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 BMI Is 27 Lbs to Kg?
27 pounds equals 12.25 kilograms. However, your BMI depends entirely on your height — the same weight can be healthy, overweight, or obese depending on how tall you are. This guide shows what BMI 27 lbs gives at different heights, using NHS categories to help you understand where you fall. Use our free BMI calculator above to check your personal BMI instantly and see your health category according to current NHS guidelines.
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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.
27 Lbs (12.25 kg) BMI at Different Heights
At 27 lbs (12.25 kg), your BMI varies significantly by height. Here are typical examples using the standard metric to imperial weight conversion:
- 5ft 0in (152 cm): BMI 23.8 — Healthy weight (NHS)
- 5ft 4in (163 cm): BMI 20.7 — Healthy weight (NHS)
- 5ft 8in (173 cm): BMI 18.6 — Healthy weight (NHS)
- 5ft 10in (178 cm): BMI 17.4 — Underweight (NHS)
- 6ft 0in (183 cm): BMI 16.6 — Underweight (NHS)
These examples show why height matters. At 27 lbs, taller individuals fall into the underweight range, whilst shorter people sit comfortably in the healthy weight category. To convert 27 pounds to kilograms, simply divide 27 by 2.20462, which gives 12.25 kg. Calculate your own BMI using the calculator on this page for your specific height.
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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.
Understanding NHS BMI Categories
The NHS divides BMI into clear categories to help you understand your health risk. A BMI between 18.5 and 24.9 is considered healthy weight for most UK adults. Below 18.5 is underweight, 25–29.9 is overweight, and 30 and above is obese. However, BMI has important limitations — it doesn't distinguish between muscle and fat, so athletes may have a high BMI despite low body fat. For adults of South Asian, Chinese, Black African, or Black Caribbean heritage, the NHS recommends lower thresholds (healthy range 18.5–22.9). Your GP can provide personalised advice about what your BMI means for your individual health. Use the weight converter on this page to explore your weight across different units.
- 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 many kilograms is 27 pounds?
27 pounds equals 12.25 kilograms. To convert any weight in pounds to kg, divide the pounds figure by 2.20462. This is the standard imperial to metric conversion used in the UK and across Europe.
Is 27 lbs a healthy weight?
27 lbs (12.25 kg) is a very light weight. For most UK adults, this would be considered underweight or would only fall into the healthy BMI range if you are under 5ft tall. Your GP can advise whether this weight is appropriate for your individual height, age, and health status.
What does my BMI of 27 lbs mean?
BMI depends on height, not weight alone. At 27 lbs, you'd be underweight if you're average height or taller, but could be in the healthy range if you're shorter. Use our free BMI calculator above to enter your exact height and see your personal BMI category according to NHS guidelines.
Can I use BMI to assess my weight at 27 lbs?
Yes, but BMI has limitations. It doesn't account for muscle mass, bone density, or where fat is stored. Your waist circumference and overall fitness level also matter for health. For a full health assessment, speak with your GP rather than relying on BMI alone.
How do I convert between stone and kilograms?
To convert kilograms to stone, divide by 6.35029. To convert stone to kg, multiply by 6.35029. At 27 lbs, you're below 2 stone (2 stone = 12.7 kg). Our free weight converter on this page instantly converts between kg, stone, and pounds in all directions.
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.