📖 Overview
Use this calculator to plan future cash needs under inflation pressure.
🧪 Example Scenarios
Use these default and higher-pressure example inputs to explore how sensitive this calculator is before using your real numbers.
| Input | Base Case | Higher Pressure Case |
|---|---|---|
| Current Cost ($) | 45,000 | 54,000 |
| Annual Inflation Rate (%) | 3.2 | 3.84 |
| Years In Future | 12 | 13.8 |
⚙️ How It Works
This projects future purchasing cost by compounding current cost with annual inflation across time.
The Formula
Future Cost = Current Cost × (1 + Inflation Rate ÷ 100)ⁿ
| Future Cost | What the same purchase will cost in the future |
| Current Cost | Today's price or value |
| Inflation Rate | Expected annual inflation as a percentage |
| n | Number of years |
💡At 3% annual inflation, prices double in ~24 years. This matters for retirement planning — a $50,000/year lifestyle today may require $90,000+ in 20 years.
Quick Reference
| Current Cost | 2% / 10yr | 3% / 10yr | 4% / 20yr | 5% / 20yr |
|---|---|---|---|---|
| $10,000 | $12,190 | $13,440 | $21,910 | $26,530 |
| $50,000 | $60,950 | $67,196 | $109,556 | $132,665 |
| $100,000 | $121,899 | $134,392 | $219,112 | $265,330 |
When To Use This
- Use this tool when you need a fast decision during active planning or execution.
- Use this before committing money, time, or tradeoffs that are hard to reverse.
- Use this to compare options using the same assumptions across scenarios.
Edge Cases To Watch
- Results can be misleading if key inputs are missing, stale, or unrealistic.
- Very small or very large values may amplify rounding effects and interpretation risk.
- If assumptions change mid-decision, recalculate before acting.
Practical Tips
💡 Use realistic long-term inflation assumptions.
💡 Run low, base, and high inflation scenarios.
💡 Run a best-case, base-case, and worst-case scenario before deciding.
💡 Use recent real values, not ideal assumptions, for better accuracy.
Frequently Asked Questions
❓ Why does inflation matter so much long term?
Compounding price growth can significantly change required future cash.
❓ Is CPI the only reference?
No, category-specific inflation may differ from headline CPI.