Free Online Calculators
Simple, fast calculators for project planning, dates, deadlines, working days, and time calculations.
Project & Time Calculators
Choose the tool that matches the calculation you need. Each calculator is designed to give you a clear result without spreadsheets or manual calculations.
Project Duration Calculator
Estimate a project completion date based on a start date and planned duration.
Use Calculator →Working Days Calculator
Calculate the number of working days between two dates while excluding weekends.
Use Calculator →Deadline Calculator
Find a deadline by adding a period of time to a starting date.
Use Calculator →Date Calculator
Add or subtract days, weeks, months, or years from a date.
Use Calculator →Time Calculator
Add or subtract hours, minutes, and seconds or calculate the time between two times.
Use Calculator →Days Between Dates
Find the number of calendar days between two dates.
Use Calculator →Simple Tools. Clear Results.
Project Time Tools is built to make common project and time calculations quick and easy.
Free to Use
Use the calculators online without complicated setup.
Fast Results
Get calculations quickly without manual formulas.
Easy to Use
Simple interfaces designed for everyday calculations.
Project Focused
Tools built around dates, deadlines, schedules, and project planning.
Which Calculator Do I Need?
Not sure where to start? Choose the calculator based on what you want to find.
I need a project completion date
Start with a project date and duration to estimate when the project will finish.
I need to count working days
Calculate weekdays between two dates while excluding weekends.
I need to calculate a deadline
Add a period of time to a starting date to find the resulting deadline.
I need to count days between dates
Find the calendar-day difference between two dates.
Frequently Asked Questions
Common questions about the Project Time Tools calculators.
Are these calculators free?
Yes. The calculators on Project Time Tools are designed to be free to use online.
Which calculator should I use for a project deadline?
Use the Deadline Calculator when you have a starting date and a period of time available. Use the Project Duration Calculator when you are specifically estimating a project’s completion date.
Which calculator should I use to exclude weekends?
Use the Working Days Calculator when you need to calculate weekdays while excluding Saturdays and Sundays.
Can I calculate the number of days between two dates?
Yes. The Days Between Dates Calculator calculates the calendar-day difference between a start date and an end date.
Can I add or subtract time from a date?
Yes. The Date Calculator lets you add or subtract days, weeks, months, and years from a starting date.
Can I calculate the time between two times?
Yes. The Time Calculator can calculate the duration between two times, including intervals that cross midnight.
Ready to Calculate?
Choose a Project Time Tools calculator and get the result you need in seconds.
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