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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17.5 Kilos in Pounds — What's Your BMI?
17.5 kilos is equivalent to 38.6 pounds (or 2 stone 10.6 lbs). However, your BMI depends on your height — the same weight gives very different BMI results for different people. This guide shows you what BMI 17.5kg produces at common UK heights, which NHS category it falls into, and whether it's in the healthy weight range. Use our free BMI calculator above to check your personal BMI instantly based on your exact height and weight.
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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.
17.5kg BMI at Different Heights
At 17.5 kilos, your BMI varies significantly depending on how tall you are. Here's what BMI this weight produces at typical UK heights:
- 5ft 0in (152cm): BMI 24.1 — healthy weight (NHS green)
- 5ft 4in (163cm): BMI 20.6 — healthy weight (NHS green)
- 5ft 8in (173cm): BMI 18.5 — healthy weight, at lower threshold (NHS green)
- 5ft 10in (178cm): BMI 17.4 — healthy weight (NHS green)
- 6ft 0in (183cm): BMI 16.4 — underweight (NHS amber)
At 17.5 kilos, most adults fall into the healthy weight range unless they are quite tall (over 5ft 10in), in which case this weight may be slightly underweight. Convert kilograms to stone using our free weight converter above to see 17.5kg in imperial measurements instantly.
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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 Healthy Ranges
The NHS defines healthy weight as a BMI between 18.5 and 24.9. At 17.5kg, you're likely in this range unless you're very tall. BMI categories are: underweight (below 18.5), healthy weight (18.5–24.9), overweight (25–29.9), and obese (30+). However, BMI has limitations — it doesn't account for muscle mass, bone density, or where fat is stored. For adults of South Asian, Chinese, Black African, or Black Caribbean heritage, the NHS recommends slightly lower thresholds due to higher health risks at lower weights. Your GP can provide personalised guidance about what your BMI means for your individual health and fitness goals.
- 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 17.5 kilos in pounds exactly?
17.5 kilos equals 38.6 pounds, or 2 stone and 10.6 pounds in UK imperial measurements. To convert kilograms to stone, divide by 6.35 — so 17.5 ÷ 6.35 = 2.76 stone.
Is 17.5kg a healthy weight?
It depends on your height. At 17.5kg, most people between 5ft 2in and 5ft 10in have a BMI in the healthy range (18.5–24.9). Taller adults may fall slightly underweight. Use our free BMI calculator to check your personal BMI.
What does BMI actually measure?
BMI measures weight relative to height. It's a screening tool used by the NHS to identify whether someone's weight may affect their health. However, it doesn't distinguish between muscle and fat, so athletes and very muscular people may have a high BMI despite being fit.
Can I use this weight information for my health decisions?
This information is educational. If you have concerns about your weight, health, or BMI, speak to your GP. They can assess your individual health, medical history, and whether any action is needed based on your circumstances.
How do I know my healthy weight range at my height?
Your healthy weight range depends on your height. Calculate it using our free BMI calculator above, or ask your GP. The NHS healthy weight range is BMI 18.5–24.9, though South Asian and some other ethnic groups have slightly lower recommendations.
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.