Emergency Fund Runway Simulator

Estimate how long your cash buffer lasts under baseline and adverse scenarios, then quantify the funding gap needed to reach a safer runway target.

⏱️ 4-7 minutes • 💪 Short

Updated 2026-03-09

How This Tool Works

📋 Purpose

This simulator helps you understand cash-runway risk and quantify the top-up required to reach a safer emergency reserve target.

⚙️ How It Works

  1. 1
    Enter cash buffer, monthly essentials, debt minimums, income, and runway target
  2. 2
    Calculate baseline runway plus stress scenarios with inflation adjustments
  3. 3
    Review funding gap and monthly top-up needed to close resilience shortfall
UK Inflation Data
Real-time inflation adjustments
Historical Inflation Trends
Loading UK inflation data from ONS...
Financial Position
Enter your current financial data

Monthly Burn Rate:£2,500

Monthly Surplus:£1,000

Current Runway
Financial resilience under normal conditions
Months of Coverage
3.2 months
Depletion Date
Jun 2026
Target: 6mo
3.2mo
0
2
4
6
8
10
12
Scenario Analysis
Runway under income loss with cost increases

Conservative

Moderate Risk
3.1 months
3-month recovery

Moderate

Moderate Risk
3.0 months
6-month recovery

Severe

Critical
2.9 months
12-month recovery
Adequate
Moderate Risk
Critical
Funding Gap Analysis
Your path to a 6-month emergency fund
Current Coverage
3.2
of 6 month target
Funding Gap
£7,000
53% funded
Monthly Top-Up Required
£583
for 12 months to reach target
Milestone Checkpoints
Month 3
£1,750
Month 6
£3,500
Month 9
£5,250
Month 12
£7,000

All calculations are performed locally. Your financial data never leaves your device.

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Emergency Fund Runway Simulator Guide

Model baseline and stress scenarios to understand how quickly your emergency fund could deplete and what top-up plan closes the gap.

📅 Last updated: 2026-03-09

Quick Tips

Jump-start your understanding with these essential tips

Step-by-Step Guide

Follow these steps to get the most from this tool

Enter current cash buffer, monthly essentials, debt minimums, and monthly income. Then set your target runway in months.

💡 Pro Tips:

  • •Use after-tax income values.
  • •Keep debt minimums separate from optional spending.

Advanced Topics

Deep dives for advanced users

📚Read More Articles

Discover helpful guides and insights

Frequently Asked Questions

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