The calculators on FitMathHub give estimates from published mathematical formulas. They are for general information and education only and do not provide medical advice, diagnosis or treatment.
What the results are
- Every result is an estimate. The formulas were fitted on groups of people, and any one person can sit well above or below the estimate.
- Reference values (such as BMI classes, protein or water benchmarks) describe population averages and ranges. They are not personal targets.
- Each calculator shows its formula, a worked example and its sources so you can see exactly how a number was produced.
Who the formulas are not made for
The formulas were developed in healthy adults. They are not made for children or teenagers, pregnancy or breastfeeding, people with a medical condition (for example heart, kidney or metabolic disease, or an eating disorder), or people taking medication that changes heart rate, appetite or fluid balance. In those cases, ask a doctor or registered dietitian.
Before you act on a number
Don't use a result to start, stop or change a diet, training plan or treatment without talking to a qualified health professional, especially if you have a health condition. If you feel unwell during exercise, stop and seek medical help.
No guarantee
The calculators and texts are checked carefully and tested, but they are provided "as is", without a guarantee that they are complete, current or free of errors. If you find a mistake, please report it through the contact form.