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
88.9kg in Stone — BMI & Health Context
88.9 kilograms converts to 13 stone and 13.8 pounds in UK measurements. However, your BMI depends on your height — the same weight gives very different health categories depending on how tall you are. Use our free BMI calculator to find your exact BMI instantly, or check the height examples below to see where you fall on the NHS weight 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.
88.9kg BMI at Different Heights
At 88.9kg, your BMI varies significantly with height. Here are typical examples:
- 163cm (5ft 4in): BMI 33.4 — Obese (Class I)
- 168cm (5ft 6in): BMI 31.5 — Obese (Class I)
- 173cm (5ft 8in): BMI 29.7 — Overweight
- 178cm (5ft 10in): BMI 28.0 — Overweight
- 183cm (6ft 0in): BMI 26.5 — Healthy weight
- 188cm (6ft 2in): BMI 25.1 — Healthy weight
These examples show how height dramatically affects BMI classification at the same weight. Use the weight converter on this page to see your weight in other units, then calculate your personal BMI using our free BMI calculator above.
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.
NHS BMI Categories & Limitations
The NHS classifies BMI ranges for adults: below 18.5 is underweight, 18.5–24.9 is healthy weight, 25.0–29.9 is overweight, and 30.0+ is obese. However, BMI has important limitations — it doesn't distinguish between muscle and fat, so athletes or very muscular individuals may have a high BMI despite being healthy. Waist circumference and overall fitness matter too. For people of South Asian, Chinese, Black African, or Black Caribbean heritage, the NHS recommends lower BMI thresholds due to higher health risks at equivalent weights. Your GP can provide personalised advice about what your BMI means for 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 88.9kg in stone and pounds?
88.9kg converts to 13 stone and 13.8 pounds using the standard kg to stone conversion. To calculate this yourself, divide kilograms by 6.35029 to get stone, or multiply by 2.20462 to get pounds. Our free weight converter handles this instantly for any weight.
Is 88.9kg a healthy weight?
It depends on your height. At 88.9kg, someone 183cm tall would have a BMI of 26.5 (healthy), while someone 163cm tall would have a BMI of 33.4 (obese). Use our free BMI calculator to determine your personal BMI and NHS category.
How do I know if I'm overweight at this weight?
Compare your BMI to NHS guidelines using the examples above. A BMI of 25.0–29.9 is classified as overweight, while 30.0+ is obese. Your GP can also assess your health based on blood pressure, waist circumference, and medical history — BMI alone doesn't tell the full story.
Can I use metric to imperial weight conversion alone to assess health?
No — converting kilograms to stone shows your weight in UK measurements, but it doesn't indicate whether that weight is healthy for you. Height matters significantly. Always calculate your BMI using height and weight together for a complete picture.
What if I want to lose weight from 88.9kg?
The NHS recommends losing 0.5–1kg per week through a calorie deficit and increased physical activity. Even a 5–clinically studied weight loss can improve health outcomes. Your GP can discuss options including lifestyle changes, dietary support, or — if eligible — prescription weight management medication. Track your progress with our free progress tracker.
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.