Other
Time Duration Calculator
Calculate the duration between two dates in various units.
Inputs
Adjust the assumptions to match your scenario. Results update instantly.
Results
Primary outputs and comparison insights are built from the current inputs.
Weeks
12.86
Duration converted to weeks.
Months (approx)
2.96
Approximate duration in months.
Hours
2,160
Duration converted to hours.
Sponsored
Ad placement reserved.
How this Time Duration Calculator works
The Time Duration Calculator converts a number of days into weeks, months, and hours for quick reference. Enter number of days and hours per day to estimate weeks, months (approx), and hours. The calculator updates instantly and adds a comparison table plus chart so you can test the sensitivity of the result before you use it in a decision.
Quick guide
Jump to the section you need, then return to the time duration calculator.
Inputs
- Duration in days to convert.
- Working or active hours per day for hour conversion.
Outputs
- Duration converted to weeks.
- Approximate duration in months.
- Duration converted to hours.
Assumptions
- Average month length of 30.44 days.
- No leap year adjustment.
Tips
- For exact date differences, use a date calculator.
- Project timelines benefit from week-based planning.
Time Duration Calculator formula guide
Use these time duration calculator formulas to audit the output or explain it to someone else.
2 formulas
Time Duration Calculator examples
Review a ready-made time duration calculator scenario, copy it, then tweak inputs to match your case.
Example
Project timeline
Inputs
- Example input Number of days: 120
- Example input Hours per day: --
Outputs
- Example result Weeks: 17.14
- Example result Months (approx): 3.94
- Example result Hours: 2,880
120 days is about 17 weeks or roughly 4 months — useful for sprint planning.
Duration by days
| Number of days | Weeks | Months (approx) |
|---|---|---|
| 60 | 8.57 | 1.97 |
| 90 | 12.86 | 2.96 |
| 120 | 17.14 | 3.94 |
| 150 | 21.43 | 4.93 |
| 180 | 25.71 | 5.91 |
Months are approximated at 30.44 days (average month length).
Time conversion
Focus point
60
8.57
Position
#1 of 5
Original order
Share of total
10%
Total: 85.71
Months are approximated at 30.44 days (average month length).
References
- Calendar time unit conversions
- Average month length calculation
Learn more
Guides connected to the time duration calculator
Use these short guides when you want the decision framework behind the numbers, not just the raw output.
Category guide
Everyday Utility Calculator Guide
Use date and age tools to answer scheduling and timeline questions without manual counting errors.
Directly related
Articles that mention this calculator
how to count days between dates
How to Count Days Between Dates and Avoid Deadline Mistakes
Use date, age, and time-duration calculators to handle calendar ranges, offsets, and age thresholds without manual counting errors.
Read the guide
how to calculate work hours and shifts
How to Calculate Shift Lengths, Breaks, and Weekly Timesheets Correctly
Use hours, work hours, time duration, and time calculators to handle shifts, unpaid breaks, and weekly payroll totals without manual counting errors.
Read the guide
age calculator vs date calculator
Age Calculator vs Date Calculator: When Should You Use Each One?
Use age, date, time duration, and time calculators to choose the right tool for birthdays, deadlines, offsets, and exact elapsed time.
Read the guide
FAQ
Time Duration Calculator FAQ
What does the Time Duration Calculator do?
The Time Duration Calculator converts a number of days into weeks, months, and hours for quick reference. Enter number of days and hours per day to estimate weeks, months (approx), and hours. The calculator updates instantly and adds a comparison table plus chart so you can test the sensitivity of the result before you use it in a decision. It is part of our other toolkit.
What inputs do I need?
Typical inputs include Duration in days to convert., Working or active hours per day for hour conversion..
How are the results calculated?
We follow the formulas and assumptions outlined in the "How this calculator works" section. You will see outputs like Duration converted to weeks., Approximate duration in months., Duration converted to hours..
Can I share or download the results?
Use the Copy link or Print buttons to share your results. If a table or chart appears, you can download the data as CSV.
Is my data stored?
No. Calculations run in your browser and we do not store your inputs.
Related
Related calculators for other workflows
These links answer the next question people usually ask after using the time duration calculator.