Free Tools for Doctors, Nurses and Health Workers

Quick calculations for the clinic and the ward: body measurements on WHO or Asian cut-offs, due dates and cycle dates, unit conversions, and PDF tools for reports and forms. Each calculator shows its formula and source; they support your judgement and don't replace it.

All 20 tools here work now, and none of them needs credits.

BMI CalculatorBody mass index, category and healthy weight range on the WHO or Asian cut-offs, in kg, pounds or stones.BMR CalculatorBasal metabolic rate with the Mifflin–St Jeor, Harris–Benedict and Katch–McArdle equations, and calories a day by activity level.Body Fat CalculatorBody fat % three ways: the US Navy tape method, relative fat mass and the BMI method, with fat and lean mass.Ideal Weight CalculatorHealthy weight for your height from the Robinson, Miller, Devine and Hamwi formulas and the BMI range, in kg or lb.TDEE CalculatorTotal daily energy expenditure (TDEE), a calorie target for fat loss or muscle gain, protein, and your BMI (WHO or Asian categories).Maintenance Calorie CalculatorYour maintenance calories (TDEE) and the calories a day to lose or gain weight at a safe rate. Metric or US units.Protein CalculatorDaily protein intake in grams for your weight: the RDA minimum, US guidelines, and ranges for over-65s and athletes.Water Intake CalculatorHow much water to drink a day from weight, exercise and weather, in litres, fluid ounces, cups, glasses or bottles.Pregnancy Due Date CalculatorDue date, weeks pregnant and trimester dates from your last period, conception date, IVF transfer or ultrasound.Ovulation CalculatorEstimate your fertile days, ovulation day and next period from your last period and cycle length, and add them to your calendar.Period CalculatorPredict your next periods, days to go and fertile days from your last period and cycle length, and add them to your calendar.Age Calculator by Date of BirthYour exact age in years, months and days from your date of birth, in weeks, days and hours, the day you were born and your next birthday.Date CalculatorDays, months and business days between dates (with your holidays), and add or subtract days, weeks, months or business days.Unit ConverterLength, weight, volume, pressure, speed, energy, power, time, temperature, fuel economy, angles, data and land (cent, guntha, acre).Scientific CalculatorTrig in degrees or radians, logs, powers and any root, factorials, memory keys and a history of results.Merge PDFCombine PDF files into one, in any order, without uploading.Compress PDF to SizeShrink a PDF to 100 KB, 200 KB, 500 KB or any size for online forms. No upload.Sign PDFDraw your signature and place it on any page of a PDF.PDF EditorAdd text, white-out, boxes, drawings, signatures and images to a PDF. No upload.Citation GeneratorAPA 7, MLA 9, Chicago and Harvard citations for websites, books, book chapters, journal articles, YouTube videos and reports, with DOI and ISBN look-up.

BMI cut-offs for Asian patients

WHO's standard bands put overweight at a BMI of 25, while the Asia-Pacific cut-offs used in India start it at 23. The BMI calculator offers both, so pick the scale that matches the guideline you follow and say which one you used.

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