Everyday Life Calculators

Calculate the exact difference between two dates in days, weeks, months, and years.

Find out exactly how many days, hours, and minutes old you are from your birthdate.

Calculate optimal bedtime or wake-up time based on 90-minute sleep cycles.

Calculate ovulation date, fertile window, and next period from your cycle data.

Calculate calories burned during 15+ activities using weight, duration, and MET values.

Convert between cups, tablespoons, teaspoons, ml, liters, oz, and grams for recipes.

Convert between seconds, minutes, hours, days, weeks, months, and years all at once.

Convert time between 20 major world cities instantly for global scheduling.

Calculate your Grade Point Average from letter grades and credit hours on the 4.0 scale.

Calculate reading time for any text at slow, average, and fast reading speeds.