BAC Calculator
Blood alcohol level depends on the alcohol in the drink, the time sipped, the body water pool, and metabolism your liver adds. The tool shows a model curve, not a police breath test. It cannot acco...
Health Calculators Open →Health Calculators
Free health and fitness calculators.
Free health and fitness calculators.
BMI Calculator
Body mass index is a single number from height and weight, widely used, openly imperfect. It does not know muscle, bone density, or where you carry fat, so it screens populations better than it dia...
Health Calculators Open →BMR Calculator
Basal metabolic rate is an estimate of calories burned at rest; total daily energy adds your movement. Mifflin–St Jeor is one of several equations—pick activity honestly and expect a range, not a p...
Health Calculators Open →Body Fat Calculator
Skinfold and tape methods estimate body fat for screening, not a CT scan. The Navy method uses a few girths and height in inches to output a percent you can track over time with consistent techniqu...
Health Calculators Open →Calorie Calculator
Cutting, maintaining, or gaining weight ties calories to a goal, not just a formula printout. The tool starts from a maintain estimate, lets you nudge the offset, and splits macronutrients in grams...
Health Calculators Open →Calories Burned Calculator
Energy used in exercise scales with your mass, the duration, and how hard the effort feels, even before wearables. Pick an activity, enter your weight, minutes, and a self-rated intensity, then rea...
Health Calculators Open →Calories in Food Calculator
Counting food calories is faster when common ingredients and portion sizes are pre-loaded instead of re-weighing the library each day. This tool sums selected foods with approximate kcal from stand...
Health Calculators Open →Due Date Calculator
A due date from last menstrual period is a planning anchor that your provider may move after an early ultrasound, especially with irregular cycles. The calculator adds the usual 280 days from a cho...
Health Calculators Open →Heart Rate Zone Calculator
Training by heart rate is popular because the same effort changes with heat, sleep, and caffeine, but a zone still lands you in a broad band. Enter a max and resting HR (or a field-test pair), and ...
Health Calculators Open →Ideal Weight Calculator
“Ideal weight” has many formulas, each a simplification. This page places classic clinical-style estimates next to a BMI range so you can see the spread, not a single number to chase. Body composit...
Health Calculators Open →Macro Calculator
Macros are the next layer under calories: how much of your energy comes from protein, carbs, and fat for your training and appetite. The tool converts a total calorie budget and a ratio into grams ...
Health Calculators Open →Ovulation Calculator
Fertility planning uses cycle averages; real cycles wobble, stress, and illness included. The tool shows a simple calendar-style grid from a typical 28–day model you can retune. It educates, not di...
Health Calculators Open →Period Tracker Calculator
A typical cycle is described by length and the first day of bleeding, but stress, travel, and hormones move the calendar. Enter a few past period starts to get an average and a best-guess next wind...
Health Calculators Open →Pregnancy Due Date Calculator
Dating a pregnancy from last menstrual period is standard for early planning, not a promise of a birthday. This screen gives an estimated due date, trimester marks, and a place to read context whil...
Health Calculators Open →Running Pace Calculator
Pace in minutes per mile or kilometer is how runners plan workouts and race splits, not a mystery heart-rate zone. Type a time and distance, or a distance and a desired pace, to get the missing num...
Health Calculators Open →Sleep Calculator
Sleep is not a spreadsheet, but gentle math can nudge you toward a wake time that lands on a full cycle boundary. The tool works backward from a wake time or forward from a bedtime, adding a short ...
Health Calculators Open →Sleep Quality Calculator
Sleep "quality" blends how long you were in bed, how many times you woke, and a few self ratings like grogginess and time to fall asleep. Answer honestly for a small composite score and some plain-...
Health Calculators Open →Steps to Calories Calculator
A ten-thousand-step day is a headline; your caloric burn still depends on speed, size, and terrain. Type step count, weight, and a walking pace to translate steps into an energy estimate and a dist...
Health Calculators Open →VO2 Max Calculator
VO2 max is a strong predictor of endurance performance, but gold-standard measurement needs a gas-exchange lab. This page uses a running time-trial and body weight, or a simpler age-based model, to...
Health Calculators Open →Water Intake Calculator
Hydration advice ranges from “eight glasses” to “drink to thirst,” and the truth is personal. This model scales with weight and bumps up for hot weather or long workouts as a simple heuristic. If y...
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