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
Free tracker included with every download this week
Is 7 Stone Underweight — What NHS Guidelines Say
Whether 7 stone is underweight depends entirely on your height and age. Using NHS guidance, 7 stone (approximately 44.5 kg) is considered underweight for most adults, though very short adults may fall within a healthy weight range at this level. Our free BMI calculator can help you check whether 7 stone is underweight for your specific height and build. If you're concerned about being underweight or losing weight unintentionally, speaking with your GP is important to rule out underlying health issues and get personalised UK health advice.
10,000+ calculations today · NHS-aligned thresholds · 100% free
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.
NHS BMI Categories and 7 Stone Weight
According to NHS guidelines, a healthy BMI for most adults is between 18.5 and 24.9. At 7 stone (44.5 kg), your BMI status depends on your height:
- For someone 5ft 2in (157 cm) tall, 7 stone gives a BMI of around 18.1 — just below the healthy range (underweight)
- For someone 5ft 0in (152 cm) tall, 7 stone gives a BMI of around 19.3 — within the healthy range
- For taller adults, 7 stone would result in a significantly lower BMI, indicating underweight status
Use our free weight converter above to switch between stone, kg, and lbs, then calculate your personal BMI using the BMI calculator on this page. Being underweight (BMI below 18.5) can affect bone density, immune function, and energy levels — making GP advice valuable if this applies to you.
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.
UK Health Guidance When Underweight
If you're underweight, the NHS recommends discussing this with your GP to identify any underlying causes — such as metabolic conditions, nutrient deficiencies, or unintentional weight loss patterns. Being underweight may increase the risk of weak bones, poor wound healing, and infections. Your GP can offer personalised UK health advice and may refer you to a dietitian for support with nutrition and healthy weight gain. Monitoring your weight using our free progress tracker can help you and your healthcare team track changes over time and ensure you're moving toward a healthier weight range for your height.
- 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.
How do I know if 7 stone is underweight for me?
Calculate your BMI using the free BMI calculator on this page. Enter your height and weight (7 stone = 44.5 kg). If your BMI is below 18.5, you're underweight according to NHS guidelines. However, BMI doesn't account for muscle mass, so discuss your results with your GP for personalised health advice.
What is 7 stone in kg and lbs?
7 stone equals approximately 44.5 kg or 98 lbs. Use our free weight converter above to switch between metric and imperial measurements instantly. This makes it easier to compare your weight against NHS health guidelines and BMI charts.
Should I be concerned if I'm 7 stone?
Being 7 stone isn't inherently concerning — it depends on your height, age, and overall health. However, if you're underweight (BMI below 18.5) or losing weight unintentionally, speak with your GP. Underweight status can affect bone health, immunity, and energy levels, so professional guidance is valuable.
What should my healthy weight be?
Your healthy weight range depends on your height. Use the BMI calculator on this page to find the weight range that gives a BMI between 18.5 and 24.9 for your specific height. For example, at 5ft 4in, a healthy weight range is roughly 101–137 lbs (46–62 kg). Your GP can provide personalised guidance.
Can I trust BMI to determine if I'm underweight?
BMI is a useful NHS screening tool but has limitations — it doesn't distinguish between muscle and fat, and doesn't account for bone density or frame size. If you're 7 stone and concerned about your weight status, BMI is a good starting point, but always discuss results with your GP for complete health assessment.
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.