Clinical Calculators

Links to clinical calculators commonly used in primary care.

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Enter height and weight to calculate body mass index (BMI).

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BSA (Mosteller formula)

Enter height and weight to calculate body surface area (BSA).

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Creatinine clearance (Cockcroft -Gault equation) 

Enter age and serum creatinine
level to calculate creatinine clearance.

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Estimated GFR (MDRD equation)

Enter age and serum creatinine level to calculate estimated glomerular filtration rate (eGFR).

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Pregnancy due date

Enter the date of last period to calculate expected delivery date and number of weeks' gestation.

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Baby age

Enter a baby's date of birth to calculate his or her age in weeks.

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Cardiovascular risk (JBS3)

Enter details of patient's risk factors to calculate the risk of cardiovascular disease.

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Physical activity (GPPAQ)

Enter patient’s questionnaire responses to assess physical activity levels.

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Cancer risk (QCancer)

Enter patient’s symptoms and risk factors to estimate the likelihood of an undiagnosed cancer.

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Fracture risk (FRAX)

Enter details of patient’s risk factors to calculate the 10-year probability of fracture.

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Urine albumin: creatinine ratio (ACR), protein: creatinine ratio (PCR), and degree of renal impairment.

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HbA 1c units

Enter glycated haemoglobin
( HbA 1c ) value in % to convert to mmol/mol, and vice versa.

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Height, weight, temperature 

Convert metric values to imperial, and vice versa.

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U&E reference intervals

Standard reference intervals for urea and electrolytes.

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Clinical calculators

Handy calculators and conversions for primary care.