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
87 Kilos to Stones — Healthy Weight Guide
87 kilograms equals 13 stone and 10 pounds (13st 10lbs) in UK measurements. Whether this weight is healthy for you depends entirely on your height, age, and overall health. The NHS uses BMI (body mass index) as a screening tool to assess whether weight falls into a healthy range. Use our free BMI calculator above to check your personal BMI instantly — it takes just a few seconds and gives you immediate context about your weight status.
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.
Healthy Weight Ranges at Different Heights
At 87kg, your weight may be healthy, overweight, or obese depending on your height. The NHS healthy weight range is a BMI of 18.5 to 24.9. Here's how 87kg compares at common heights:
- 5ft 4in (163cm): BMI 36.7 — falls in the obese category
- 5ft 7in (170cm): BMI 30.5 — falls in the obese category
- 5ft 10in (178cm): BMI 26.3 — falls in the overweight category
- 6ft 0in (183cm): BMI 24.4 — falls in the healthy weight range
For adults of South Asian, Chinese, Black African, or Black Caribbean heritage, the NHS recommends lower BMI thresholds, so healthy ranges begin at BMI 18.5 to 22.9. To convert kilograms to stone accurately and check your personal BMI, use our free weight converter and BMI calculator on this page.
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.
What to Do If You're Outside the Healthy Range
If your BMI sits outside the healthy range, there are evidence-based steps you can take. The NHS recommends aiming for sustainable weight loss of 0.5 to 1 kg per week through a combination of reduced-calorie eating and increased physical activity. Even a 5% reduction in body weight can significantly improve health markers like blood pressure and blood sugar control.
If you're concerned about your weight or have any health conditions, speak with your GP. They can discuss your individual circumstances, including whether lifestyle changes alone would help, or whether additional support such as a structured weight management programme might be appropriate. Your GP can also check your waist measurement — a key health indicator alongside weight.
- 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 87kg in stones and pounds?
87 kilograms equals 13 stone and 10 pounds (13st 10lbs). To convert kilograms to stone, divide by 6.35. Use our free weight converter above to instantly switch between metric and imperial measurements.
Is 87kg a healthy weight?
It depends on your height. At 5ft 10in (178cm), 87kg gives a BMI of 26.3 (overweight). At 6ft 0in (183cm), it's a BMI of 24.4 (healthy). Use our BMI calculator above to find out your personal BMI and healthy weight range.
What is the NHS healthy weight range?
According to NHS guidelines, a healthy BMI is between 18.5 and 24.9. For South Asian, Chinese, Black African, or Black Caribbean adults, the healthy range starts at 18.5 and goes to 22.9 due to higher health risks at lower BMI levels.
What should I do if my BMI is above 25?
The NHS recommends sustainable weight loss of 0.5 to 1 kg per week through a balanced diet and increased physical activity. Even losing 5% of your body weight can improve health. Speak with your GP if you'd like personalised advice or support.
Does waist measurement matter as much as weight?
Yes. Waist circumference is an important health indicator alongside weight. The NHS advises caution if your waist is over 80cm (31.5in) for women or 94cm (37in) for men. Your GP can assess both measurements together.
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.