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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Average Weight for 5'1" Females in the UK
At 5'1" (155cm), the average UK female weighs approximately 71.6 kg (11 stone 3 lbs), though individual weight varies significantly based on muscle mass, bone density, and genetics. The healthy weight range for this height is approximately 47–63 kg (7 stone 5 lbs to 9 stone 13 lbs) according to NHS BMI guidelines. This guide explains what healthy weight means, how it's calculated, and how individual factors affect your ideal body weight.
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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.
Healthy Weight Range for 5'1" (155cm)
For a female of 5'1" (155cm), the NHS healthy weight range is approximately 47–63 kg or 7 stone 5 lbs to 9 stone 13 lbs. This is based on a BMI of 18.5–24.9, which the NHS considers the healthy range for adults.
To calculate this range: a healthy BMI of 18.5 × (1.55)² = 47 kg, and 24.9 × (1.55)² = 63 kg. At 5'1", if you fall within this range, your weight is considered healthy from a BMI perspective. Use our free BMI calculator above to find your personal BMI instantly and see where you fall against NHS guidelines.
If your current weight is above 63 kg, it's worth discussing with your GP what a realistic, sustainable weight loss target might be for your individual health circumstances.
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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.
Factors That Affect Your Ideal Weight
Ideal body weight isn't one-size-fits-all. Several factors influence what's healthy for you personally: muscle mass (muscle is denser than fat, so athletic individuals may weigh more), bone density (naturally varies between people), age (metabolism changes over time), and ethnicity. For women of South Asian, Chinese, Black African, or Black Caribbean heritage, the NHS recommends lower BMI thresholds—a healthy weight range might start lower. Frame size also matters; a larger frame naturally carries more healthy weight. Rather than targeting a specific number, focus on how you feel, your energy levels, and what your GP recommends for your individual health profile.
- 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's the healthy weight range for a 5'1" female in the UK?
According to NHS guidelines, the healthy weight range for a 5'1" female is approximately 47–63 kg (7 stone 5 lbs to 9 stone 13 lbs), based on a BMI of 18.5–24.9. This range is a general guide; your personal healthy weight depends on muscle mass, bone density, and other individual factors. Use our free BMI calculator to check your personal BMI.
Is 70 kg overweight for a 5'1" female?
Yes, at 5'1" a weight of 70 kg (11 stone) gives a BMI of approximately 28.6, which falls into the overweight category according to NHS guidelines (BMI 25–29.9). This doesn't mean you're unhealthy, but it may be worth discussing with your GP if you have weight-related health concerns.
What's the average weight of UK females?
The average UK adult female weighs approximately 71.6 kg (11 stone 3 lbs) and is approximately 161.6 cm (5'3.5") tall, giving an average BMI of around 27.4. However, average doesn't equal ideal—many UK women fall above the NHS healthy weight range, which is why weight management is an important health topic.
How do I calculate my ideal weight at 5'1"?
Ideal weight can be calculated using the Devine Formula: 45.5 kg + 2.3 kg per inch over 5 feet. For 5'1", that's 45.5 + (2.3 × 1) = 47.8 kg. However, this is just a reference—your ideal weight also depends on muscle mass and frame size. Our BMI calculator and weight converter can help you understand your weight in health context.
Should I aim for the average weight or the healthy range?
Aim for the healthy weight range (47–63 kg at 5'1"), not the average weight. The average includes many people above the healthy range. A healthier target is one that puts you in the NHS healthy BMI zone (18.5–24.9) and that you can sustain long-term. Your GP can help you set a realistic, personalised goal based on your health profile.
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.