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 14.9 kg in stone?
14.9 kilograms is equal to 2 stone and 5.1 pounds (2 st 5.1 lbs). If you need to convert kilograms to stone using the standard kg to stone conversion formula, simply divide your weight in kilograms by 6.35029. This conversion is particularly useful in the UK where weight in stone and pounds remains the most common way to describe body weight, even though the NHS uses kilograms for clinical measurements. Use our free weight converter above to switch between metric and imperial measurements instantly.
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.
Conversion Reference Table
Here are nearby weight values converted from kilograms to stone and pounds, so you can see how 14.9 kg compares to similar weights:
- 12.9 kg = 2 st 0.3 lbs
- 13.4 kg = 2 st 2.7 lbs
- 13.9 kg = 2 st 4.9 lbs
- 14.9 kg = 2 st 5.1 lbs (your weight)
- 15.4 kg = 2 st 7.5 lbs
- 15.9 kg = 2 st 9.7 lbs
- 16.4 kg = 2 st 12 lbs
To convert any kilogram to stone and pounds, divide kilograms by 6.35029 to get stone, then multiply the decimal portion by 14 to get pounds. The MyWeightCheck weight converter above makes this instant and accurate.
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.
Healthy Weight Context at 14.9 kg
At 14.9 kg (2 st 5.1 lbs), understanding your BMI requires knowing your height, since weight alone doesn't determine health. For example, at an average UK female height of 163 cm (5 ft 4 in), a weight of 14.9 kg would result in a BMI of 5.6, which is significantly underweight and would require medical evaluation. At an average UK male height of 175 cm (5 ft 9 in), the same weight gives a BMI of 4.9, also considerably underweight. Use our free BMI calculator on this page to enter your exact height and see your personal BMI category according to NHS guidelines. If you fall in the underweight range, speaking with your GP is advisable.
- 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 14.9 kg to stone and pounds manually?
Divide 14.9 by 6.35029 to get stone (2.35 st). Multiply the decimal (0.35) by 14 to get pounds (5.1 lbs). Result: 2 stone 5.1 pounds. Our free weight converter does this instantly if you prefer not to calculate it yourself.
Is 14.9 kg a healthy weight for an adult?
At 14.9 kg alone, this is very light for any adult, and BMI depends entirely on height. Most UK adults weigh significantly more. Use our BMI calculator above with your height to determine your personal BMI category and discuss any concerns with your GP.
What's the difference between stone, pounds, and kilograms?
These are three weight units. One stone equals 6.35 kg or 14 pounds. Kilograms are metric (used by the NHS clinically). Stone and pounds are imperial (traditional UK measurements). All three express the same weight in different units.
Why does the UK use stone and pounds instead of kilograms?
Historically, the UK adopted imperial measurements, and stone and pounds remain culturally embedded in everyday conversation about weight. The NHS uses kilograms for medical records, but most UK adults still think and speak about their weight in stone and pounds.
Can I use this conversion for children's weight?
This conversion works for any weight value, but BMI categories for children are different from adults and use age and sex-specific charts. Always consult the NHS Healthy Weight Calculator for children, or speak with your GP about a child's weight.
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.