MAXScanner Calculator

Project Duration Calculator

Estimate project workdays and finish date from total work hours, daily capacity and one to seven scheduled work days per week.

Live editable inputs

Change the values and see the calculation update immediately.

Formula and working

The relationship behind the answer stays visible on the page.

Assumptions visible

Rates, dimensions and limitations are kept explicit instead of hidden.

Connected next steps

Move into the next genuinely different calculation without keyword-copy pages.

Planning inputs

Change any assumption; the calculation updates immediately.

Project work hoursProductive hours per workdayWork days per weekPlan start date

Calculated plan

10 workdays · 2026-11-13

80 project work hours

8 productive hours/workday

5 scheduled work days/week

12 calendar days from start through finish

8 work hours on final scheduled day

Finish-date sensitivity by productive capacity

Capacity	Workdays	Finish
4 h/day	20	2026-11-27
6 h/day	14	2026-11-19
8 h/day	10	2026-11-13
10 h/day	8	2026-11-11

Show the working

1. Workdays = ceil(80 ÷ 8) = 10.
2. Starting 2026-11-02, count 10 scheduled workday(s) on a 5-day/week pattern.
3. Finish date = 2026-11-13.
4. Final-day load = 80 − (10 − 1) × 8 = 8 hours.

More actions

Shared links reopen these inputs. Recent and saved calculations stay in this browser unless you clear site data.

Planning results follow only the schedule and capacity assumptions entered above. Holidays, leave, interruptions and individual performance are not inferred unless the calculator explicitly includes them.

How to use this calculator

Project Duration Calculator turns the schedule and capacity values you enter into a planning estimate. It does not guess holidays, leave, local labor rules or interruptions that are not represented in the inputs.

Step-by-step

Step 1
Enter the schedule or workload values shown.
Step 2
Set the work/study days, breaks, rates or thresholds that apply.
Step 3
Review the result and the assumptions displayed beside it.

Where this calculator is useful

Work and study planning

Use the result as a check within this type of task, with the assumptions shown above.

Capacity estimates

Use the result as a check within this type of task, with the assumptions shown above.

Timesheet and schedule checks

Use the result as a check within this type of task, with the assumptions shown above.

Common questions

Are holidays automatically removed?

No, unless a specific calculator provides a holiday input.

Are overtime rules automatic?

No. Overtime calculations use the threshold or multiplier you enter and do not determine legal entitlement.

Can I use a six- or seven-day schedule?

Yes. Those planning calculators allow one to seven scheduled days per week.

Need a different calculation?

Use the calculator library to switch tasks when the question, unit or assumption changes.

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Planning notes

Convert project hours into scheduled workdays and a finish date

Project Duration treats entered hours/day as productive capacity assigned to this project, rounds the required number of scheduled workdays upward, and exposes the partial load on the final day rather than pretending every final day is full.

Worked example — 80 hours at 8 hours/day

An 80-hour project at 8 productive hours per scheduled workday needs 10 workdays. Starting Monday 2026-09-14 on a Monday–Friday pattern places the tenth scheduled workday on Friday 2026-09-25.

Useful for

Capacity-based project finish estimates
Comparing finish dates at different productive hours/day
Testing 5-, 6- or 7-day weekly work patterns

Limits and assumptions

Hours/day means capacity available to this project, not necessarily paid shift length.
Holidays, leave, dependencies, interruptions and resource contention are not automatically modeled.
The final workday may be partial; the calculator reports the remaining work allocated to that day.