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 Calcium-Phosphorus Ratio?
The calcium-phosphorus ratio is the balance between two essential minerals in your body that work together to maintain bone strength, muscle function, and overall health. Both calcium and phosphorus are critical for bone mineralisation, but your body needs them in the right proportion—ideally around 1:1 to 2:1 (calcium to phosphorus). According to NHS guidance, getting the correct balance supports healthy weight management, bone density, and metabolic function, which is why understanding this ratio matters for your long-term health.
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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.
How the Calcium-Phosphorus Ratio Works
Calcium and phosphorus are both minerals essential for bone formation and maintenance. When your calcium-to-phosphorus ratio is balanced, these minerals work synergistically: calcium provides structural strength to bones, whilst phosphorus helps your body absorb and utilise calcium effectively. Phosphorus also plays a role in energy production and cell repair.
An imbalanced ratio—particularly too much phosphorus relative to calcium—can interfere with calcium absorption and potentially weaken bones over time. The NHS recommends that adults aged 19–50 consume 700 mg of calcium daily and approximately 550 mg of phosphorus daily, maintaining a balanced intake of both.
- Calcium supports bone density and muscle contraction
- Phosphorus aids energy metabolism and calcium regulation
- The body absorbs calcium more efficiently when the ratio is optimal
- Vitamin D is essential for both minerals to function effectively
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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.
Building a Balanced Diet for Bone Health
Meeting your calcium and phosphorus needs through a balanced diet is the foundation of healthy weight management and bone strength. Calcium-rich foods include dairy products, leafy greens, fortified plant-based milks, and tinned fish with bones. Phosphorus is naturally present in most proteins—meat, fish, eggs, legumes, and nuts—so deficiency is rare in the UK.
To maintain a healthy calcium-phosphorus ratio, focus on whole foods and limit processed foods, which often contain excess phosphorus as additives. Pair calcium sources with vitamin D-rich foods (fatty fish, egg yolks) and ensure regular physical activity, which strengthens bones alongside good nutrition. If you're following a weight loss plan using our free BMI calculator or weight management guidance, ensure your reduced-calorie diet still includes adequate calcium sources to protect bone health during weight loss.
- 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 an ideal calcium-phosphorus ratio?
The ideal ratio is approximately 1:1 to 2:1 (calcium to phosphorus). The NHS recommends 700 mg calcium and 550 mg phosphorus daily for UK adults aged 19–50. This balance supports bone strength, calcium absorption, and metabolic health.
Can an imbalanced ratio affect weight management?
Yes. Research suggests that adequate calcium intake may support healthy weight management as part of a balanced diet. An imbalanced ratio affecting calcium absorption could potentially interfere with metabolic function, so maintaining proper mineral balance is part of overall health.
Which foods are best for calcium-phosphorus balance?
Calcium sources include dairy (milk, yoghurt, cheese), leafy greens (kale, broccoli), fortified plant milks, and tinned fish with bones. Phosphorus is naturally abundant in proteins. Focus on whole foods and limit processed items that contain excess phosphorus additives.
How does vitamin D fit into this ratio?
Vitamin D is essential for both calcium and phosphorus absorption. Without adequate vitamin D, your body cannot effectively utilise calcium even if intake is sufficient. The NHS advises vitamin D supplementation (10 µg daily) for most UK adults, particularly October to March.
Should I use a calcium supplement?
Most UK adults can meet calcium needs through food. However, those with dairy allergies, vegans, or those following restrictive diets may benefit from supplementation. Consult your GP before starting any supplement to ensure it's appropriate for your individual health needs.
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.