AI Meal Plan Generator - Free AI meal plan generator that builds a personalized 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 shopping list. New

Alcohol Calorie Calculator - Build a real drinking session from beers, wines, spirits, and cocktails and see total calories, alcohol-vs-mixer breakdown, exercise minutes to burn it off, food equivalents, standard-drinks count, and projected weekly and annual weight impact. Includes 21 preset drinks plus a custom-drink builder. New

Baby Eye Color Predictor - Predict your baby's eye color probabilities (brown, green, and blue) from the eye colors of both parents, and optionally the grandparents, using a genetics-based two-gene inheritance model. See the odds on animated iris visuals, an interactive Punnett square, and a clear step-by-step breakdown of how dominant and recessive eye-color genes combine.

Baby Growth Percentile Calculator - 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. Featured

Baby Milk Intake Calculator - Estimate how much milk your baby needs each day and per bottle, based on age and weight. This baby milk intake calculator shows a healthy daily range (not just one number), the amount per feed, and a clear 24-hour feeding schedule with bottle times. It supports formula and pumped breast milk in metric or imperial units, displays results in millilitres or fluid ounces, and includes safety guidance such as the recommended formula ceiling and reminders for breastfed and solid-food stages.

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

Biological Age Calculator - 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.

Blood Donation Time Calculator - 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.

Blood Pressure Interpreter - 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.

Blood Sugar Converter - 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.

Caffeine Half-Life Tracker - Track how much caffeine is still in your body hour by hour. Add each coffee, tea, or energy drink with its time, and the tracker uses caffeine's half-life to plot a decay curve, show your peak level, estimate how much caffeine remains at bedtime, and tell you when you are clear to sleep. Adjustable half-life for fast and slow metabolizers, daily 400 mg limit check, and a full hourly breakdown. New

Caffeine Overdose Calculator - 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. Featured

Carb-to-Insulin Ratio Calculator - Free Carb-to-Insulin Ratio Calculator: use the 500 or 450 rule to find how many grams of carbohydrate one unit of insulin covers, compare rules, see units needed for common foods, and estimate a mealtime bolus dose from your total daily insulin dose (TDD). New

Carbohydrate Calculator - 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.

Child BMI Percentile Calculator - Calculate your child's BMI and CDC BMI-for-age percentile for ages 2 to 20. Enter your child's sex, age, height, and weight to see their exact percentile on the official CDC growth chart, their weight-status category (underweight, healthy weight, overweight, or obese), and the healthy weight range for their age and height. Includes an interactive CDC percentile growth curve, a clear percentile gauge, and a full step-by-step breakdown in both metric and imperial units.

Child Height Predictor - Predict your child's adult height from the parents' heights using the mid-parental height method. See the predicted height with its 95% range on a visual height ruler, compare your child against mum and dad with scaled family figures, and find out what adult-height percentile the prediction falls into. Supports metric (cm) and imperial (ft/in) units with a clear step-by-step breakdown.

Coffee vs. Sleep Calculator - 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.

Diaper Size Calculator - Find the right diaper size for your baby by weight and age, see exactly where your baby sits inside the size range, and check whether it is time to size up. The Diaper Size Calculator recommends a primary size plus the overlapping alternate, projects how many weeks until the next size, and estimates how many diapers you will use per day, week, and month — with an optional cost estimate. Supports pounds and kilograms with a clear visual size ladder and a step-by-step breakdown.

How Much Water to Drink A Day? - Calculate your personalized daily water intake based on weight, activity level, climate, and health factors. Get a visual hydration plan with hourly schedule and tips.

How Much Weight Should I Lose? - 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.

Insulin Sensitivity Factor Calculator - Free Insulin Sensitivity Factor (ISF) Calculator: 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 an optional correction dose in mg/dL or mmol/L from your total daily dose (TDD). New

Intermittent Fasting Calculator - 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.

Jet Lag Calculator - 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. New

Keto Calculator - 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.

Life Expectancy Calculator - 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.

Macro Calculator - Calculate Your Daily Macros for Any Goal - 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.

Medication Dosage Calculator - Calculate medication dosage three ways: by body weight (mg/kg), by age (Clark's, Young's, and Fried's Rule), or by body surface area (Mosteller BSA formula). Includes a 14-medication preset library, mg-to-ml liquid conversion, dosing schedule with max-daily-dose safety check, and side-by-side method comparison. New

Nap Calculator - Find the perfect nap length and the exact time to set your alarm so you wake up refreshed instead of groggy. The Nap Calculator maps your nap onto real sleep stages, shows a visual hypnogram with the "grogginess zone" to avoid, and works both ways: enter when you will lie down to get your wake-up times, or enter when you need to be awake to get your latest fall-asleep time. Includes power naps, recovery naps, slow-wave naps, and full 90-minute sleep cycles, plus a coffee-nap tip. New

Net Carbs Calculator - 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.

Recipe Nutrition Calculator - 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.

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

Standard Drink Calculator - Convert any drink into standard alcohol units from its volume and ABV. Supports regional definitions (US 14g, UK 10mL units, Australia 10g, Canada 13.6g, Europe/WHO 10g) so you can compare beer, wine, spirits, and cocktails on the same scale. See pure alcohol grams, alcohol calories, an animated drink-unit visual, a side-by-side country comparison, and a step-by-step breakdown. New

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