Time Duration Calculator
Time Duration Calculator by NIVITA HUF. Model scenarios, review calculations, explore detailed breakdowns and export results. Useful free planning tool.
Set your assumptions
Update the values to calculate your scenario.
Your calculation
Results update as you enter information.
JavaScript is required for interactive calculations.
How this calculator works
Duration = calendar day difference × 1440 + difference between entered time-of-day minutes.
Important assumptions
To calculate overnight sleep or work duration, set end date to the next day.
About the Time Duration Calculator
What inputs are needed for the Time Duration Calculator?
The calculator supports Start date; End / reference date; Days to add / subtract; Weekend days; Holidays (optional YYYY-MM-DD per line); Start hour (0–23). You can change each applicable input and immediately recalculate.
How does the Time Duration Calculator calculate its results?
Duration = calendar day difference × 1440 + difference between entered time-of-day minutes.
Can I save or share my calculation?
Yes. Use Export CSV for the results table, Copy results for a summary, Share scenario for an input-preserving link, or Print to keep a copy. No sign-in is needed.
Are calculator results guaranteed?
No. Calculations depend on the values entered and the assumptions shown. Financial products and regulatory rules can change, and investment projections do not guarantee returns.