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Compound Interest, FIRE & Loan Amortization

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Visualize long-term compound investment growth adjusted for inflation, calculate your Lean/Standard/Fat FIRE target and retirement age, and generate monthly mortgage/loan amortization tables with extra payment savings and CSV export.

100% In-Browser No Server Storage Instant Results
Final Balance
$207,242
Interest Earned
$107,242
Total Principal
$100,000
Today's Dollars
$143,093
Growth Trajectory by Year
YearStartInterestEnd BalanceReal Value
1$10,000+$1,096$17,096$16,679
2$17,096+$1,685$24,782$23,588
3$24,782+$2,323$33,105$30,742
4$33,105+$3,014$42,119$38,158
5$42,119+$3,762$51,882$45,856
6$51,882+$4,573$62,454$53,854
7$62,454+$5,450$73,905$62,173
8$73,905+$6,401$86,305$70,835
9$86,305+$7,430$99,735$79,861
10$99,735+$8,544$114,279$89,275
11$114,279+$9,752$130,031$99,102
12$130,031+$11,059$147,090$109,369
13$147,090+$12,475$165,565$120,104
14$165,565+$14,008$185,573$131,335
15$185,573+$15,669$207,242$143,093

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How It Works Under the Hood

Runs exact period-by-period financial compounding, monthly investment recurrence solving for Safe Withdrawal Rate independence, and month-by-month principal/interest amortization comparisons.

Step-by-Step Instructions

1

Choose Compound Interest, FIRE Independence, or Loan Amortization.

2

Adjust principal, monthly contribution/extra payment, interest rate, inflation, or SWR.

3

Inspect year-by-year charts/tables and click Export Schedule CSV for Excel or budgeting.

Key Features & Performance

  • Inflation-Adjusted Purchasing Power: Shows real future value alongside nominal compound growth
  • Lean, Standard & Fat FIRE Benchmarks: Calculates exact portfolio targets using your SWR %
  • Extra Payment Loan Simulator: Quantifies exact interest dollars and years shaved off mortgages
  • Instant CSV Schedule Download: Export full yearly/monthly tables cleanly

Local Browser Processing & Privacy

Traditional web converters upload your documents, snippets, or media files to remote servers. Compound Interest, FIRE & Loan Amortization runs inside your browser tab:

Processed in This Tab

Your input text and files are processed locally without uploading payloads to a processing server.

No Tool Payload Logging

Microdeck does not log or store the files or inputs you paste into tool workspaces (normal static hosting/CDN requests still load page assets).

Tab Memory Lifecycle

Working outputs stay in your browser tab and are released when you reset the tool or close the tab.

Frequently Asked Questions

What is the 4% rule in the FIRE Independence tab?

Derived from the Trinity Study, multiplying annual living expenses by 25 (4% Safe Withdrawal Rate) estimates the portfolio size needed to fund expenses sustainably.

How does extra monthly principal reduce loan interest so dramatically?

Every extra dollar paid goes 100% directly toward reducing remaining principal, shrinking the interest calculated across all future months.

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