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
What is 5.9 pounds in kilograms?
5.9 pounds is equal to approximately 2.68 kilograms. If you need to convert between imperial and metric weight measurements, this straightforward conversion helps you understand weights in both systems. Whether you're tracking a small weight change, following a recipe, or monitoring health metrics, knowing how to convert pounds to kilograms is useful. Use our free weight converter above to switch between kg, stone, and lbs instantly for any value.
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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.
Conversion Formula and Reference Table
To convert pounds to kilograms, divide the pound value by 2.20462. The formula is: weight in lbs ÷ 2.20462 = weight in kg. For 5.9 pounds: 5.9 ÷ 2.20462 = 2.676 kg (rounded to 2.68 kg).
Here's a reference table showing nearby conversions:
- 5.0 lbs = 2.27 kg
- 5.5 lbs = 2.49 kg
- 5.9 lbs = 2.68 kg
- 6.5 lbs = 2.95 kg
- 7.0 lbs = 3.18 kg
This conversion works the same way whether you're converting stone and pounds or individual pound measurements. The kilogram to stone conversion uses the same principle but with different divisors.
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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 and Healthy Weight Context
At 2.68 kg, this weight is extremely low for an adult and would not typically appear in UK health assessments. For context, healthy weight ranges vary significantly by height. For example, someone 1.63 metres tall (5 feet 4 inches) with a healthy BMI would weigh between approximately 49 and 66 kg. Small weight changes of a few kilograms are often tracked during weight loss or medical monitoring. Use our free BMI calculator to check what a healthy weight range is for your specific height, and our weight converter to track changes across both metric and imperial units.
- 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.
Why convert pounds to kilograms?
The UK uses both metric (kg) and imperial (stone and pounds) measurements. Kilograms are standard in medical settings, nutrition labels from Europe, and scientific contexts. Converting between systems helps you understand weight information consistently, whether tracking health changes or comparing measurements internationally.
Is 2.68 kg a healthy weight for an adult?
No, 2.68 kg is far too low for any adult. Healthy adult weights range from approximately 50 kg to 150 kg depending on height. This tiny weight might describe a newborn infant or a specific body part. Always check your height-specific healthy weight range using the BMI calculator on this page.
How accurate is the pounds to kg conversion?
The standard conversion (1 lb = 0.453592 kg) is precise for all practical purposes. Most calculators round to 2–3 decimal places, which is accurate enough for health, cooking, and everyday use. For scientific work, use more decimal places.
Can I use this conversion for weight loss tracking?
Yes. If you're tracking weight loss in pounds but your GP uses kilograms, convert using this formula to compare measurements consistently. Our free progress tracker lets you log weight in either unit and track trends over time automatically.
What's the difference between kg and stone measurements?
Kilograms (kg) are metric units; stone is imperial (UK traditional). One stone equals 6.35 kg. The UK often uses stone and pounds together (e.g., "11 stone 7 pounds"). For weight loss plans and NHS measurements, kg is standard, but many UK adults prefer stone for everyday use.
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.