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 the Average Weight for a 10-Year-Old Girl?
The average weight for a 10-year-old girl in the UK is approximately 32–36 kg, though this varies significantly based on height, genetics, and development stage. NHS growth charts are the gold standard for monitoring children's weight in the UK, using age and sex-specific centile curves rather than adult BMI categories. If you're concerned about your child's weight or growth, your GP can provide personalised NHS health advice and check whether your daughter is growing healthily for her age.
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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.
UK Growth Charts and Healthy Weight Ranges
The NHS uses the UK90 growth reference charts to track children's weight and height from birth through adulthood. These charts show centile lines — your child's position relative to other children of the same age and sex.
- Between 2nd and 91st centile: Generally considered healthy growth
- Below 2nd centile: May indicate underweight or growth concerns
- Above 91st centile: May indicate overweight
- Above 98th centile: May indicate very overweight or obesity
A 10-year-old girl at the 50th centile (the middle) would typically weigh around 32–34 kg, depending on her exact height. However, centile position matters more than any single number — healthy growth follows a consistent curve, not reaching a particular target weight.
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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.
When to Talk to Your GP About Your Child's Weight
If your daughter's weight has jumped significantly between growth chart centiles, or if you have concerns about her eating, energy levels, or physical development, speak to your GP. They can assess whether her weight gain is appropriate for her age and height using NHS growth charts, and rule out any underlying health conditions.
Weight management in children is different from adults — it's not usually about losing weight, but ensuring steady, appropriate growth. Your GP may refer you to a specialist NHS paediatric weight management service if needed, or provide nhs health guidance on supporting balanced eating and activity patterns.
- 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.
Is 36 kg heavy for a 10-year-old girl?
At 36 kg, it depends entirely on your daughter's height and growth pattern. Use the NHS UK90 growth charts to find her centile position — this is more important than any single weight number. If she's growing steadily and healthily along her own centile line, this is normal. Your GP can interpret her growth chart accurately.
What's the healthy weight range for a 10-year-old girl?
Healthy weight for 10-year-old girls typically ranges from 28–42 kg depending on height and genetics. However, individual healthy ranges vary enormously. The NHS growth chart is the definitive tool — it shows whether your child is in a healthy centile range (2nd to 91st centile) for her age and height.
Should I use a BMI calculator for my 10-year-old?
No — adult BMI categories do not apply to children. Children's weight assessment uses age and sex-specific centile charts, not adult BMI formulas. Always use the NHS UK90 growth reference charts or ask your GP to assess your child's growth. Never use adult weight calculators for children.
At what weight should I be concerned about my 10-year-old's health?
Don't focus on a specific weight number. Instead, watch for changes in growth pattern — if your child's weight suddenly jumps centiles or stops growing steadily, speak to your GP. Also consider activity levels, diet quality, and overall wellbeing. Your GP can assess using NHS growth charts and provide personalised guidance.
How can I support healthy weight in my 10-year-old?
Focus on healthy habits: regular family physical activity, balanced meals with plenty of vegetables and water, limited sugary drinks, and consistent sleep. Avoid restrictive diets or weight talk. If you're worried about her eating or development, your GP or a registered dietitian can offer NHS health advice tailored to your family.
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.