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Solo Project Calculator

The Solo Project Calculator estimates total project effort, adjusted effort, expected completion days, and progress for a one-person project. It combines phase-level hour estimates with contingency, available daily hours, and work already completed.

This is useful for personal software builds, research projects, creative work, home projects, or professional deliverables managed by one person. Breaking effort into planning, execution, review, and delivery makes the estimate easier to inspect than a single unexplained total.

Inputs

hours
hours
hours
hours
%
hours
hours
Result
—
Days remaining estimates the number of equivalent workdays needed at the entered daily availability. Progress is measured against adjusted effort, including contingency.
Base project effort—
Adjusted effort—
Remaining effort—
Progress—

1. Estimate planning
Add research, scoping, setup, and decision-making effort.

2. Estimate execution
Enter the active production or implementation hours.

3. Include review and delivery
Account for testing, editing, revisions, packaging, submission, or handoff.

4. Add contingency
Reserve a percentage for unknowns and estimation error.

5. Enter your daily capacity
Use the hours you can consistently devote on a working day.

6. Record completed effort
Add actual hours already spent to estimate progress and remaining days.

Base project effort = Planning + Execution + Review + Delivery
Adjusted project effort = Base project effort × (1 + Buffer % ÷ 100)
Remaining effort = Max(Adjusted project effort − Completed hours, 0)
Days remaining = Remaining effort ÷ Available hours per day
Progress = Min(Completed hours ÷ Adjusted effort × 100, 100%)

What the result means

Days remaining estimates the number of equivalent workdays needed at the entered daily availability. Progress is measured against adjusted effort, including contingency.

Phase estimates should not overlap. The contingency buffer is applied to the entire base estimate, and completed hours are capped at 100% progress.

Given:
8 planning hours, 42 execution hours, 10 review hours, 4 delivery hours, a 15% buffer, 4 hours per day, and 12 hours completed.

Calculation:
Base effort = 8 + 42 + 10 + 4 = 64 hours.
Adjusted effort = 64 × 1.15 = 73.6 hours.
Remaining effort = 73.6 − 12 = 61.6 hours.
Days remaining = 61.6 ÷ 4 = 15.4 days.
Progress = 12 ÷ 73.6 × 100 = 16.30%.

Result:
The project is about 16.3% complete and requires roughly 15.4 additional four-hour workdays.

Should completed hours include unproductive time?

Use hours that were part of the project effort, including necessary research or rework. Exclude unrelated interruptions.

Why is progress measured against adjusted effort?

The contingency is part of the current forecast, so comparing completed work with adjusted effort gives a more conservative progress estimate.

What if completed hours exceed the estimate?

Progress is capped at 100%, and remaining effort becomes zero. Revise the phase estimates if more work is still required.

Can phases be omitted?

Yes. Enter zero for any phase that does not apply.

When should I update the calculator?

Update it when actual effort, remaining scope, daily availability, or the contingency assumption changes materially.