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 46kg in Pounds and What BMI Does It Give?
46 kilograms equals 101.4 pounds (or 7 stone 3.4 lbs in UK measurements). However, BMI—the key health indicator—depends entirely on your height. At the same weight of 46kg, a person who is 150cm tall will have a very different BMI than someone who is 180cm tall. Below, we show you what BMI this weight gives across a range of heights, and which NHS health category each falls into.
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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.
46kg BMI at Different Heights
At 46kg, your BMI varies significantly depending on height. Here are six examples:
- 150cm (4ft 11in): BMI 20.5 — healthy weight
- 155cm (5ft 1in): BMI 19.2 — healthy weight
- 160cm (5ft 3in): BMI 17.97 — healthy weight (lower end)
- 165cm (5ft 5in): BMI 16.9 — underweight
- 170cm (5ft 7in): BMI 15.9 — underweight
- 180cm (5ft 11in): BMI 14.2 — underweight
Use our free BMI calculator above to enter your exact height and see your precise BMI instantly. The weight of 46kg is relatively light for most adults—whether it is healthy depends entirely on your individual height and frame.
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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.
NHS BMI Categories and What They Mean
According to NHS guidelines, BMI categories are:
- Below 18.5: Underweight
- 18.5–24.9: Healthy weight
- 25–29.9: Overweight
- 30 and above: Obese
At 46kg, most adults will fall into either the healthy weight or underweight category depending on height. If you are under 160cm, you are likely in the healthy weight range; if you are taller, you may be underweight. BMI is a useful screening tool, but it has limits—it does not account for muscle mass or where fat is stored. Your GP can offer personalised health advice based on your individual circumstances.
- 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 46kg in pounds exactly?
46kg equals 101.4 lbs, or 7 stone and 3.4 pounds in UK measurements. Use our weight converter above to switch between kg, stone, and lbs instantly.
Is 46kg a healthy weight?
Whether 46kg is healthy depends on your height. At this weight, taller people (over 160cm) may be underweight, whilst shorter people may be in the healthy range. Use our BMI calculator above to check your personal BMI.
What does underweight mean for health?
BMI below 18.5 is classified as underweight. This may be associated with risks including reduced bone density, weaker immune function, and nutritional deficiencies. If your BMI is underweight, speak to your GP for personalised guidance.
Can I rely on BMI alone to assess my health?
BMI is a useful screening tool but has limitations. It does not distinguish between muscle and fat, and may not be accurate for very muscular people, athletes, or the elderly. Your GP can assess your health holistically alongside other measurements.
How do I know if my weight is right for me?
The best approach is to use our free BMI calculator to check your personal BMI category, then discuss your results with your GP. Weight is influenced by genetics, medical conditions, medications, and lifestyle—there is no single "ideal" weight for everyone.
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.