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 14.1 Kg a Healthy Weight?
14.1 kilograms is equivalent to approximately 31.1 pounds. Whether this weight is healthy depends entirely on your height, age, and individual circumstances. For an adult, this weight would only fall within a healthy range if you're significantly below average height—most adults would find this weight too low. The best way to assess whether your weight is healthy is to calculate your BMI using our free BMI calculator above, which accounts for both your weight and height according to NHS guidelines.
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.
Healthy Weight Ranges by Height
At 14.1 kg (31.1 lbs), whether this weight is healthy depends on your height. Here are three realistic examples showing how height changes the picture:
- Someone 140 cm tall (4ft 7in): 14.1 kg gives a BMI of 7.2 — dangerously underweight. This would require urgent medical advice.
- Someone 165 cm tall (5ft 5in): 14.1 kg gives a BMI of 5.2 — severely underweight and incompatible with adult health.
- Someone 180 cm tall (5ft 11in): 14.1 kg gives a BMI of 4.4 — critically underweight.
For reference, the NHS healthy weight range is a BMI between 18.5 and 24.9. To convert kilograms to stone and see your personal healthy weight range, use our free weight converter above. Most adults need to weigh considerably more than 14.1 kg to be within a healthy range.
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.
What to Do If Your Weight Is Outside a Healthy Range
If you're significantly underweight—whether at 14.1 kg or another weight—this is a serious health concern that needs professional support. Contact your GP to discuss your weight, nutritional intake, and overall health. Underweight can affect bone density, immune function, energy levels, and mental health. Your GP can refer you to a registered dietitian for personalised nutrition advice and identify any underlying causes like medical conditions or eating disorders. Don't attempt to gain or lose weight without professional guidance when your BMI is outside the healthy range. Waist measurement is also important—even if your BMI were theoretically healthy, a large waist circumference (over 88 cm for women, over 102 cm for men) indicates increased health risk.
- 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 convert 14.1 kg to pounds?
14.1 kg multiplied by 2.20462 equals approximately 31.1 lbs. You can also use our free weight converter above to instantly switch between kg, stone, and pounds. The metric to imperial weight conversion is straightforward once you know the conversion factor.
Is 14.1 kg underweight for an adult?
Yes. For any adult, 14.1 kg is far below a healthy weight. An adult at this weight would have a BMI well below 18.5 (the lower threshold of healthy) regardless of height. This represents severe underweight and requires urgent medical attention from your GP.
What is the healthy weight range for my height?
Healthy weight ranges depend on your specific height. Use our free BMI calculator above to find your personal healthy weight range—it will show you the exact kg and stone figures that represent healthy, overweight, and obese categories for your height according to NHS guidelines.
What health risks come with being significantly underweight?
Underweight can affect bone strength, immune function, fertility, mental health, and energy. If you're well below the healthy weight range, your GP can assess underlying causes—whether nutritional, medical, or related to eating disorders—and provide appropriate support.
Should I try to gain weight to 14.1 kg or above?
If you're currently below a healthy weight, yes—but this must be done safely with professional guidance from your GP or a registered dietitian. They can create a personalised nutrition plan and monitor your progress to ensure you're gaining weight healthily and addressing any underlying issues.
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.