Free health calculators

Calorie and BMI needs, water intake for a 45°C summer, a blood-sugar unit converter, sleep cycles, a pregnancy due date, the fertile window, and medicine timings that fit a fasting day. Every one runs in your browser and none of it is stored.

Ovulation Calculator — Find the fertile window from your last period and cycle length — and see why it is not what most calculators say. Ovulation is about fourteen days before the NEXT period, not fourteen after the last, and the days that matter are the five BEFORE it. Every date in the Hijri calendar as well as the Gregorian.
Pregnancy Due Date Calculator — Work out an estimated due date from your last period, the date of conception, or an IVF transfer — and see how many weeks and days along you are, which trimester that is, and every date in between. It adjusts for a cycle that is not 28 days, and gives every date in the Hijri calendar as well as the Gregorian one. Nothing is sent anywhere.
Blood Sugar Converter — Convert a blood glucose reading between mg/dL and mmol/L, and HbA1c between % and mmol/mol, with the estimated average glucose. Saudi labs report mg/dL while most research uses mmol/L, and the factor between them is 18. It says where a reading falls and flags one low or high enough to need acting on now.
Sleep Cycle Calculator — Work backwards from when you need to be up, or forwards from now, to the times that land at the end of a ~90-minute sleep cycle rather than mid deep sleep. Allows for the time it takes to fall asleep, shows Fajr, and marks the last third of the night for qiyām.
Water Intake Calculator — Work out a day’s water from your body weight, then add what the heat, your activity and time in the sun actually cost — because “eight glasses a day” describes a mild climate and says nothing about a Riyadh summer. Shows how the total is made up and how to fit it between iftar and suhoor.
Medicine Timing Planner — Spread doses evenly across your waking day, or across the window between iftar and suhoor — about ten hours rather than twenty-four. Each dose is anchored to the nearest prayer, easier to remember than a clock time, and it warns when four doses will not fit comfortably in a fasting night.
Calorie & BMI Calculator — Work out how much you actually burn in a day and what to eat for your goal — resting burn, total daily burn, a calorie target for losing, holding or gaining, and a reasonable protein/carb/fat split, plus your BMI and healthy weight range. Uses Mifflin-St Jeor, which measures closest to reality.

Free health calculators

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