Runway (job loss)
3.6 months
Budgeting
Emergency Fund Runway + Rebuild Planner
Plan emergency cash runway under income/expense shocks and estimate rebuild timeline to a target fund size.
Runway + Rebuild Output
Runway (custom shock)
21.4 months
Target emergency fund
$25,200.00
Rebuild timeline
12 months
Shock Runway Comparison
Months of reserve coverage under each scenario.
Job Loss
Monthly shortfall $4,200.00
3.6 months
Income Drop 30
Monthly shortfall $280.00
53.6 months
Expense Shock 20
Monthly shortfall $0.00
Cashflow-positive
Custom
Monthly shortfall $700.00
21.4 months
Target Fund Ladder
Funding requirement and rebuild effort by runway target.
3 month target
Rebuild in 0 months
$12,600.00
6 month target
Rebuild in 12 months
$25,200.00
9 month target
Rebuild in 27 months
$37,800.00
12 month target
Rebuild in 42 months
$50,400.00
Shock scenarios
| Scenario | Monthly shortfall | Runway | Shock-window gap |
|---|---|---|---|
| job_loss | $4,200.00 | 3.6 months | $10,200.00 |
| income_drop_30 | $280.00 | 53.6 months | $0.00 |
| expense_shock_20 | $0.00 | Cashflow-positive | $0.00 |
| custom | $700.00 | 21.4 months | $0.00 |
Rebuild sensitivity
- 3 months target ($12,600.00): 0 months
- 6 months target ($25,200.00): 12 months
- 9 months target ($37,800.00): 27 months
- 12 months target ($50,400.00): 42 months
How to use it
- Enter liquid reserves, essential monthly expenses, baseline income, monthly savings capacity, target runway, and a custom shock such as income loss or an expense spike. Use only money you could access within days, not retirement balances.
- Read runway months under job loss and under your custom shock, then compare both with the target runway. The custom-shock result is usually the more honest one for freelancers, commissions, or households with unstable expenses.
- Less than about 3 months of runway under a realistic shock is a warning sign, while 6 months or more gives materially more recovery time. If a short expense spike cuts your runway in half, the reserve is too thin for your risk profile.
- Reduce fixed burn first, because every $500 cut in essential spending extends a $15,000 reserve by one extra month. Then build the gap with the emergency fund calculator or a dedicated savings-goal plan.
- Re-run after layoffs in your industry, a rent increase, a new recurring bill, or a large cash inflow. Track runway months at current burn and the gap to your target.
AI Integrations
Contract, discovery endpoints, and developer notes for agent use.
Always available for agents
AI Integrations
Contract, discovery endpoints, and developer notes for agent use.
Tool contract JSON
https://aifinhub.io/contracts/emergency-fund-runway-planner.jsonStable input and output contract for this exact tool.
Human review
People can use the browser page to sense-check outputs and charts, but agents should still execute against the contract and discovery endpoints.
- /agent-tools.json - machine-readable tool index.
- /llms.txt - human-readable model discovery guide.
- /.well-known/webmcp.json - WebMCP capabilities manifest.
- /.well-known/ai-plugin.json - plugin-style discovery manifest.
{
"tool": "emergency_fund_runway",
"liquid_reserves": 15000,
"essential_monthly_expenses": 4200,
"baseline_monthly_income": 5600,
"monthly_savings_capacity": 850,
"target_runway_months": 6,
"income_loss_percent": 30,
"expense_spike_percent": 10,
"shock_duration_months": 6
} Expand developer notes
Agent playbook
- Resolve Emergency Fund Runway + Rebuild Planner from /agent-tools.json and open its contract before execution.
- Validate inputs against the contract schema instead of scraping labels from the page UI.
- Open the browser page only when a person wants to review charts, assumptions, or related tools.
Agent FAQ
Should ChatGPT, Claude, or another agent click through the UI?
No. Start with /agent-tools.json, then follow the tool's contract URL. The page UI is for human review, not parameter discovery.
When do tools show Quick and Advanced?
Every tool opens in Quick Start first. Advanced Controls keeps the same scenario, reveals more assumptions or diagnostics, and every tool keeps AI integrations inline below the instructions.
When should an agent still open the browser page?
Open it when a human wants to sense-check the output, review the chart, or keep exploring related tools after the calculation finishes.
Questions people usually ask
What does runway mean here?
Runway is how many months your reserves can cover monthly shortfall under a selected income/expense shock scenario.
How is rebuild timeline calculated?
Rebuild months are calculated from the target fund gap divided by monthly savings capacity, rounded up to full months.
Can this handle partial income shocks?
Yes. Set custom income loss and expense spike percentages to model your own stress case.
Is this professional advice?
No. Outputs are planning estimates only — not financial, tax, or investment advice.
Related Resources
Learn the decision before you act
Every link here is tied directly to Emergency Fund Runway + Rebuild Planner. Use the explanation, formula, examples, and benchmarks to pressure-test the calculator output from first principles.
How To Use
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