Free Online Calculators, Instantly
Date, time, age, finance and percentage calculators — fast, accurate, and completely free. No sign-up, no ads getting in your way.
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Date Calculators
Calculate days between dates, add or subtract days, and more.
Time Calculators
Calculate time differences, work hours, and time durations.
Age Calculators
Find your exact age, age on a future date, or birthday countdowns.
Finance Calculators
EMI, loan, interest, investment and salary calculators.
Percentage Calculators
Calculate percentages, discounts, profit and margin easily.
Unit Conversion
Convert length, weight, temperature, speed and more.
Business Calculators
Business and productivity related calculators.
Health Calculators
BMI, calorie and other health related calculators.
Math Calculators
General purpose math calculators.
Construction Calculators
Concrete, paint, flooring and other home improvement material calculators.
Automotive Calculators
Car loan, lease, fuel cost and tire size calculators.
Education Calculators
GPA, grade and exam score calculators for students.
Science Calculators
Physics and chemistry calculators for everyday science problems.
Cooking Calculators
Recipe scaling, oven temperature and baking ratio calculators.
Volume Converters
Convert between liters, gallons, quarts, pints, cups, fluid ounces and more.
Utility Tools
Random number generators, dice rollers and simple everyday tools.
Text Tools
Change text case, clean up formatting, and other everyday text utilities.
Popular Calculators
Days From Date Calculator
Find out exactly what date it will be a certain number of days from any date.
Days Before Date Calculator
Find out exactly what date it was a certain number of days before any date.
Days Between Two Dates Calculator
Calculate the exact number of days, weeks, months and working days between two dates.
Working Days Calculator
Calculate the number of working days (business days) between two dates, excluding weekends and public holidays.
Deadline Calculator
Find your exact deadline date by adding a number of allowed days to the date you received a notice.
Day of Week Calculator
Find the day of the week, ISO week number, day of year, and leap-year status for any date.
Countdown Calculator
Live countdown to any future date, showing days, hours, minutes and seconds remaining.
Date Difference Calculator
Compare two dates and see the difference in years, months, days, total days, weeks and hours.
Days Until Calculator
Find out exactly how many days until Christmas, New Year, a birthday, or any date you choose.
Days Since Calculator
Find out exactly how many days have passed since your birth date, wedding day, or any past event.
Weekday Count Calculator
Find out how many times a specific weekday (like Friday) occurs in any given year.
Week Number Calculator
Find the ISO-8601 week number for any date.