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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138 Kg In Lbs — Exact Conversion & Health Context
138 kilograms is equal to 304.2 pounds (lbs). If you prefer UK measurements, that's approximately 21 stone 10 pounds. Whether you're tracking your weight for health reasons, preparing for a medical appointment with your GP, or simply curious about unit conversions, understanding your weight across different measurement systems is useful. Our free weight converter above lets you switch between kg, stone, and lbs instantly, and we've included BMI context at average UK heights to help you understand what this weight means for your health.
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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.
138 Kg To Lbs Conversion Table & Formula
138 kg = 304.2 lbs (or 21 stone 10 lbs in UK measurements).
To convert kilograms to pounds, multiply by 2.20462. The formula is: kg × 2.20462 = lbs. For 138 kg: 138 × 2.20462 = 304.24 lbs.
Here's a reference table showing weights near 138 kg for quick comparison:
- 135 kg = 297.6 lbs (21st 3.6lbs)
- 136 kg = 299.9 lbs (21st 5.9lbs)
- 138 kg = 304.2 lbs (21st 10lbs)
- 140 kg = 308.6 lbs (22st 0.6lbs)
- 142 kg = 313.0 lbs (22st 4.9lbs)
You can also convert this weight to stone using the metric to imperial weight conversion: 138 kg ÷ 6.35029 = 21.73 stone.
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.
BMI Context & Healthy Weight At 138 Kg
At 138 kg, your BMI depends entirely on your height. For example, at an average UK adult height of 175 cm (5ft 9in), a weight of 138 kg gives a BMI of approximately 45.1, which falls in the severely obese category (BMI 40+) according to NHS guidelines. At 165 cm (5ft 5in), the BMI would be around 50.6. A healthy BMI is 18.5–24.9. The healthy weight range for someone 175 cm tall is approximately 56–76 kg; for someone 165 cm tall, it's 50–68 kg. Use our free BMI calculator above to check your personal BMI and healthy weight range based on your actual height. If you're considering weight management options, your GP can discuss evidence-based approaches tailored to your individual health.
- 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 138 kg in stones and pounds?
138 kg equals 21 stone and 10 pounds in UK measurements. To convert any weight from kg to stone, divide by 6.35029. For 138 kg: 138 ÷ 6.35029 = 21.73 stone, which is 21 stone (whole number) plus 0.73 × 14 pounds = 10.2 pounds.
How do I convert 138 kg to pounds?
Multiply 138 by 2.20462. The answer is 304.2 pounds. This formula works for any kilogram value: simply multiply the kg amount by 2.20462 to get the equivalent in pounds.
Is 138 kg overweight?
Whether 138 kg is overweight depends on your height. At average UK heights (165–180 cm), 138 kg typically falls in the obese or severely obese BMI category. Your GP can assess this individually and discuss health options with you.
What is the healthy weight range if I'm 175 cm tall and weigh 138 kg?
For someone 175 cm tall, the healthy BMI range (18.5–24.9) corresponds to approximately 56–76 kg. At 138 kg, your BMI is around 45, well above the healthy range. Your GP can discuss realistic, sustainable weight loss approaches.
Can I use a weight converter to check other measurements?
Yes. Our free weight converter on this page lets you convert between kilograms, stone, and pounds instantly. Simply enter any weight value and the tool will show all three units, making it easy to switch between metric and imperial measurements.
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.