your GP for personalised advice.
What should I do if I want to lose weight?
If you're above a healthy BMI, aim to lose 0.5–1kg per week through a combination of reduced-calorie diet and increased physical activity. Speak to your GP first, especially if you have existing health conditions. They can discuss options including weight loss support programmes or, if appropriate, prescription treatment.
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.