Plan Collision

Find the first week your plans exceed shared time or cash, then compare delays and removals.

Your numbers

First collision week

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A planning simulation, not a prediction. Weekly income and capacity are constant; upfront costs occur at each plan’s start. Plans outside the horizon are excluded. Time cannot be borrowed from another week; cash carries forward.

Formula

Each week, update cash with C = C+I−E−A−U and free hours with H = T−F−P. I is income, E is essential spending, A is active-plan recurring costs, and U is newly starting plans' upfront costs. T is available hours, F is fixed hours, and P is active-plan hours.

Find the first week your plans exceed shared time or cash, then compare delays and removals.

Worked example

First planning week starts (YYYY-MM-DD): 2026-11-02
Planning horizon (weeks): 8
Total available hours each week: 40
Existing fixed hours each week: 30
Starting available cash: 1000
Cash income each week: 600
Essential cash spending each week: 500
Delay each plan for comparison (weeks): 2

First collision week: 3
Weeks with a time or cash shortfall: 2 weeks
Largest weekly time shortfall: 4 hours
Largest cumulative cash shortfall: 0
Cash at horizon end: 1,140

Plans to fit together

Course
Hours/week: 8
Cost/week: 60
Upfront cost: 200
Start week: 1
End week: 4
Side project
Hours/week: 6
Cost/week: 30
Upfront cost: 100
Start week: 3
End week: 6

Scope and limitations

Inputs are checked for missing values and allowed ranges. A result outside the finite numeric range is not displayed. Rounding affects display, while the calculation uses the model’s numeric precision.

Check your units and assumptions before relying on a result. Changing a label does not convert a currency or physical unit.

Formula version: a140f2c19668 · Example checked: 2026-10-30

Methodology