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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.
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How this 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 straight to the section you need, then return to the 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.
Formula guide
Use these formulas to audit the output or explain it to someone else.
2 formulas
Usage examples
Review a ready-made 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
FAQ
Common questions
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.
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