All calculators
85 instant time and date calculators, organised by category.
Calculator categories
AI Cost Calculators
These tools help you estimate what AI model usage actually costs. Pick a provider and model from the dropdown, enter your token counts and request volume, and see the spend per request, per day and per month before you commit. Model availability, pricing and specifications may change — verify pricing directly with the provider before making business decisions.
Creator Economy Calculators
Price your work and forecast your income. These calculators turn views, followers and conversion rates into the numbers creators actually negotiate with.
SaaS & Revenue Calculators
The metrics investors ask about, calculated in seconds. Work out MRR and ARR, churn, CAC, lifetime value, the LTV:CAC ratio, burn, runway, valuation and growth without rebuilding the same spreadsheet every quarter.
Date & Time Tools
Countdowns
Holidays, seasons and big dates.
- Days Until Christmas
- Weeks Until Christmas
- Hours Until Christmas
- Days Until Halloween
- Weeks Until Halloween
- Days Until New Year
- Hours Until New Year
- Minutes Until New Year
- Days Until Easter
- Days Until Thanksgiving
- Days Until Valentine's Day
- Days Until Black Friday
- Days Until Summer
- Days Until Winter
- Days Until Spring
- Days Until Fall
- Days Until Independence Day
- Weeks Until Fourth of July
Date Difference
Days, weeks and workdays between two dates.
- Days Between Dates
- Weeks Between Dates
- Months Between Dates
- Years Between Dates
- Business Days Between Dates
- Workdays Between Dates
- Weekend Days Between Dates
- Business Days Calculator
- Working Days Calculator
Age Calculators
Your exact age in every unit.
- Age Calculator
- Age In Days
- Age In Weeks
- Age In Months
- Age In Hours
- Age In Minutes
- Age In Seconds
- Million Seconds Birthday Calculator
- Billion Seconds Birthday Calculator
Retirement
How long until you clock out for good.
All retirement calculatorsBirthday
Countdowns to your next birthday.
All birthday calculatorsSleep
Bedtimes, wake times and sleep cycles.
All sleep calculatorsPregnancy
Due dates and week-by-week progress.
All pregnancy calculatorsWork
Business days, hours and timesheets.
All work calculatorsYear Progress
How much of the year is gone.
- How Much Of The Year Has Passed
- How Much Of The Year Is Left
- Days Left This Year
- Weeks Left This Year
- Workdays Left This Year
Weekday Counters
Count Mondays, Fridays and weekends.
- How Many Mondays Until Christmas
- How Many Fridays Until Christmas
- How Many Mondays Left This Year
- How Many Fridays Left This Year
- How Many Weekends Left This Year
Friday the 13th
The unluckiest dates ahead.
All friday the 13th calculatorsFun Calculators
Pet years, planet years and more.
- How Many Seconds Have I Been Alive
- How Many Minutes Have I Been Alive
- How Many Hours Have I Been Alive
- Dog Age Calculator
- Cat Age Calculator
- How Old Would I Be On Mars
- How Old Would I Be On Jupiter
Time Since
Elapsed time from any moment.
All time since calculatorsTime Until
Live countdowns to what's next.
All time until calculatorsTime Calculators
Week numbers, fiscal weeks and business calendars.
All time calculators calculators