Free Date Calculators
Every date calculator on DateCalcTools. Pick a tool to count days, weeks, months, business days, ages, or anything in between — all client-side and free.
Core calculators
How Many Days Until
Find out exactly how many days, weeks, and months remain until any future date.
Open calculatorDate Difference Calculator
Compare two dates and see the difference in days, weeks, months, and years.
Open calculatorBusiness Days Calculator
Count the working days between two dates, with weekends excluded.
Open calculatorAge Calculator
Calculate your exact age in years, months, and days from your birth date.
Open calculatorAge in Days Calculator
Find out the total number of days you have been alive.
Open calculatorCountdown Calculator
Create a simple countdown to any upcoming event or special date.
Open calculator
Date math
- Date Add / Subtract CalculatorAdd or subtract days, weeks, months, or years from any date.
- Months Between DatesFind the exact number of months between two dates.
- Years Between DatesFind the exact number of years between two dates.
- School Days CalculatorCount the school days (Mon–Fri) between two dates.
- Working Days CalculatorCount working days between two dates with configurable weekends.
Age & life events
Utilities
Life events
- Anniversary CalculatorFind your current anniversary year and a countdown to the next.
- Pregnancy Due Date CalculatorEstimate the due date from the last menstrual period (LMP).
- Pregnancy Week CalculatorFind the current pregnancy week from an LMP or due date.
- Conception Date CalculatorEstimate the conception date from the due date.
Frequently asked questions
Are all calculators free?
Yes. Every calculator on this page is free and works in your browser without signup.
Do these calculators work on mobile?
Yes. The site is fully responsive and tested on phones, tablets, and desktops.
Which calculator should I use for working days?
Use the Business Days Calculator or the Working Days Calculator — they share the same engine with configurable weekends.
Are pregnancy and retirement calculators medical or financial advice?
No. They use standard formulas (Naegele's rule for pregnancy, simple year math for retirement) and are informational only.