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 the Average Weight for a Female 5'1"?
For a female who is 5'1" (155cm) tall, the average UK weight is approximately 65–70kg (10st 3lbs to 11st). However, healthy weight varies significantly between individuals depending on muscle mass, frame size, and overall health. According to NHS guidelines, a healthy weight range for this height is approximately 46–62kg (7st 3lbs to 9st 11lbs). Use our free BMI calculator above to check where your personal weight sits and what it means for your individual health.
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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 and BMI for 5'1"
For an adult female who is 5'1" (155cm), the healthy weight range according to NHS guidelines is approximately 46–62kg (7st 3lbs to 9st 11lbs), which corresponds to a BMI of 18.5 to 24.9. This range is based on standard adult BMI thresholds. However, if you are of South Asian, Chinese, Black African, or Black Caribbean heritage, the NHS recommends slightly lower thresholds — your ideal weight range may be approximately 43–57kg (6st 12lbs to 8st 13lbs).
At this height, a weight of 65kg (10st 3lbs) gives a BMI of approximately 27, which falls into the overweight category. A weight of 70kg (11st) corresponds to a BMI of approximately 29.2, still in the overweight range. Our weight converter can help you check conversions between kg, stone, and pounds instantly.
- BMI below 18.5 = underweight
- BMI 18.5–24.9 = healthy weight
- BMI 25–29.9 = overweight
- BMI 30+ = obese
Clinically BackedWeight Loss
No appointments. No waiting rooms. Just care — from a UK-regulated online pharmacy.
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 Ideal Weight at This Height
Ideal body weight isn't just about a single number on the scales — it depends on several individual factors. Muscle mass is crucial: muscle weighs more than fat, so two people at the same height and weight can look very different. Frame size also matters — someone with a larger frame naturally carries more weight healthily than someone with a smaller frame. Age affects weight distribution and metabolism; older adults may naturally carry slightly more weight. Ethnicity influences health risk at different BMI levels, which is why the NHS recommends adjusted thresholds for certain groups.
Rather than aiming for a single "ideal" number, focus on how you feel, your energy levels, and your health markers (blood pressure, blood sugar, cholesterol). A healthy weight calculator like the NHS tool, combined with our free BMI calculator above, can help you identify your personal healthy weight range rather than pursuing a generic average.
- 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 the healthy weight range for a 5'1" woman?
According to NHS guidelines, the healthy weight range for a 5'1" (155cm) female is approximately 46–62kg (7st 3lbs to 9st 11lbs), corresponding to a BMI of 18.5–24.9. If you are of South Asian, Black African, or Black Caribbean heritage, the NHS recommends lower thresholds: approximately 43–57kg (6st 12lbs to 8st 13lbs).
What is the average weight for UK women who are 5'1"?
The average UK adult woman weighs approximately 71.6kg (11st 3lbs) regardless of height. However, this is an average across all heights and body types, not a target weight. For someone specifically 5'1", the average may be slightly lower at around 65–70kg (10st 3lbs to 11st).
Is 70kg overweight for a 5'1" woman?
At 5'1", a weight of 70kg (11st) gives a BMI of approximately 29.2, which falls into the overweight category according to NHS guidelines. However, BMI doesn't account for muscle mass, so consult your GP if you're concerned about your individual health rather than relying on BMI alone.
How can I calculate my healthy weight at my height?
Use the NHS healthy weight calculator or our free BMI calculator above to find your personal healthy range. Alternatively, for a rough estimate: healthy BMI is 18.5–24.9, so multiply your height in metres squared by these numbers. For example, at 1.55m: 18.5 × (1.55)² = 44.5kg minimum; 24.9 × (1.55)² = 59.7kg maximum.
Does muscle mass affect ideal weight at this height?
Yes, significantly. Muscle weighs more than fat, so two people at the same height and weight can have very different body compositions. Athletes or very active individuals may have a higher healthy weight than sedentary people at the same height. Focus on fitness, energy levels, and health markers rather than a single target weight number.
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.