Date & Health Online Free
Health, date, and wellness calculators calibrated against standard scientific formulas (WHO, Mifflin-St Jeor, Naegele). Accurate time zone scheduling, age breakdowns, and daily productivity boosters.
Exact Age Calculator & Birthday Countdown
Calculate exact age in years, months, weeks, days, hours, and minutes. Includes upcoming birthday countdown and life milestones.
Date Difference & Working Days Calculator
Calculate the exact number of days, weeks, business working days, and weekends between any two dates.
Hijri-Gregorian Islamic Date Converter
Convert dates between the Islamic Hijri calendar (Umm al-Qura) and Gregorian calendar with -2 to +2 day moon sighting adjustment.
Timezone Converter & World Meeting Planner
Compare overlapping business working hours across multiple global time zones to schedule remote team meetings effortlessly.
BMI & Daily Calorie Calculator
Calculate Body Mass Index (BMI) based on WHO guidelines, and Total Daily Energy Expenditure (TDEE) via the Mifflin-St Jeor equation.
Pomodoro Focus & Study Timer
Boost productivity with customizable 25-minute work sprints, 5-minute short breaks, and long break intervals.
Text to Speech (TTS) Natural Reader
Listen to written articles and notes using high-quality browser Web Speech synthesis voices with pitch and rate controls.
Pregnancy Due Date Calculator (Naegele's Rule)
Calculate estimated delivery date (EDD), current gestational age in weeks/days, trimester timeline, and baby milestones.
Ideal Body Weight & Body Fat Calculator
Estimate healthy target body weight ranges based on Robinson, Miller, Devine, and Hamwi clinical medical formulas.
TDEE & Macro Nutrition Calculator
Calculate daily maintenance calories and optimal protein, carb, and fat gram ratios for muscle gain or fat loss.
Period & Ovulation Fertility Calendar
Estimate fertile ovulation windows and predict upcoming menstrual cycle start dates with calendar tracking.