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 89kg in Stone and What's the BMI?
89kg converts to 14 stone and 0.6 pounds — a weight that falls into different NHS BMI categories depending on your height. Your BMI at this weight ranges from overweight to obese according to NHS guidelines, but the exact category depends entirely on how tall you are. Use our free BMI calculator above to find your personal BMI instantly, or read on to see where 89kg sits at different heights across the UK health spectrum.
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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.
89kg BMI at Different Heights
At 89kg, your BMI varies significantly based on height. Here are typical examples across common UK heights:
- 160cm (5ft 3in): BMI 34.8 — Obese (Class I)
- 168cm (5ft 6in): BMI 31.6 — Obese (Class I)
- 175cm (5ft 9in): BMI 29.1 — Overweight
- 180cm (5ft 11in): BMI 27.5 — Overweight
- 185cm (6ft 1in): BMI 26.0 — Overweight
- 190cm (6ft 3in): BMI 24.6 — Healthy weight
At this weight, taller individuals may fall within the healthy range, whilst shorter adults are more likely to be in the overweight or obese categories. Convert your exact weight using our free weight converter to find your precise stone and pounds measurement.
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.
NHS BMI Categories and Health Context
The NHS uses five BMI categories for adults. A BMI under 18.5 is underweight, 18.5–24.9 is healthy weight, 25–29.9 is overweight, 30–34.9 is obese Class I, and 35+ is obese Class II or higher. At 89kg, most people fall into overweight or obese ranges depending on height.
Important: BMI is a screening tool, not a diagnosis. It does not account for muscle mass, bone density, or where fat is stored. An athlete with significant muscle may have a high BMI but low body fat. For personalised health advice about what your weight means for you, consult your GP who can assess your individual health picture.
- 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.
How do I convert 89kg to stone and pounds?
Divide 89kg by 6.35029 to get stone (14.03 stone), then multiply the decimal (0.03) by 14 to get pounds (0.6lbs). So 89kg = 14 stone 0.6lbs. Use our weight converter above for instant conversions between kilogram to stone and other units.
Is 89kg overweight or obese?
At 89kg, whether you're overweight or obese depends on your height. Shorter individuals (under 175cm) are likely in the obese category, whilst taller people may be overweight or even in the healthy range. Use our BMI calculator to find your exact category based on your height.
What's the healthy weight range at my height if I weigh 89kg?
Healthy weight depends on height. At 175cm, healthy weight is roughly 55–76kg. At 185cm, it's 63–86kg. At 165cm, it's 50–67kg. Your GP or our BMI calculator can show your personalised healthy weight range based on your specific height.
Does 89kg mean I need to lose weight?
Whether weight loss is advisable depends on your individual health, height, medical history, and other factors — not weight alone. Your GP can assess whether weight loss would benefit your health. Even modest weight loss of 5–10% can improve blood pressure and blood sugar control.
Can I use BMI to track my progress?
Yes, BMI is useful for tracking health progress over time alongside other measures like how you feel and your energy levels. You can log your weight, height, and BMI using our free progress tracker to monitor changes and see trends in your health journey.
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.