Health Calculators

Build a personalised 7-day meal plan from your diet type, daily calorie target, meals per day and food preferences. Get per-day calorie and macro breakdowns plus an auto-generated weekly grocery list.

Build a real drinking session from beers, wines, spirits and cocktails to see total calories, the alcohol-vs-mixer split, exercise minutes to burn it off, standard drinks and the projected weekly and annual weight impact.

Predict your baby's brown, green and blue eye-colour odds from both parents, and optionally the grandparents, with a genetics-based two-gene model. See animated iris visuals, an interactive Punnett square and a step-by-step breakdown.

Track your baby's height, weight, and head circumference against WHO growth standards. Get instant percentile rankings with visual growth charts for boys and girls aged 0-24 months.

Estimate how much milk your baby needs each day and per bottle from age and weight. Shows a healthy daily range, the amount per feed and a 24-hour schedule, in millilitres or fluid ounces, with formula-ceiling safety guidance.

Calculate your estimated blood alcohol content (BAC) based on drinks consumed, body weight, gender, and time elapsed using the Widmark formula.

Estimate your biological age based on lifestyle, health metrics, and habits. Compare your body's functional age to your chronological age across 4 health dimensions with personalized improvement recommendations.

Calculate your next eligible blood donation date based on donation type. Track whole blood, plasma, platelet, and double red cell donations with personalized countdown and eligibility guidelines.

Interpret your blood pressure reading against AHA/ACC 2017 clinical categories. Get your BP classification, pulse pressure, mean arterial pressure (MAP), and personalized health insights with an animated visual gauge.

Convert blood sugar levels between mg/dL (US) and mmol/L (UK/International) with instant results, diabetes risk assessment, visual range indicators, and comprehensive glucose reference charts.

Track how much caffeine is still in your body hour by hour. Add each coffee, tea or energy drink with its time to plot a decay curve, see your peak, estimate the level at bedtime and learn when you are clear to sleep.

Calculate your safe daily caffeine limit based on body weight, then see the equivalent in espresso shots, cups of coffee, energy drinks (Monster, Red Bull), tea, and more. Includes animated drink visualizations and a danger zone meter.

Use the 500 or 450 rule to find how many grams of carbohydrate one unit of insulin covers, compare the two rules, see the units needed for common foods, and estimate a mealtime bolus from your total daily insulin dose.

Calculate your optimal daily carbohydrate intake based on your caloric needs, activity level, body metrics, and diet goals. Get a personalized carb breakdown with fiber, sugar limits, meal timing, and food source recommendations.

Calculate your child's BMI and CDC BMI-for-age percentile for ages 2 to 20. Enter sex, age, height and weight to see the exact percentile on the CDC growth chart, the weight-status category and the healthy weight range.

Predict your child's adult height from the parents' heights with the mid-parental method. See the prediction and its 95% range on a height ruler, compare the child with each parent, and find the adult-height percentile it lands in.

Compare the alertness boost from coffee versus a power nap. See peak alertness timing, caffeine crash window, and which option gives you better sustained focus based on sleep science and caffeine pharmacokinetics.

Find the right diaper size for your baby by weight and age, see where they sit inside the size range, and check whether it is time to size up. Projects weeks to the next size and diapers used per day, week and month, with cost.

Find out how much weight you should lose based on BMI analysis, get a safe weight loss timeline, calorie deficit plan, and personalized milestones to reach your healthy weight range.

Use the 1500, 1700, 1800 or 2000 rule to find how much one unit of insulin lowers your blood glucose, compare the rules side by side, and estimate a correction dose in mg/dL or mmol/L from your total daily dose.

Plan your intermittent fasting schedule with visual fasting and eating windows. Supports 16:8, 18:6, 20:4, OMAD, and custom protocols with a body process timeline.

Estimate jet lag recovery time from origin and destination time zones, travel direction, and flight time. Get personalized sleep, light exposure, meal timing, and arrival-day adjustment tips.

Calculate your personalized keto macros for fat, protein, and net carbs. Get daily calorie targets, macro ratios, and meal planning insights tailored to your body composition, activity level, and ketosis goals.

Estimate your life expectancy based on age, gender, lifestyle habits, and health factors. See how smoking, exercise, diet, sleep, and stress affect your projected lifespan with visual breakdowns and personalized improvement tips.

Calculate your optimal daily macronutrient needs with our advanced macro calculator. Get personalized protein, carbs, and fat targets based on your body, activity level, and fitness goals.

Calculate medication dosage three ways: by body weight in mg/kg, by age with Clark's, Young's and Fried's rules, or by body surface area with the Mosteller formula. Includes mg-to-ml conversion and a max-daily-dose safety check.

Find the perfect nap length and the exact alarm time so you wake refreshed, not groggy. Maps your nap onto real sleep stages with a hypnogram marking the grogginess zone, and works from either your lie-down time or your wake-up time.

Compute net carbs by subtracting dietary fiber and sugar alcohols from total carbohydrates. Supports different sugar alcohol types with accurate glycemic impact factors, daily keto budget tracking, and a visual carb waterfall breakdown.

Calculate the total calories, protein, fat, carbohydrates, and fiber from your recipe's ingredient list. Get per-serving nutrition facts, a macro breakdown chart, and daily value percentages.

Calculate optimal sleep and wake times based on 90-minute sleep cycles. Get personalized recommendations for your age group and track sleep debt.

Convert any drink into standard alcohol units from its volume and ABV. Supports the US, UK, Australian, Canadian and WHO definitions so beer, wine, spirits and cocktails compare on one scale, with pure alcohol grams and calories.

Calculate your personalized daily water intake based on body weight, activity level, and climate. Get a visual glass tracker and hourly drinking schedule.